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  • Chemistry  (2,664)
  • Inorganic Chemistry  (621)
  • Fluid Mechanics and Thermodynamics  (11)
  • Aircraft Propulsion and Power
  • 1955-1959  (2,681)
  • 1950-1954
  • 1958  (2,681)
Collection
Publisher
Years
  • 1955-1959  (2,681)
  • 1950-1954
Year
  • 1
    Publication Date: 2019-06-28
    Description: Charts have been prepared relating the thermodynamic properties of air in chemical equilibrium for temperatures to 15,000 degrees k and for pressures 10(-5) to 10 (plus 4) atmospheres. Also included are charts showing the composition of air, the isentropic exponent, and the speed of sound. These charts are based on thermodynamic data calculated by the National Bureau of Standards.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TN-4265
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  • 2
    Publication Date: 2019-06-28
    Description: Average spanwise blade temperatures and cooling-air pressure losses through a small (1.4-in, span, 0.7-in, chord) air-cooled turbine blade were calculated and are compared with experimental nonrotating cascade data. Two methods of calculating the blade spanwise metal temperature distributions are presented. The method which considered the effect of the length-to-diameter ratio of the coolant passage on the blade-to-coolant heat-transfer coefficient and assumed constant coolant properties based on the coolant bulk temperature gave the best agreement with experimental data. The agreement obtained was within 3 percent at the midspan and tip regions of the blade. At the root region of the blade, the agreement was within 3 percent for coolant flows within the turbulent flow regime and within 10 percent for coolant flows in the laminar regime. The calculated and measured cooling-air pressure losses through the blade agreed within 5 percent. Calculated spanwise blade temperatures for assumed turboprop engine operating conditions of 2000 F turbine-inlet gas temperature and flight conditions of 300 knots at a 30,000-foot altitude agreed well with those obtained by the extrapolation of correlated experimental data of a static cascade investigation of these blades.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E58E20
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  • 3
    Publication Date: 2019-05-25
    Description: No abstract available
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E58D11 , AD-162732
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  • 4
    Publication Date: 2019-06-27
    Description: Two short turbojet combustors designed for use with vaporized hydrocarbon fuels were tested in a one-quarter annular duct. The experimental combustors consisted of many small "swirl-can" combustor elements manifolded together. This design approach allowed the secondary mixing zone to be considerably reduced over that of conventional combustors. The over-all combustion lengths, for the two configurations were 13.5 and 11.0 inches, approximately one-half the length of the shortest conventional combustors. These short combustors did not provide combustion efficiencies as high as those for conventional combustors at low pressures. However, over the range of combustor-inlet total-pressures expected in aircraft capable of flight at Mach numbers of 2.5 and above, these short combustors gave very high efficiencies. A combustion efficiency of 97 percent was obtained at a combustor-inlet total-pressure of 25.0 inches of mercury absolute, reference velocity of 120 feet per second, and inlet-air total temperature of 1160 deg R. By proportioning the fuel flow between the manifold rows of can combustor elements, control of the combustor-outlet radial total-temperature profile was demonstrated. Combustor totalpressure loss varied from 0.75 percent of the inlet total pressure at isothermal conditions and a reference velocity of 75 feet per second to 5.5 percent at a total-temperature ratio of 1.8 and a reference velocity of 180 feet per second.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E57J03
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  • 5
    Publication Date: 2019-06-27
    Description: This analysis investigates the application of gas turbine engines at a cruise Mach number of 4.
    Keywords: Aircraft Propulsion and Power
    Type: NASA-TM-X-60935 , NACA-C-8548
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  • 6
    Publication Date: 2019-08-16
    Description: Convection is called free is the stresses (including the normal pressure) to which the fluid is subjected at its boundaries do not perform mechanical work, that is, if all the boundaries of the fluid are stationary. The case where this is not true is termed forced convection. It corresponds to the action on the fluid of some mechanical suction pumping the fluid.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1407 , Rept-4281
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  • 7
    Publication Date: 2019-07-11
    Description: A program was conducted in an altitude facility at the NACA Lewis laboratory to investigate the effects of rapid inlet pressure oscillations on the operation of a current turbo jet engine. These pressure oscillations were approximately sinusoidal in form and were generated to cover a frequency range of 2 to 75 cycles per second and an amplitude range of 10 to 70 percent of the free-stream total pressure. As the oscillation progressed through the compressor, the amplitude was attenuated considerably and a relatively large phase shift (lag) occurred. Engine stall limits obtained during pressure oscillations differed from quasi-steady-state stall limits as defined by over-all compressor pressure ratio.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E58A03
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  • 8
    Publication Date: 2019-08-17
    Description: The method of coordinate perturbation is applied to the unsteady flow of a compressible fluid in ducts of variable cross section. Solutions, in the form of perturbation series, are obtained for unsteady flows in ducts for which the logarithmic derivative of area variation with respect to the space coordinate is a function of the 'smallness' parameter of the perturbation series. This technique is applied to the problem of the interaction of a disturbance and a shock wave in a diffuser flow. It is found that, for a special choice of the function describing the disturbance, the path of the shock wave can be expressed in closed form to first order. The method is then applied to the determination of the flow field behind a shock wave moving on a prescribed path in the x,t-plane. Perturbation series solutions for quite general paths are developed. The perturbation series solutions are compared with the more exact solutions obtained by the application of the method of characteristics. The approximate solutions are shown to be in reasonably accurate agreement with the solutions obtained by the method of characteristics.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1439
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  • 9
    Publication Date: 2019-08-16
    Description: A lightweight turbine rotor assembly was devised, and components were evaluated in a full-scale jet engine. Thin sheet-metal airfoils were brazed to radial fingers that were an integral part of a number of thin disks composing the turbine rotor. Passages were provided between the disks and in the blades for air cooling. The computed weight of the assembly was 50 percent less than that of a similar turbine of normal construction used in a conventional turbojet engine. Two configurations of sheet-metal test blades simulating the manner of attachment were fabricated and tested in a turbojet engine at rated speed and temperature. After 8-1/2 hours of operation pieces broke loose from the tip sections of the better blades. Severe cracking produced by vibration was determined as the cause of failure. Several methods of overcoming the vibration problem are suggested.
    Keywords: Aircraft Propulsion and Power
    Type: NASA-MEMO-10-5-58E
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  • 10
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    In:  CASI
    Publication Date: 2019-08-13
    Description: Upon impact of a solid body on the plane surface of a fluid, there occurs on the vetted surface of the body an abrupt pressure rise which propagates into both media with the speed of sound. Below, we assume the case where the speed of propagation of sound in the body which falls on the surface of the fluid may be regarded as infinitely large in comparison with the speed of propagation of sound in the fluid; that is, we shall assume that the falling body is absolutely rigid. IN this case, the entire relative speed of the motion which takes place at the beginning of the impact is absorbed by the fluid. The hydrodynamic pressures arising thereby are propagated from the contact surface within the fluid with the speed of sound in the form of compression and expansion waves and are gradually damped. After this, they are dispersed like impact pressures, reach ever larger regions of the fluid remote fran the body and became equal to zero; in the fluid there remain hydrodynamic pressures corresponding to the motion of the body after the impact. Neglecting the forces of viscosity and taking into account, furthermore, that the motion of the fluid begins from a state of rest, according to Thomson's theorem, we may consider the motion of an ideal compressible fluid in the process of impact to be potential. We examine the case of impact upon the surface of a ccmpressible fluid of a flat plate of infinite extent or of a body, the immersed part of the surface of which may be called approximately flat. In this report we discuss the first phase of the impact pressure on the surface of a fluid, prior to the appearance of a cavity, since at this stage the hydrodynamic pressures reach their maximum values. Observations, after the fall of the bodies on the surface of the fluid, show that the free surface of the fluid at this stage is almost completely at rest if one does not take into account the small rise in the neighborhood of the boundaries of the impact surface.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1413 , Prikadnaia Matematika i Mekhanika; 20; 1; 67-72
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  • 11
    Publication Date: 2019-08-15
    Description: Advantage of the elliptic functions and of the more general functions of Schwarz for fluid mechanics. Flows outside and inside polygons. Application to the calculation of an elbow diffuser for a wind tunnel. Properties of the elliptic integrals of the first kind and of the elliptic functions. Properties of the theta functions and decomposition of the elliptic functions into products of theta functions. Properties of the zeta functions. Decomposition of the elliptic functions into sums of zeta functions and calculations of the elliptic integrals. Applications to the calculation of wing profiles, of compressor profiles, and to the study of the vibrations of airplane wings and of compressor vanes. The manuscript of the present paper was checked by Mr. Eichelbrenner who corrected several imperfections and suggested numerous improvements to make reading of the paper easier. However, the limited subject does not permit filling in more than an incomplete knowledge of the properties of analytic functions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1435 , Les Fonctions et Integrales Elliptiques a Module Reel en Mecanique des Fluids; ONERA-P-71
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  • 12
    Publication Date: 2019-08-15
    Description: The increasing importance of high-speed flow leads to similar problems in various fields of research which are summarized in what follows. Typical of all cases is the conversion of high kinetic energy into extreme thermodynamic states with temperatures of several thousand degrees, frequently connected with dissociation and ionization of the gas involved. There is also a characteristic small sensitivity to the processes discussed in the case of gases of low molecular weight (light gases). The penetration of meteors into the atmosphere of the earth at astronomical speeds results in temperatures higher than those of the surface of the sun. Such temperatures may be produced in shock tubes, with light gases used as the driving gas. For supersonic fighters the problem of propulsion is less difficult to solve than the problem of large heating, on the surface and in the combustion chamber. Finally, for the space-travel rocket, astronomical speeds have to be reached which require the lightest possible gases as propellants. Here again, dissociation processes in the combustion chamber are of considerable importance.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1434 , Zeitschrift fuer Flugwissenschaften; 4; 4-Mar; 95-108
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  • 13
    Publication Date: 2019-07-11
    Description: Ideally, the reflection of a shock from the closed end of a shock tube provides, for laboratory study, a quantity of stationary gas at extremely high temperature. Because of the action of viscosity, however, the flow in the real case is not one-dimensional, and a boundary layer grows in the fluid following the initial shock wave. In this paper simplifying assumptions are made to allow an analysis of the interaction of the shock reflected from the closed end with the boundary layer of the initial shock afterflow. The analysis predicts that interactions of several different types will exist in different ranges of initial shock Mach number. It is shown that the cooling effect of the wall on the afterflow boundary layer accounts for the change in interaction type. An experiment is carried out which verifies the existence of the several interaction regions and shows that they are satisfactorily predicted by the theory. Along with these results, sufficient information is obtained from the experiments to make possible a model for the interaction in the most complicated case. This model is further verified by measurements made during the experiment. The case of interaction with a turbulent boundary layer is also considered. Identifying the type of interaction with the state of turbulence of the interacting boundary layer allows for an estimate of the state of turbulence of the boundary layer based on an experimental investigation of the type of interaction. A method is proposed whereby the effect of the boundary-layer interaction on the strength of the reflected shock may be calculated. The calculation indicates that the reflected shock is rapidly attenuated for a short distance after reflection, and this result compares favorably with available experimental results.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1418
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  • 14
    Publication Date: 2019-07-12
    Description: The performance and operational characteristics of two afterburner configurations for the Iroquois turbojet engine were evaluated in an altitude test chamber over a range of afterburner equivalence ratios at afterburner-inlet pressures from 733 to 3186 pounds per square foot absolute. These conditions correspond to an altitude range from 38,700 to 66,800 feet at a flight Mach number of 1.5. The only difference between the two afterburner configurations was in the pattern of afterburner fuel injection. At an afterburner-inlet pressure of approximately 3100 pounds per square foot absolute, corresponding to an altitude of 38,700 feet and a_ flight Mach number of 1.5, the combustion efficiency of both configurations reached peak values of 0.80 to 0.85 at equivalence ratios of 0.35 to 0.40. However, further reduction in the afterburner-inlet pressure severely affected combustion efficiency. For example, at an afterburner inlet pressure level of 700 to 1000 pounds per square foot absolute, the efficiency for both configurations was 0.20 to 0.40.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE58G01
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  • 15
    Publication Date: 2019-08-15
    Description: In reading the publications on turbulence of different authors, one often runs the risk of confusing the various correlation coefficients and turbulence spectra. We have made a point of defining, by appropriate concepts, the differences which exist between these functions. Besides, we introduce in the symbols a few new characteristics of turbulence. In the first chapter, we study some relations between the correlation coefficients and the different turbulence spectra. Certain relations are given by means of demonstrations which could be called intuitive rather than mathematical. In this way we demonstrate that the correlation coefficients between the simultaneous turbulent velocities at two points are identical, whether studied in Lagrange's or in Euler's systems. We then consider new spectra of turbulence, obtained by study of the simultaneous velocities along a straight line of given direction. We determine some relations between these spectra and the correlation coefficients. Examining the relation between the spectrum of the turbulence measured at a fixed point and the longitudinal-correlation curve given by G. I. Taylor, we find that this equation is exact only when the coefficient is very small.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1436 , ONERA; 34
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  • 16
    Publication Date: 2019-08-15
    Description: A number of semiempirical approximate methods exist for determining the characteristics of the turbulent boundary layer on a curvilinear surface. At present, among these methods, the one proposed by L. G. Loitsianskii is given frequent practical application. This method is sufficiently effective and permits, in the case of wing profiles with technically smooth surfaces, calculating the basic characteristics of the boundary layer and the values of the overall drag with an accuracy which suffices for practical purposes. The idea of making use of the basic integral momentum equation ((d delta(sup xx))/dx) + ((V' delta(sup xx))/V) (2 + H) = (tau(sub 0))/(rho V(exp 2)) proves to be fruitful also for the solution of the problems in the determination of the characteristics of the turbulent boundary layer on a rough surface.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1440 , Izvestiia Akademii Nauk SSR, Otdelenie Teknicheskikh Nauk; 8; 17-21
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  • 17
    Publication Date: 2019-08-15
    Description: The effect of the location of transition on the heat transfer to the turbulent incompressible boundary layer is analyzed. The analysis indicates that considerably higher heat-transfer rates may occur for some distance downstream if the transition is very late. The results of a limited experimental investigation are in substantial agreement with the results of the analysis. If the extent of the transition region is known, the analysis also allows adequate prediction of heat-transfer coefficients within the transition region. The nature of this analysis is such that it should predict local shear coefficients in the transition region equally well.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-MEMO-12-4-58W
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  • 18
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Comparing Exposure Tests on the Corrosion Resistance of Passivated Galvanic zinc coatingsThe results of three years exposure tests on galvanic zinc coatings passivated by 15 different methods are given. The experiments were carried out under different conditions of climate: industry, urban, country and sea climate.There were big differences between the differently passivated coatings though generally a considerable increase of the corrosion resistance could be observed. The most effectfully passivating methods are named. Further result is that there is no good agreement between exposure and accelerated tests. The results show that the most intensive corrosion takes place in industrial climate and decreases in the order urban sea and country climate. It should be mentioned that fairly no dust will be deposited on some chromate coatings. Some coatings remained glittering for longer times, open, till the basic metal was corroded. A comparison of the resistances to corrosion of the differently passivated zinc coatings is given.
    Notes: Die Ergebnisse dreijähriger Feldversuche von galvanischen Zinküberzügen, die nach fünfzehn verschiedenen Verfahren passiviert worden waren, wurden bekanntgegeben. Die Versuche wurden unter verschiedenen Klimaverhältnissen: Industrie-, Stadt-, Land- und Seeklima, durchgeführt.Es wurde festgestellt, daß zwischen den in verschiedenen Bädern passiovierten Überzügen große Unterschiede bestehen in Bezug auf die Korrosionsbeständigkeit. In den meisten Fällen wurde eine bedeutende Verbesserung der Korrosions-beständigkeit beobachtet. Die Passivierungsbäder, welche die Korrosionsbeständigkeit der Zinküberzüge besonders steigern, wurden angegeben. Allgemein wurde festgestellt, daß nur ein loser Zusammenhang zwischen den Ergebnissen der Feld und Schnellversuche besteht. Die Ergebnisse zeigen, daß bei den passivierten Zinküberzügen die stärkste Korrosion im Industrieklima eintritt und dann in der Reihenfolge Stadt-, See-, und Landklima abnimmt. Man bemerkte auch, daß sich auf einigen Chromatüberzügen kaum Schmutz niederschlägt. Manche der Überzüge behielten ihren Glanz längere Zeit, oft bis zum Auftreten der Korrosion des Grundmetalls. Ein Vergleich der Korrosionsbeständigkeit der in verschiedenen Bädern passivierten Zinküberzügen wurde angegeben.
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  • 19
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Electro Chemical Behavior of Bimetallic Electrodes and the Application of their Overpotential Curves in Corrosion ResearchA two phase electrode with local cells on its anodic and cathodic surfaces is put into an extern circuit. The polarization voltage depends on (a)the situation and size of the local cell surfaces,(b)the anodic and cathodic processes on the local electrodes,(c)the direction and the current density of the extern current and(d)the situation of the tip of the reference electrode in the solution.The facts nzcntioned above are the basis for an investigation of current doisity-voltage curves of electrodes which are corroded by local currents.
    Notes: Eine Zweiphasenelektrode mit Lokal-elementanbildung auf ihren Anoden-und Kathodenflächen wird in einem äußeren Stromkreis eingebaut; die Messung der Polarisationsspannung hängt ab von: (a)Lage und Größe der Lokalelementflächen(b)Anoden- und Kathodenvorgängen auf den Lokalelektroden(c)Richtung und Stärke des außen angelegten Stromes und(d)Lage des Abzapfpunktes der Bezugselektrode in der Lösung.Die Erörterung der Tatsachen bildet die Grundlage zur Untersuchung von Strom. Spannungskurven von Elektroden, die bei Korrosionsvorgängen durch Lokalströme erhalten werden.
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  • 20
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 461-466 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 21
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 455-460 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 22
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 443-450 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion of Steel Pipes in Refinary Equipment by Sulfur Rich Crude OilThe crude oil of Nagylengyel contains five and six membered naphtene rings which are fused partly and heterocyclic compounds with sulfur, nitrogen resp. vanadium. The products of thermal decomposition of the crude oil and the overheated water vapor which is added to lower the partial pressure of the oil vapor attack the iron parts of the refinery severely. According to chemical and x-ray investigations the corrosion processes cause the formation of metal sulfides and sulfates as well as oxides of various degrees of oxidation. The corrosion products show differing structures according to the duration of corrosion. After some months there arc several plain covers of rust. After two years a peculiar structure of several layers appears which looks like finger prints. Under the cover the basic metal seems to be ribbed as by etching.The form of this noteworthy corrosion may be discerned by diffusion effects.
    Notes: Das Rohöl von Nagylengyel enthält Verbindungen, in welchen  -  z. T. kondensierte  -  fünf- oder sechsgliedrige Naphthenringe, außerdem Ringe mit Schwefel-, Stickstoff- bzw. Vanadin-Heteroatomen vorkommen. Bei der Verarbeitung des Rohöles greifen die therm. Zersetzungsprodukte und der  -  zwecks Erniedringung des Partialdruckes der Öldämpfe  -  eingeführte überhitzte Wasserdampf die Eisenteile der Raffinationsanlage stark an. Die Korrosionsvorgänge führen  -  nach den Daten der chem. und röntgenograph. Analyse der Korrosionsprodukte  -  zur Bildung von Metallsulfid und -sulfat-Verbindungen, ferner Metalloxyden verschiedener Oxydationsstufen.Die äußere Form und die mikrosk. Untersuchung zeigt, abhängend von der Zeitdauer der Korrosionswirkung, unterschiedliche Struktur. Bei paar Mon. Einwirkungsdauer sind mehrere glatte Rostschichten zu finden. Nach 2 Jhr. erscheint eine eigenartige „Fingerabdruck“ ähnliche, mehrschichtige Struktur. Unter dem gerippten Überzug scheint auch das Grundmetall durch Einätzung und Rippen unterteilt zu sein.Das Zustandekommen der bemerkenswerten Korrosionsformen kann mit Diffusionseffekten in Zusammenhang gebracht werden.
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  • 23
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 467-470 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 24
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 475-480 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 25
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 481-487 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 26
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 471-474 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 27
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 487-487 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 28
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 487-487 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 29
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 30
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 31
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 488-488 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 488-488 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 491-491 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 488-491 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 491-492 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. XXI 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958) 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 613-623 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Investigations on the Corrosion of Pressure Pipes and on the Protective MeasuresThe article presents a discussion of the general principles of galvanic cells as they cause many initial corrosion processes. This allows to understand easily the formation of rust on pipes in tunnels.The author gives a short summery of the behavior of different metal parts of a pipeline in a gallery under the influence of percolating water as well as of constant modifications of the conditions of temperature and airation.Furthermore some protective measures are described which were found to be suitable. Finally the properties of a protective coating which consists of several covers of paint, requested to guarrantee durable protection, are discussed.
    Notes: In vorliegendem Beitrag werden einige allgemeine Grundsätze der Bildung galvanischer Elemente betrachtet, da solche Elemente den Ausgangspunkt der Korrosionserscheinung darstellen; dadurch wird auch die Bildung des Rostes auf metallischen Leitungen in unterirdischen Schächten leichter verständlich.Der Verfasser gibt danach eine kurze Zusammenfassung des Verhaltens der verschiedenen metallischen Bestandteile einer in einer Galerie laufenden Leitung unter dem Einfluß von Sickerwasser sowie ständigem Wechsel der Temperatur und der Belüftung.Außerdem werden die Schutzmaßnahmen beschrieben, die zur Bekämpfung der schädlichen Einflüsse einer feuchtigkeitsgesättigten Atmosphäre erprobt wurden. Abschließend werden die wesentlichen Eigenschaften behandelt, die ein aus mehreren Anstrichschichten bestehender Überzug besitzen muß, um dauerhaften Schutz zu gewähren.
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    ISSN: 0947-5117
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    Description / Table of Contents: On the Importance of the Physical Properties of the Soil in Regard to the Mechanisms of the Reactions of Iron in SoilsAmong various factors controlling the velocity of the corrosion of iron in soils, as there are the soil water, the soil air, the pH-value and the electric resistance of the soil, the adhesive power of the soil to water is the most important one. The active and Passive states of iron in soil can be discerned from the theories of soil physicsBy means of model tests with glass balls of different sizes all kinds of contact corrosion can be explained. In a system unsaturated with water pitting might take place. A more uniform and weaker erosion is noticed in saturated soils.Basing on these results the experimental results of the American Bureau of Standards on the velocity of the corrosion of iron in 47 soils in the USA are represented as dependant of the average annual amount of rain.
    Notes: Unter den verschiedenen Faktoren, welche die Korrosionsgeschwindigkeit des Eisens im Erdreich regulieren, wie z. B. Bodenwasser, Bodenluft, Wasserstoffionen-Konzentration und Erdbodenwiderstand, ist das Haflvermögen des Bodens an Wasser der wichtigste Faktor. Das aktive und passive Verhalten des Eisens im Erdreich kann mit den Grundlagen der Bodenphysik erklärt werden.An Hand von Modellversuchen mit Glaskugeln verschiedener Größe werden die möglichen Arten der Kontaktkorrosion erklärt, in einem an Wasser ungesättigten System kommt es zu Lochfraß, und in einem an Wasser gesättigten Boden wird Eisen weniger und gleichmäßiger abgetragen.Auf Grund dieser Ergebnisse wurde versucht, die in der Natur erhaltenen Versuchsergebnisse des amerikanischen Bureau of Standards über die Korrosionsgeschwindigkeit des Eisens in 47 USA-Böden in Abhängigkeit von der durchschnittlichen jährlichen Regenmenge darzustellen.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 630-636 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Corrosion of the Tin Plate Container in Canning IndustryA large number of variables (steel, tin coating, surface treatments, can, content) play a role in the corrosion of the tin plate cans; thence its many aspects. The author treats deals special effects of corrosion on the inside and the outside of cans such as sulfide staining briefly. The usual effects of corrosion are discussed in detail: they are characterised by the tin-iron couple, in which tin is the anode (in unlacquered cans). The thickness and the porosity of the tin coating play a minor role while the type and characteristics of the steel, the presence of cathodic de-polarizers (like atmospheric oxygen), and the storage temperature, are important factors Lacquering increases corrosion by reducing the surface of the protective anode.The time dependance of the potentials of tin and steel in a couple, and of the output of the cell, seem to be the best means of studying the influences of the various factors; the most recent research is in this direction. So far, however, no laboratory test can replace practical tests.
    Notes: Zahlreiche Variabeln (Stahl, Verzinnung, Behandlung der Oberfläche, Dose, Produkt) beeinflussen die Korrosion der Konservendose; darum ist sie so verschiedenartig. Verfasser behandelt kurz die äußere Korrosion sowie bestimmte Typen von inneren Angriffen wie Sulfurierung, und bespricht eingehend die eigentliche Korrosion. Diese ist durch die Anwesenheit des Elektroelementes Zinn-Eisen charakterisiert, in welchem das Zinn als Anode wirkt (unlackierte Dose). Dicke und Porosität der Verzinnung spielen eine untergeordnete Rolle; dagegen sind Typ und Eigenschaften des Stahls, Anwesenheit von Depolarisatorer der Kathode (u. d. Luftsauerstoff) und Lagertemperatur wichtige Faktoren. Die Lackierung beschleunigt die Korrosion, da sie die Oberfläche der schützenden Anode vermindert.Die zeitliche Änderung des Potentials von Zinn und Stahl, in elektricher Berührung und der Strommenge der Zelle, scheinen der beste Weg zu sein, um den Einfluß der verschiedenen Faktoren zu untersuchen; in dieser Richtung bewegen sich die allerletzten Studien; doch bis jetzt erlaubt kein Laboratoriumversuch die praktische Probe zu ersetzen.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 645-650 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: On the Importance of the Hydrate of Lime in Cement Mortar an Concrete against Aggression and of its Resistant Setting by Chemical Reactions during Hydration1The evaluation and interpretation of analytic and physical long term experiments with concretes made of Portland and blast furnace cements which were stored in aggressive agents, shows that the results agree to the theory of cements of the author. On this basis the hydration and cementation processes in the mortar beds as well as the causes and the mechanism of the corrosion of concrete are discerned. As the results of several testing methods and of different evaluation principles are agreeing, theoretically, the experimental results are of general and principle importance.2By means of a chemical reation a resistant setting of the hydrate of lime in the liquid phase during hydration was made possible. The so caused inhibition of the primary aggression allowed to increase the resistance of concretes of standard cements to a level never achieved before.
    Notes: 1Durch die Auswertung und Deutung von Langzeitversuchen, analytischen und physikalischen Untersuchungsergebnissen mit Beton aus Portlandzement und Hochofenzement bei Lagerung in aggressiven Medien ist es gelungen, einc neue zementtheoretische Anschauung des Verfassers zu bestätigen und davon ausgehend zur Klärung der Hydratations- und Erhärtungsvorgänge im Mörtelbett sowohl als auch der Ursachen und des Verlaufs der Betonaggression beizutragen. Die Untersuchungsergebnisse sind im Himblick auf ihre Übereinstimmung nach verschiedenen Prüfmethoden und den verschiedensten Auswertungsunterlagen nach Herstellungsart und Durchführungszeit theoretisch von allgemeingültiger und grundsätzlicher Bedeutung.2Durch die aggressionsbeständige Bindung des Kalkhydrats des Zements in der flüssigen Phase durch eine gezielte chemische Umsetzung während der Hydratation und die dadurch verursachte Hemmung bzw. Stillegung der Primäraggression wurde es möglich, Beton aus Normenzementen auf einfache Weise eine Aggressionsbeständigkeit zu geben, wie sie bisher noch nicht erreicht werden konnte.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 651-657 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 658-664 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 665-668 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 669-670 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 671-676 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 677-677 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 679-680 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 680-680 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. XXXIII 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 680-680 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958) 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 681-686 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Documentation and Protection against Corrosion by PaintsThe protection against corrosion by painsts plays an important part in the range of protective methode available.Modern paints differ considerably from those used thirty or even ten years ago.Successive developments require continuous testing. The recording and evaluation of the results of short-term tests in the laboratory, of weathering tests and practical applications are usually unsatisfactory.A significant documentation would enable a successful comparison and interpretation of results to be given. Thus, some directions on how to prepare a documentation are given.Besides the standard DIN 53210 “Determination of the Degree of Rusting” there is a draft on the determination of the quality of a paint coat. Results are collected in card index files.
    Notes: Der Korrosionsschutz durch Anstriche nimmt bei den zur Verfügung stehenden Schutzverfahren einen breiten Raum ein. Die heute verwendeten Anstrichmittel unterscheiden sich erheblich von denen, die man vor 30 Jahren benutzt hat und selbst von denen, die vor 10 Jahren in Gebrauch waren.Diese ständige Weiterentwicklung erfordert eine fortlaufende Erprobung. Die Erfassung und Auswertung von Ergebnissen bei Kurzprüfungen im Labor, Bewitterungsprüfungen und bei der Anwendung in der Praxis, ist in der Regel unbefriedigend. Aber erst durch eine sinnvolle Dokumentation der Prüfergebnisse können diese mit einander verglichen und ausgewertet werden.Nachfolgend werden Wege aufgezeigt, wie dieses erfolgen kann. Neben der DIN 53210 „Bestimmung des Rostgrades“ wird ein Schema zur Beurteilung des Zustandes des Anstriches mitgeteilt. Die Ergebnisse werden in Karteikarten erfaßt.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 690-693 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Application of Electro-Chemical Measurements to Find the Causes of CorrosionElectro-chemical investigations of materials under operating conditions enable the causes of corrosion damage to be ascertained.Current density voltage curves plotted on half logarithmic paper give information on the kind and the amount of the corrosion currents. There cases which could be cleared up by electro-chemical investigations are discussed.In the first case, the results show that the sensitivity of a steel section depends much more on its chemical composition than on peripheral segregation.The second case demonstrates that technical phosphoric acid weakens the passivation of V4A steel and conditions potentials at which pitting might occur if the surface is not clean.Finally the influence of atmospheric oxygen upon the corrosion current is discussed in the light of electro-chemical investigations. Intakes of air at a leaky stuffing box are considered to have caused the corrosion of a centrifugal pump.
    Notes: Eiektrochemische Messungen an Werkstoffen, die den jeweiligen Betriebsverhältnissen angeglichen werden, können oft zu wesentlichen Aussagen über die Ursachen von Korrosionsschadensfällen führen.In halblogarithmischer Darstellung aufgenommene Stromdichte-Potentialkurven sind direkten Aussagen über die Art und Größe von Korrosionsströmen zugänglich. In drei Beispielen werden die Ergebnisse von elktrochemischen Messungen diskutiert, die zur Klärung von Korrosionsschäden führten.In einem Fall geben die Versuchsergebinsse an, daß die Korrosionsanfälligkeit eines Profilstables stärker von der chemischen Zusammensetzung, als von randnaben Seigerungen bestimmt wird.Im zweiten Beispiel wird aufgezeigt, daß technische Phosphorsäure die Passivierung von V4A-Stahl abschwächt und Ruhepotentiale erreicht werden, die bei nicht sauberen Oberflächen zu Lochfraß führen können.Aus den Versuchsergebnissen elektrochemischer Messungen an Gußbronze in Kühlsole wird drittens der Einfluß von Lufltsauerstoff auf den Korrosionsstrom angeführt, so daß Lufteintritt an einer undichten Stoffbüchse für die starke Korrosion einer Kreiselpumpe verantwortlich gemacht werden muß.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 686-689 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Glossy and Thick Rhodium CoatingsRhodium has been used for twenty years to prevent the tarnishing of silver goods and silver jewellery. Today, Rhodium finds its applications in engineering too. The 'decorative' coatings are glossy but only 1 micron thick. The 'technological' coatings of thicknesses varying between 2 and 25 microns, are always dull.However, for certain purposes it is desirable to obtain both thick and glossy Rhodium coatings. The author, therefore, examines the effects of various additives: cetain metal salts delay the disappearance of the gloss with a coating thickness of up to 2 microns, but the true gloss-producing agents appear to be active only on the surface. A number of such surfaceactive materials (anion-active, cathion-active and non-ionising) were investigated. Some of these produce glossy coatings with a thickness of far more than 10 microns. In addition, the porosity of the coat and its surface tesion is greatly reduced, the porosity of the coat and its surface tension is greatly reduced and thereby the corrosion resistance of the Rhodium is significantly improved. However, results of these experiments are not entirely consistent and work in this field continues.
    Notes: Rhodium wird seit über zwei Jahrzehnten angewandt, um das Anlaufen von Silberwaren und Silberschmuck zu verhüten. Heute hat Rhodium auch in der Technik Eingang gefunden. Die „dekorativen“ Schichten sind glänzend, jedoch nicht stärker als 1 Mikron; die „technischen“ Schichten, deren Dicke zwischen 2 und 25 Mikron schwankt, sind stets matt.Für gewisse Zwecke ist es jedoch erwünscht, dicke und glänzende Rhodiumüberzüge zu erhalten. Der Verfasser hat daher die Wirkung verschiedener Zusätze geprüft: Gewisse Metallsalze verzögern das Schwinden des Glanzes bei einer Schichtdicke bis zu zwei Mikron, jedoch scheinen die ausgesprochenen glanzgebenden Produkte oberflächenaktive Stoffe zu sein. Eine Reihe synthetischer oberflächenaktiver Produkte  -  anionaktive, kationaktive und nichtionogene  -  wurde untersucht. Einige davon ergeben glänzende Überzüge bei Schichtdicken, die weit über 10 Mikron liegen. Die Porosität der Schicht und ihre Oberflächenspannung werden außerdem stark herabgesetzt und dadurch wird die Korrosionsbeständigkeit des Rhodiums deutlich verbessert. Die erhaltenen Ergebnisse sind jedoch noch nicht durchweg konstant und die Arbeiten auf diesem Gebiet werden fortgesetzt.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 715-718 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 693-698 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Causes of Stress Corrosion Cracking in Non-ferrous Metals and SteelsThe basic problems of stress corrosion are, on the one hand, the extreme localisation of the attack on the grain boundaries or on areas within the crystals; on the other hand the effect to tensile strees. The assumption that the tensile stress causes the localisation of the attack is not borne out. It is shown that a localised attack on the intergranular boundaries takes place even in homogeneous solid solution, without any tensile stress. This is traced to the increased reactivity of obtuse-angled grain boundaries due to solid solution formation, which can be proved experimentally. This solid solution effect, however, with a maximum of 50 At does not cause intercrystalline i. e. stress corrosion under the action of chemically corrosive agents alone; but only if an electrochemical process takes place at the same time. It is shown that such a porcess is possible even is homogeneous solid solution. As regards the part played by tensile stress, it is shown that its effect consists only of producing plastic deformation for, in the course of such deformation, i. e: in statu deformandi, the activity of a solid solution is increased considerably; for this, too, experimental proofs are given.
    Notes: Die Grundprobleme der Spannungskorrosion sind einerseits die extreme Lokalisierung des Angriffs auf die Korngrenzen oder auch auf Bereiche innerhalb der Kristallite, andererseits die Wirkung der Zugspannung. Die Annahme, daß durch die Zugspannung die Lokalisierung des Angriffs verursacht werden würde, wurde nicht bestätigt. Es wird nachgewiesen, daß ein lokalisierter Angriff auf die Korngrenzen auch bei homogenen Mischkristallen schon ohne Vorhandensein von Zugspannungen erfolgt. Dies wird auf eine Erhöhung des Reaktionsvermögens der Großwinkel-Korngrenzen als Folge der Mischkristallbildung zurückgeführt, die experimentell nachgewiesen wird. Dieser “Mischkristall-Effekt” mit Maximum bei 50 At.-% führt jedoch bei Einwirkung chemischer Agentien allein noch nicht zu interkristalliner bzw. Spannungskorrosion, sondern nur bei gleichzeitigem Auftreten eines elektrochemischen Prozesses. Es wird gezeigt, daß ein solcher unter gewissen Voraussetzungen auch bei homogenen Mischkristallen möglich ist. Bezüglich der Rolle der Zugspannungen wird gezeigt, daß ihre Wirkung lediglich darin besteht, plastische Verformungen hervorzurufen, denn unmittelbar während einer plastischen Verformung, d. h. “in statu deformandi”, wird das Reaktionsvermögen von Mischkristallen ganz beträchtlich erhöht, wofür ebenfalls experimentelle Beweise erbracht werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 719-722 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 699-715 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Galvanic Corrosion of Cast Iron and Brass Ms 60 in Acids, in the Absence and Pressence of Inhibitors II.Experiments show that the galvanic corrosion process is largely independent of corrosion caused by local cells. Inhibitors suppress only the effect of the local cells. The amount of galvanic corrosion in acid solutions is usually less than 1% of the total corrosion. The proportion of galvanic corrosion is increased only by the addition in inhibitors, because the corrosion caused by local cells is then supressed much more than the galvanic corrosion. Mixtures of inhibitors give greater protection than single substances. The nature of the charge on the inhibitor ions has little influence, because inhibition occurs both at the anode and at the cathode of the galvanic couple irrespective of the charge on the inhibitor ions. The effects observed can be explained by the theory which postulates an insulating pin-cushion inhibitor film. The results again support the inhibitor theory of W. Machu.
    Notes: Versuche zeigten, daß die galvanische Korrosion weitgehend unabhängig von der durch Lokalelemente hervorgerufenen vor sich geht. Inhibitoren hemmen praktisch nur die Tätigkeit der Lokalelemente. Der Anteil der galvanischen Korrosion an der Gesamtkorrosion ist in Säuren nur gering, meist kleiner als 1%. Nur bei guter Hemmungswirkung steigt der prozentuale Anteil der galvanischen Korrosion an, da die Korrosion durch Lokalelemente durch die Inhibitoren stärker verringert wird als die nur wenig verringerte galvanische Korrosion. Gemische von Inhibitoren schützen besser als Einzelstoffe. Der Ladungssinn der Inhibitorteilchen hat nur wenig Einfluß, da unabhängig vom Ladungssinn des Inhibitorteilchens Hemmungswirkungen sowohl an der Kathode als auch an der Anode der Metallkombination auftreten. Als Erklärung der beobachteten Erscheinungen wird die nadelkissenartige, isolierend wirkende Deckschicht der Inhibitoren herangezogen. Die Versuche stellen eine erneute Bestätigung der Inhibitortheorie von W. Machu dar.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 723-727 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 727-728 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 729-730 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 731-731 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 731-733 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 733-735 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 735-736 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 736-736 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958) 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. XXXVI 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 741-746 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Experiences with Amine Cured Epoxy Paints in industry and ShippingAmine cured epoxy paints are of rapidly growing importance for the corrosion protection of installations in refineries and chemical plants, storage tanks and sea-going tankers. Results of extensive practical trials and regular applications are shown and indicate successful use for protection against oil products, sea water, caustic solutions and various acids and acidic compounds. The influence of surface preparation is large and one of the remaining problems is to find an effective and cheap method of preparation. Further work is aimed at reducing the number of coats. In marine applications an important organizational problem has arisen when planing the coating work within the building schedule of the ship.
    Notes: Amingehärtete Epoxyharz-Anstriche haben für den Korrosionsschutz von Anlagen in Raffinerien und chemischen Betrieben, von Lagertanks und Hochseetankschiffen eine schnell wachsende Bedeutung gewonnen. Die Ergebnisse eingehender Versuche und Anwendungen in der Praxis liegen vor; sie zeigen die erfolgreiche Verwendung dieser Epoxyharz-Anstriche zum Schutz von Metallen und Beton gegen die Einwirkung von Ölprodukten, Seewasser, ätzenden Lösungen, verschiedenen Säuren und sauren Verbindungen. Die Vorbereitung der Oberfläche ist dabei von großer Bedeutung, und eines der noch ungelösten Probleme ist die Ermittlung einer wirksamen und billigen Vorbehandlungsmethode.Weitere Arbeiten haben zum Ziel, die Zahl der Anstrichschichten herabzusetzen. Ein wichtiges Organisationsproblem bei im Bau befindlichen Schiffen ist das Einfügen der Anstricharbeiten in den Rahmen des Bauplanes.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 761-765 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Ceramic coatings for Protection of Metals at High TemperaturesCeramic coatings are heat resisting coverings on metals to avert corrosion at high temperatures. There are high temperature-resistant enamals, refractory paints and flame sprayed, high melting oxides and cermets. In several countries high temperature enamals have gained increasing importance. They protect unalloyed steel up to 700° C and alloyed steel up to 1000° C against oxidation and intergranular corrosion. Thus, the resistance to creep stress and the durability are improved. High fireproof covers of Al2O3, ZrO2, TiO2, mullite and procelain or a Ni MgO cermet are sprayed in molten state by means of a flame spray gun. Ceramic coatings are applied for use in aviation, jet techniques, gas turbines and atomic reactors.
    Notes: Keramische Überzüge sind hitzebeständige Schutzschichten auf Metallen, die eine Korrosion bei hohen Temperaturen zu verhüten imstande sind. Sie umfassen Hochtemperaturemails, feuerfeste Anstriche und flammgespritzte hochschmelzende Oxyde und Cermets. Große Bedeutung haben in verschiedenen Ländern die Hochtemperaturemails erlangt. Derartige Überzüge schützen unlegierten Stahl bis zu 700, legierten Stahl bis zu 1000°C vor Oxydation und interkristalliner Korrosion. Dadurch werden die Dauerstandfestigkeiten verbessert und die Lebensdauer verlängert. Hochfeuerfeste Überzüge aus Al2O3, ZrO2, TiO2, Mullit, Porzellan oder einem Ni—MgO-Cermet werden mittels Flammspritzpistole schmelzflüssig auf das Metall aufgespritzt. Die keramischen Überzüge finden vor allem in der Luftfahrt, in der Raketentechnik, bei Gasturbinen und in Atomreaktoren Anwendung.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 755-760 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Protection against Corrosion by sprayed Zinc and Aluminium CoatingsUsed since 1922, metal spraying now has wide applications especially in the protection of steels against corrosion. Low-melting metals such as zinc and aluminium are mainly used. Both these metals may be applied by the powder as well as by the wire method. The physical properties of coatings produced by these two methods are different. Considering hitherto gained experience, the properties of the sprayed zinc and aluminium coatings are discussed in detail. The result is that sprayed coatings of aluminium and zinc afford effective protection of mild steel in water and in air. Besides giving cathodic protection, a protective effect may be obtained by blocking the pores of the metal coating by the corrosion products. In the case of aluminium the absorbing, amphothere hydroxide film on the metal surface may be involved in chemical reactions. In selecting the protective metal one must consider that sprayed aluminium is much more reactive than massive aluminium while there is no difference with zinc.
    Notes: Das seit etwa 1922 praktisch angewandte Metallspritzen finden zur Zeit eine vielseitige Verwendung, insbesondere zum Korrosionsschutz von Stahl, wobei vorwiegend die niedrigschmelzenden Metalle Zink und Aluminium als Spritzmetalle verwendet werden. Beide Metalle lassen sich sowohl im Pulver-, als auch im Drahtverfahren verarbeiten, doch sind die so erzielten Überzüge in ihren physikalischen Merkmalen deutlich verschieden. Unter Berücksichtigung der bisherigen Erfahrungen werden die Eigenschaflen der aufgespritzten Zink- und Aluminiumüberzüge eingehend behandelt. Zusammenfassend wird hierbei festgestellt, daß unter geeigneten Bedingungen Zink- und Aluminium-Spritz-Überzüge unter Wasser und in der Atmosphäre einen wirksamen Schutz für Weichstahl bieten. Für deren Schutzwirkung dürfte neben einem kathodischen Schutz des Grundmetalls vorwiegend die Blockierung der Poren im Metallüberzug durch Korrosionsprodukte maßgebend sein. Bei Aluminium dürfte auch der absorbierende amphotere Hydroxydfilm auf dem Metall an chemischen Reaktionen teilnehmen. Bei der Wahl des Schutzmetalls bleibt zu berücksichtigen, daß gespritztes Aluminium reaktionsfähiger ist als massives Aluminium, während sich gespritztes Zink wie massives Zink verhält.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 747-755 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion of High Alloy Steels by Nitric AcidThe corrosion diagrams and iso corrosion lines of temperable and nontemperable chrome steels, chrome-nickel steels and some others containing further alloy constituents in nitric acid solutions up to 67% are determined at all temperatures up to their boiling points, under atmospheric pressure. The resistance to corrosion of the different types of steel under definite conditions can be derived from these curves.Parts of the corrosion data obtained were used to study the influence of different alloy constituents by means of a graphic method. To achieve passivatation the minimum content of chrome increases with rising concentration of nitric acid and with rising content of carbon in the alloy. Exceeding additions of chrome exert an inhibiting influence too. Manganese is very effective especially in alloys containing up to 0.7 %. Ni and Cu and Si in particular cause increasing aggression. Mo does not influence corrosion, except in boiling acid solutions of 67% where corrosion is decreases at Mo contents up to 2%. At higher contents the corrosive attack rises.Over a wide range of concentrations corrosion tests were carried out in boiling solutions of diluted acids. With chrome steels maximum aggression occurred in the range of 0.1-1 n acid solutions if the content of chrome, with deduction of the amount of chrome necessary to form chrome iron carbides, was lower than 14.5%. The corrosion peaks are usually higher than the data of the attack of a 1.0 n nitric acid. Austenitic steels do not show behaviour like this except for 18/8 Cr/Ni automate steel which contains some sulphur. Its corrosion peak is in the range of 0.1-1.0n. In higher concentrated acids it corrodes much more than the usual 18/8 Cr/Ni steels.
    Notes: Für härtbare und nichthärtbare Cr-Stähle und für Cr—Ni-Stähle, teilweise mit weiteren Legierungselementen, wurden Korrosionsdiagramme mit Isokorrosionslininen für Salpetersäure bis 67% und bis zu den atmosphärischen Siedetemperaturen aufgestellt. Aus ihnen läßt sich die Korrosionsbeständigkeit der verschiedenen Stahltypen bei bestimmten Bedingungen ablesen.Ein Teil der erhaltenen Korrosionswerte wurde dazu benutzt, um nach einer graphischen Methode den Einfluß der verschiedenen Legierungselemente zu trennen. Es ergab sich, daß die zur Passivierung notwendige Mindestmenge an Chrom mit der Konzentration der Säure und mit dem C-Gehalt steigt. Aber auch nach Überschreitung dieser Grenze haben weitere Cr-Zusätze einen korrosions-mindernden Einfluß. Einen sehr starken, guten Einfluß hat Mangan, und zwar besonders stark in den Mengen bis 0,7%, so daß sich eine Überschreitung dieses Wertes empfiehlt. Ni, Cu und besonders Si erhöhen die Korrosion. Mo hat im allgemeinen keinen Einfluß, aber in 67%iger Säure bei Siedetemperatur fällt die Korrosion bei Mo-Gehalten bis zu 2% etwas, um bei höheren Mo-Gehalten wieder anzusteigen.In verdünnten Säuren wurden in einem Konzentrationsgebiet bei Siedetemperatur Korrosionsversuche durchgeführt. Hierbei traten bei Cr-Stählen in dem Gebiet zwischen 0,1 und 1,0 n hohe Korrosionsspitzen auf, wenn die Cr-Gehalte nach Abzug des für die Chrom-Eisencarbidbildung notwendigen Chroms unter 14,5% sanken. Diese Korrosionsspitzen liegen meist höher als die Korrosionswerte für 1,0 n-HNO3. Bei den austenitischen Stählen tritt diese Erscheinung nicht auf, der untersuchte 18/8-Cr—Ni-Automatenstahl mit S-Gehalt hatte jedoch die Korrosionsspitze bei 0,1 bis 1,0 n Säure, auch war seine Korrosion in den konzentrierten Säuren viel stärker als bei den üblichen 18/8-Cr—Ni-Stählen.
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 768-774 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 775-780 
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    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 780-783 
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 765-768 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Electro-Chemical investigations on the Mechanism of inhibition by Organic CompoundsThe modifications of stationary current density-voltage curves of the cathodic deposition of hydrogen in hydrochloric acid solutions, containing organic inhibitors, bring to light essential facts of the mechanism of cathodic inhibition, as well as of anodic if the rest potentials are considered. Three significant sections of the current density-voltage curves are examined.An anorganic inhibitor causes a displacement of the sections and an alterations of the rest potential in a characterisitc way: 1. The beginning of the curve, being straight in absence of inhibitors, is shortened. The rest potential becomes more positive. Both the effects may be deduced from the anodic activity of chemisorbed inhibitors. 2. The Tafel range falls to negative voltages with or without an increasing slope of the curve because of the higher activation polarization (partly accompanied by rising concentration polarization). 3. The apparent limiting current is decreased partly because of the coating on the metal of the cathode or because of a modification of the chemical composition of the diffusion film, (secondary reactions of inhibitors include a raise in pH value and in viscosity).The effects of inhibitors of different compositions are discussed.
    Notes: Aus Veränderungen der stationären Stromspannungskurven (SSK) der kathodischen Wasserstoffabscheidung aus HCl-Lösungen an Eisenkathoden lassen sich in Gegenwart organischer Inhibitoren wesentliche Aussagen über den Mechanismus der kathodischen und  -  in Verbindung mit dem gemessenen Ruhepotential  -  auch der anodischen Inhibition machen. Man betrachtet dabei drei kennzeichnende Abschnitte der SSK.Der organische Inhibitor kann diese Teilabschnitte sowie das Ruhepotential typisch verschieben: 1. Den ohne Inhibitor flachen Anfangsbereich der SSK im Sinne einer Verkürzung. Dabei fällt das Ruhepotential zugleich positiver aus. Beides beruht auf der anodischen Wirksamkeit des  -  chemisorbierten  -  Inhibitors; 2. den Tafelbereich nach negativen Galvanispannungen; teils ohne, teils mit vergrößerter Neigung der SSK, infolge erhöhter Durchtrittspolarisation (z. T. in Verbindung mit zunehmender Konzentrationspolarisation); 3. die gemessene „scheinbare“ Grenzstromdichte nach geringen Werten; teils infolge Bedeckung der Kathodenoberfläche oder aber außerdem infolge Veränderung der chemischen Zusammensetzung des Diffusionsfilms (sekundäre Reaktion des Inhibitors, verbunden mit pH-Erhöhung, Viskositätssteigerung oder Bildung schwerlöslicher „Barrieren“).Es wird die Wirkung von Inhibitoren verschiedener Konstitutionen erörtert.
    Additional Material: 4 Ill.
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 795-795 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 795-795 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 796-796 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 795-796 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 796-799 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 799-800 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 800-800 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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