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  • Polymer and Materials Science  (651)
  • Aerodynamics  (12)
  • Animals
  • 1990-1994
  • 1955-1959  (663)
  • 1925-1929
  • 1957  (663)
Collection
Publisher
Years
  • 1990-1994
  • 1955-1959  (663)
  • 1925-1929
Year
  • 1
    Publication Date: 2019-05-31
    Description: A 1/13-scale model of the forebody of the Republic F-105 with twin-duct wing-root inlets was tested in the Langley 4- by 4-foot supersonic pressure tunnel through a range of angle of attack from -4 deg to 15 deg at a Mach number of 2.01 and a Reynolds number of approximately 3.4 x 10(exp 6) per foot. The tests were made with four configurations which incorporated varying amounts of sweep and stagger of the inlet leading edges, modifications to the areas of the boundary-layer diverter floor plate, and modifications to the area of the boundary-layer diverter bleed slots. The highest overall pressure recovery at an angle of attack of 0 deg (average total-pressure recovery, 0.84 mass-flow ratio, 0.98) was achieved with configuration having an inlet leading-edge sweep angle of 58 deg with no leading-edge stagger. Stagger was found to improve the angle-of- attack performance, but at a sacrifice in inlet efficiency for an angle of attack of 0 deg. The boundary-layer diverter floor height, of the order of one boundary-layer thickness, was satisfactory for bypassing the fuselage boundary layer. The boundary-layer diverter-plate bleed slots were effective in increasing the total-pressure recovery of the inlet. The total-pressure-recovery contour plots, taken at the compressor-face station, indicate the existence of high-velocity "cores" throughout the inlet operating range.
    Keywords: Aerodynamics
    Type: NACA-RM-SL56L12
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  • 2
    Publication Date: 2019-06-28
    Description: A simplified analysis of the velocity and deceleration history of missiles entering the earth's atmosphere at high supersonic speeds is presented. The results of this motion analysis are employed to indicate means available to the designer for minimizing aerodynamic heating. The heating problem considered involves not only the total heat transferred to a missile by convection, but also the maximum average and local time rates of convective heat transfer.
    Keywords: Aerodynamics
    Type: NACA-TN-4047
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  • 3
    Publication Date: 2019-06-28
    Description: Ice was formed on a full-scale unheated supersonic nose inlet in the NACA Lewis icing tunnel to determine its effect on compressor-face total-pressure distortion and recovery.Inlet angle of attack was varied from 0degrees to 12 degrees, free-stream Mach number from 0.17 to 0.28, and compressor-face Mach number from 0.10 to 0.47. Icing-cloud liquid-water content was varied from 0.65 to 1.8 grams per cubic meter at free-stream static air temperatures of 15 degrees and 0 degrees F. The addition of ice to the inlet components increased total-pressure-distortion levels and decreased recovery values compared withclear0air results, the losses increasing with time in ice. The combination of glaze ice, high corrected weight flow, and high angle of attack yielded the highest levels of distortion and lowest values of recovery. The general character of compressor-face distortion with an iced inlet was the same as that for the clean inlet, the total-pressure gradients being predominantly radial, with circumferential gradients occurring at angle of attack. At zero angle of attack, free-stream Mach number of 0.27, and a constant corrected weight flow of 150 pounds per second (compressor-face Mach number of 0.43), compressor-face total-pressure-distortion level increased from about 6 percent in clear air to 12 percent after 21 minutes of heavy glaze icing; concurrently, total-pressure recovery decreased from about 0.98 to 0.945. For the same operating conditions but with the inlet at 12 deg angle of attack, a change in distortion level occurred from about 9 percent in clear air to 14 percent after 2-1/4 minutes of icing, with a decrease in recovery from about 0.97 to 0.94.
    Keywords: Aerodynamics
    Type: NACA-RM-E57G09
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  • 4
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    In:  CASI
    Publication Date: 2019-06-27
    Description: Of the various unsteady flows that occur in axial turbomachines certain asymmetric disturbances, of wave length large in comparison with blade spacing, have become understood to a certain extent. These disturbances divide themselves into two categories: self-induced oscillations and force disturbances. A special type of propagating stall appears as a self-induced disturbance; an asymmetric velocity profile introduced at the compressor inlet constitutes a forced disturbance. Both phenomena have been treated from a unified theoretical point of view in which the asymmetric disturbances are linearized and the blade characteristics are assumed quasi-steady. Experimental results are in essential agreement with this theory wherever the limitations of the theory are satisfied. For the self-induced disturbances and the more interesting examples of the forced disturbances, the dominant blade characteristic is the dependence of total pressure loss, rather than the turning angle, upon the local blade inlet angle.
    Keywords: Aerodynamics
    Type: O.N.E.R.A. PAPERS PRESENTED AT THE JOURNEES INTERN. DE SCI. AERON., PT. 2 〈1957〈 (SEE N68-81276) P 1-21
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  • 5
    Publication Date: 2019-06-27
    Description: No abstract available
    Keywords: Aerodynamics
    Type: NACA-RM-L56I18
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  • 6
    Publication Date: 2019-08-14
    Description: A full-scale rocket-powered model of a cruciform canard missile configuration with a low-aspect-ratio wing and blunt nose has been flight tested by the Langley Pilotless Aircraft Research Division. Static and dynamic longitudinal stability and control derivatives of this interdigitated canard-wing missile configuration were determined by using the pulsed-control technique at low angles of attack and for a Mach number range of 1.2 to 2.1. The lift-curve slope showed only small nonlinearities with changes in control deflection or angle of attack but indicated a difference in lift-curve slope of approximately 7 percent for the two control deflections of delta = 3.0 deg and delta = -0.3 deg. The large tail length of the missile tested was effective in producing damping in pitch throughout the Mach number range tested. The aerodynamic-center location was nearly constant with Mach number for the two control deflections but was shown to be less stable with the larger control deflection. The increment of lift produced by the controls was small and positive throughout the Mach number range tested, whereas the pitching moment produced by the controls exhibited a normal trend of reduced effectiveness with increasing Mach number. The effectiveness of the controls in producing angle of attack, lift, and pitching moment was good at all Mach numbers tested.
    Keywords: Aerodynamics
    Type: NACA-RM-L55K16
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  • 7
    Publication Date: 2019-08-13
    Description: Experiments have been made to determine the nature of turbulence in the wake of a two-dimensional airfoil at low speeds. The experiments were motivated by the need for data which can be used for analysis of the tail-buffeting problem in aircraft design. Turbulent intensity and power spectra of the velocity fluctuations were measured at a Reynolds number of 1.6 x 10(exp 5) for several angles of attack. Total-head measurements were also obtained in an attempt to relate steady and fluctuating wake properties. Mean-square downwash was found to have nearly the same dependence on vertical position in the wake as that shown by total-head loss. For this particular wing, turbulent intensity, integrated across the wake, increased roughly as the 3/2 power of the drag coefficient. Power-spectrum measurements indicated a decrease in frequency as wing angle of attack was increased. The average frequency in the wake was proportional to the ratio of mean wake velocity to wake width.
    Keywords: Aerodynamics
    Type: NACA-TM-1427
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  • 8
    Publication Date: 2019-08-13
    Description: It seems possible that, in supersonic flight, unconventional arrangements of wings and bodies may offer advantages in the form of drag reduction. It is the purpose of this report to consider the methods for determining the pressure drag for such unconventional configurations, and to consider a few of the possibilities for drag reduction in highly idealized aircraft. The idealized aircraft are defined by distributions of lift and volume in three-dimensional space, and Hayes' method of drag evaluation, which is well adapted to such problems, is the fundamental tool employed. Other methods of drag evaluation are considered also wherever they appear to offer amplifications. The basic singularities such as sources, dipoles, lifting elements and volume elements are discussed, and some of the useful inter-relations between these elements are presented. Hayes' method of drag evaluation is derived in detail starting with the general momentum theorem. In going from planar systems to spatial systems certain new problems arise. For example, interference between lift and thickness distributions generally appears, and such effects are used to explain the difference between the non-zero wave drag of Sears-Haack bodies and the zero wave drag of Ferrari's ring wing plus central body. Another new feature of the spatial systems is that optimum configurations generally are not unique, there being an infinite family of lift or thickness distributions producing the same minimum drag. However it is shown that all members of an optimum family produce the same flow field in a certain region external to the singularity distribution. Other results of the study indicate that certain spatial distributions may produce materially less wave drag and vortex drag than comparable planar systems. It is not at all certain that such advantages can be realized in practical aircraft designs, but further investigation seems to be warranted.
    Keywords: Aerodynamics
    Type: NACA-TM-1421
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  • 9
    Publication Date: 2019-08-13
    Description: A modified 1/10-power nose shape has been tested in free flight at Mach numbers up to 6.7 and free - stream Reynolds numbers based on diameter up to 16 X 10(exp 6). Measured heating rates were presented and compared with calculated values. Agreement ranges from poor on the forward portion of the nose to good on the rearward portion. The local Reynolds numbers of transition based on calculated momentum thickness varied between 1, 600 and 350. Laminar flow was maintained at momentum thickness Reynolds numbers of about 1,000 until the free-stream Reynolds number based on a length of 1 foot reached about 27 X 10(exp 6). At slightly higher free-stream Reynolds numbers transition occurred at momentum thickness Reynolds numbers as low as 250.
    Keywords: Aerodynamics
    Type: NACA-RM-L57E14a
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  • 10
    Publication Date: 2019-07-10
    Description: A flight investigation was conducted to determine the effects of inlet modification and rocket-rack extension on the longitudinal trim and low-lift drag of the Douglas F5D-1 airplane. The investigation was conducted with a 0.125-scale rocket-boosted model between Mach Numbers of 0.81 and 1.64. This paper presents the changes in trim angle of attack, trim lift coefficient, and low-lift drag caused by the modified inlets alone over a small part of the test Mach number range and by a combination of the modified inlets and extended rocket racks throughout the remainder of the test.
    Keywords: Aerodynamics
    Type: NACA-RM-SL57D30
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  • 11
    Publication Date: 2019-07-12
    Description: Tests were performed in the Langley Unitary Plan wind tunnel to determine the drag and static longitudinal and lateral stability and control characteristics of a 1/20-scale model of the McDonnell F4H-1 airplane at Mach numbers of 1 57, 1 87, 2.16, and 2.53. This is the second phase in a series of tests performed on this model. The Reynolds numbers for these tests, based on the mean aerodynamic chord of the wing, are 1.446 x 10 (exp 6), 1.269 x 10 (exp 6), 1.116 x 10 (exp 6), and 0.714 x 10 (exp 6) at Mach numbers of 1.57, 1.87, 2.16, and 2.53, respectively. The model had a 12 deg. wing tip dihedral, a larger vertical tail, and a modified duct.
    Keywords: Aerodynamics
    Type: NACA-RM-SL7A14
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  • 12
    Publication Date: 2019-07-12
    Description: Transition data on highly cooled blunt bodies are correlated in terms of the ratio of wall to local-stream enthalpy, Reynolds number based on displacement thickness, and location of transition. The proposed correlation, although not sensitive enough to predict the exact location of transition does predict the enthalpy ratio below which very early transition on blunt bodies is expected. The correlation is not altered by moderate amounts of surface roughness; however, the location of transition may well be affected by roughness.
    Keywords: Aerodynamics
    Type: NACA-RM-E-57J14
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  • 13
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 1-6 
    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: On the Corrosion of Wine Bottle aps Made of Thinly Tinned Lead (Tinfoil Caps) and their TestingSeveral method have been developed for the testing of the thickness and porosity of the tin layers of the customary tinfoil caps. The tin layers of commercial wine bottles were found to be less than 0,001 mm and for a great part considerably porous.To test the resistance of the caps to corrosion, laboratory experiments and practical storage tests have been carried out with commercially capped bottles. Under certain conditions which might be met in practice the caps were corroded considerably, and in some cases they were deteriorated totally. The corrosion products are lead salts.
    Notes: Es wurden Verfahren für die Prüfung der Dicke und der Porigkeit der Zinnauflage auf den üblichen sogenannten “Stanniol” - Flaschenkapseln entwickelt. Kapseln von aus dem Handel bezogenen Weinflaschen waren fast stets unter 0,001 mm dick verzinnt und meist erheblich porig.Zur Prüfung der Korrosionsbeständigkeit der Kapseln wurden Laboratoriumsversuche mit Kapseln und praktische Lagerversuche mit handelsüblich verkapselten Flaschen ausgeführt. Unter gewissen Bedingungen, die in der Praxis durchaus vorkommen können, wurden die Kapseln unter Bildung von Bleisalzen erheblich korrodiert, in einigen Fällen sogar völlig zerfressen.
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  • 14
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 24-26 
    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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  • 15
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 17-23 
    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: On the Anodic behavior of copper zinc alloys in sodium cyanide solutions IThe solubility of alloyed metal anodes is conditioned by the potential of the most not noble constituent of the alloy and the solubility of te cover primary formed on the surface of this constituent. Zinc and brass could be passivated much more easily tan copper. Both the constituents of the alloy react indepently just loke the pure metals. α + β bras is more active and can not be passivated as easily as α-brass. There are only gradual differences between the corrosion processes as well as between the reactions of anodic solution or passivation. The two metals dissolve one after the other and get passivated iin a process consisting of two steps. The voltage of the alloy shows the existence of a small depolarizing effect of teh metals upon one another.
    Notes: Die Löslichkeit von Legierungsanoden wird durch das Potential des unedelsten Bestandteiles der Legierung und die Löslichkeit der sich auf diesem Bestandteil primär ausbildenden Deckschicht bestimmt. Zink und Messing ist leichter zu passivieren als Kupfer. Beide Bestandteile reagieren in der Legierung unabhängig voneinander ähnlich wie die reinen Metalle, α + β-Messing ist aktiver und daher schwerer zu passivieren als α-Messing. Zwischen den Korrosionserscheinungen sowie den Vorgängen bei der anodischen Auflösung oder Passivierung der Legierungsanode bestehen nur graduelle Unterschiede. die beiden Metalle geben nacheinander in Lösung und werden in zwei Stufenprozessen passiv. Die Potentiale der Legierung zeigen eine geringe depolarisierende Wirkung der beiden Einzelmetalle aufeinander.
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  • 16
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 69-73 
    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: Polythylene plastic pipesPipes of soft and hart polythylene (Supralen soft and supralen hard) are gaining increasing application in constructions for transport of aggressive liquids and gases because of their good properties especially owing to their resistance to corrosion. So this paper presents a general and up to date survey of the commercial types and their dimensions and of the physical (mechanical, thermal, electric, hydraulic, acoustic, optical properties) and corrosion chemical behavior as well as te installation and fitting of polythylene pipes.
    Notes: Rohre aus Weich- und Hartpolyäthylen (Supralen, weich und Supralen, hart) finden infolge ihrer guten allgemeinen und spezifischen Eigenschaften, insbesondere ihres ausgezeichneten korrosionschemischen Verhaltens, zunehmende Verwendung in Anlagen zur Förderung aggressiver Flüssigkeiten und Gase. Im Hinblick darauf gibt der vorliegende Fortschrittsbericht einen zusammenfassenden und zeitgemäßen Überblick über Lieferarten und Dimensionierung, über das physikalische (mechanische, thermische, elektrische, hydraulische, akustische und optische Eigenschaften) und korrosionschemische Verhalten sowie über die Verlegung und Verbindung von Polyäthylen-Plastikrohren.
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  • 17
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 74-76 
    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: On an method for removal of boiler scaleThe solid incrustations in boilers etc. are removed usually by application of certain acids at those places of the devices where the incrustations have been formed. It is wellknown that the aggressive effect of the acids upon cleaned metal surfaces could be prevented by an addition of certain substances with inhibitive effect which will say that these substances decrease or even prevent acid attacks. The peper contains a report on the inhibitive effect of the „Brindi“-resin and some theoretical conclusions drawn from the experimental results.
    Notes: Feste Steinbildungen in Kesseln usw. werden in neuerer Zeit bekanntlich da-durch beseitigt, daß sie in den Anlagen, in denen sie sich gebildet haben, durch bestimmte Säuren gelöst wurden. Es ist auch bekannt, daß die aggressive Wirkung der Säuren auf die Metallflächen, die unter den Steinbildungen liegen, wenn letztere aufgelöst sind, dadurch verhütet wird, daß der Säure bestimmte Stoffe zugesetzt werden, die als Inhibitoren wirken, d. h. den Säureangriff verringern oder u. U. ganz verhüten. Im vorliegenden Aufsatz ist die diesbezügliche Wirkung des „Brindiharzes“ als Inhibitor laboratoriumstechnisch festgestellt und versucht worden, aus den Ergebnissen einige theoretische Folgerungen zu ziehen.
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  • 18
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 96-97 
    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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  • 19
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 98-99 
    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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  • 20
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 104-106 
    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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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 114-114 
    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 8 (1957), S. 115-116 
    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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  • 23
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 116-116 
    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
    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 8 (1957), S. 121-122 
    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 8 (1957), S. 299-301 
    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 8 (1957), S. 302-305 
    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 8 (1957), S. 313-313 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 315-315 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. X 
    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 8 (1957), S. 345-345 
    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: Will lead colors become dispensable?Minium is a theoreically ideal protective pigment whose application may be entrusted without any danger even to little trained personnel. Protective covers are formed in the minimum film which prevent underrusting. Its electrochemical effect upon the metallic surface is independent of the chemical properties of the binder. Iron wash primers free from lead may be applied only under certain conditons. New directions confirm that lead colors are indispensable.
    Notes: Die Bleimennige ist ein „theoretisch ideales“ Schutzpigment, dessen anwendung man völlig gefahrlos auch weniger geschulten Hilfskräften überlassen kann.  -  In ihrem Film bilden sich Schutzschichten, die die Unterrostung verhindern.  -  Ihre elektrochemische Einwirkung auf den metallischen Untergrund ist von der chemischen Natur des Bindemittels unabhängig.  -  Bleifreie Eisengrundiermittel sind nur bedingt anwendbar.  -  Neue Betriebsvorschriften bestätigen die Unentbehrlichkeit der Bleifarben.
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  • 32
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 357-360 
    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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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 369-370 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 99-101 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 114-114 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 116-116 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 117-117 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 122-123 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 125-131 
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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: The Vanal Process A new Way to Protection against CorrosionThe Paper contains a description of a new method to protect the surface of fireproof building-materials against untimely corrosion at high temperatures. The protective effect depends on surface tension. So this principle has been applied to protection against corrosion for the first time. Suitably arranged protective covers prevent any penetration of gases and slags. The technological and economical advantages of this process especially by application of silicon carbide are explained by means of practical examples.
    Notes: Es wird ein neues Verfahren beschrieben, durch das die Oberflächen feuerfester Baustoffe vor vorzeitiger Korrosion bei hohen Temperaturen geschützt werden. Die Wirkung beruht auf dem Gesetz der Oberflächenspannung, das hierfür erstmalig angewandt wird. Durch entsprechend ausgerichtete Schutzschichten wird das Eindringen von Gasen und Schlacken verhindert. An Hand von Beispielen as der Praxis wird der technische und wirtschaftliche Vorteil dieses Verfahrens besonders bei Siliciumcarbid erläutert.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 170-170 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 240-240 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 244-244 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 448-448 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 587-596 
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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: Corrosion in High-Temperature-BoilersExperiences with corrosion of highly heat resisting steels in high temperature boilers in Germany are discussed by means of the working 600° boilers after 40 000 h of operation. Steam scalling in pure steam is very low. As soon as steam will be solid noticeably corrosive attacks will become dangerous. According to the high standard to water treatment such effects could be prevented so that damages caused by the water must be considered unusual.Damages caused by smoke occured as soon as the flying ashes contained alkali sulfates. The area of damage will be there where a eutectic mixture of sulfates could melt. There are some measures how to prevent this corrosion.Steels containing vanadium may not be used above 600°C as vanadium scaling might occur which was learnt in burning oils containing vanadium.
    Notes: Die Erfahrungen über das Korrosionsverhalten der hochwarmfesten Stähle in Hochtemperaturkesseln werden in Deutschland an Hand der im Betriebe befindliche 600°-Kessel nach rd. 40 000-stündiger Betriebszeit besprochen. Die Dampfzunderung in reinem Dampf ist gering. Gefahren treten erst auf, sobald der Dampf merkbar verunreinigt ist. dieses läß sich bei dem heutigen hohen Stande der Wasseraufbereitung vermeiden, so daß Korrosionsschäden von der Wasserseite her als ungewöhnlich zu betrachten sind.Schäden von der Rauchgasseite her sind bekannt geworden, sobald in der Flugasche Alkalisulfate vorkommen. Der Schadensbereich liegt in erster Linie dort, wo ein Eutektikum der Sulfate zu schmelzen vermag. Es werden Wege angegeben, wie diese Korrosion zu vermeiden ist.Vanadinhaltige Stäle scheiden für Temperaturen oberhalb 600° aus, da dann dieselbe Vanadinzunderung auftreten kann, welche von der Verfeuerung vanadinhaltiger Öle her bekannt ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 610-614 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 629-631 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 622-628 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 291-293 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 294-296 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 297-298 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 313-313 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 314-314 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 314-315 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 324-329 
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    Description / Table of Contents: Polyvinylchloride Plastik PipesPipes of polyvinylchloride (Supradur) are gaining increasing application in contructions for transport of aggressive liquids and gases because of their good properties especially owing to their resistance to corrosion. So this paper presents a general and up to date survey of the commercial types and their dimensions and of the physical and corrosion chemical behavior as well as the methods of installation and fitting of polyvinylchloride pipes.
    Notes: Rohre aus Polyvinylchlorid (Supradur) finden infolge ihrer guten allgemeinen und spezifischen Eigenschaften, insbesondere ihres ausgezeichneten Korrosionschemischen Verhaltens, zunehmende Verwendung in Anlagen zur Förderung aggressiver Flüssigkeiten und Gase. Im Hinblick darauf gibt der vorliegende Fortschrittsbericht einen zusammenfassenden und zeitgemäßen Überblick über Lieferarten und Dimensionierung, über das physikalische und korrosionschemische Verhalten sowie über die Verlegung und Verbindung von Polyvinylchlorid-Plastikrohren.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 349-352 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 385-389 
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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: Graphical representation of the theory of local cellsThe article is concerned with a graphical representation of the theory of local cells by means of the experimentally realized relation \documentclass{article}\pagestyle{empty}\begin{document}$$ e_1 - e_0 = i\frac{{{\rm W}_{\rm a} \cdot {\rm W}_{\rm k}}}{{{\rm W}_{\rm a} + {\rm W}_{\rm k}}} $$\end{document} respectively by a corresponding relation regarding the influences of alterations of polarization. e1 is the total voltage of the electrode bearing the local cell. The voltages of the local cell are cA and cK and its current is i. eo is the total voltage of the electrode at i = 0. Wa and Wk are the coefficients of resistance of the anodic and cathodic locations. Fig. 1. The diagram containing all the partial terms necessary to describe the properties of local cells results from the numerical relations between the constant terms c and W. Fig. 2. The author shows that you will be unable to construct the diagram on basis of the relation above mentioned only. In special cases only some of the partial terms mentioned are available. For the terms c and W depending on current density the diagram is given by curves resulting from a great number of experimental data.
    Notes: Der vorliegende Artikel verfolgt die graphische Darstellung der Konzeption von Lokalelementen auf Grund der experimentell zugänglichen Beziehung \documentclass{article}\pagestyle{empty}\begin{document}$$ e_1 - e_0 = i\frac{{{\rm W}_{\rm a} \cdot {\rm W}_{\rm k}}}{{{\rm W}_{\rm a} + {\rm W}_{\rm k}}} $$\end{document} bzw. einer entsprechenden Beziehung, in welcher Rücksicht genommen wurde auf die Polarisationsänderungen der Potentiale und Widerstände. ei ist das Gesamtpotential der Elektrode mit dem Lokalelement, dessen Potentiale εa und εk sind, bei einem Stromdurchgang i, eo ist das Gesamtpotential derselben Elektrode bei i = 0. Wa bzw. Wk sind die Widerstands-werte an der anodischen bzw. kathodischen Stelle (s. Abb. 1). Aus den rechnerischen Beziehungen, die für konstante Werte ε und W gelten, folgt das Diagramm, in welchem man alle Teilgrößen, die in der Konzeption der Lokalelemente vorkommen, wiederfinden kann (s. Abb. 2). Es wird darauf aufmerksam gemacht, daß die obenerwähnte Beziehung nicht zur Konstruktion dieses Diagramms genügt. Man muß jedoch zu diesem Diagramm kommen, wenn man für denselben Zweck in Sonderfällen einige der erwähnten Teilgrößen kennt. Bei den Größen ε und W, die stromabhängig sind, ist das entsprechende Diagramm durch Kurven gegeben, zu denen man eine gehörige Zahl Versuchsangaben kennen muß.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 410-414 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 430-430 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 444-444 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 444-444 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. XVI 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 574-579 
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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 Influence of Trace Elements on the Non Scaling Properties of High Temperature Resistent AlloysThe alloys which are employed at heat transport materials are noted out by more or less high contents of trace elements of which calcium and cerium are the most important ones. These additives cause a considerable improvement of the resistance to oxidation. The results of high temperature oxidation experiments of allosy with and without those quality improving additives are reported. The author shows that the effectivity of those elements is caused by an increased adhesiveness of the oxide layer which is formed during the high temperature glowing.The results of x-ray-photographic and spermicroscopic investigations on the problem of the formation of the oxide layers on ion-chrome-aluminium-alloys are published.
    Notes: Metallegierungen, die als Heizleiterwerkstoffe Verwendung finden, zeichnen sich durch einen mehr oder weniger hohen Gehalt an gewissen Spurenelementen aus, unter denen Calcium und Cer die bedeutendste Rolle spielen. Diese Zusätze bedingen eine erhebliche Verbesserung der Oxydationsbeständigkeit der Heizleiterlegierungen. Es wird über experimentelle Ergebnisse der Hochtemperatuorxydation solcher Legierungen mit und ohne qualitätserhöhende Zusätze berichtet und nachgweisen, daß der Effekt jener Elemente in der Verbesserung der Haftfestigkeit der sich während der Hochtemperaturglühung ausbildenden Oxydschicht zu suchen ist.Zur Frage der Oxydausbildung auf Eisen-Chrom-Aluminium-Legierungen werden röntgenographische und elektronenmikroskopische Ergebnisse mitgeteilt.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 596-602 
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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: New Methods of Iron Protection in SoilsThe conditions of formation of the active and passiv behavior of iron are given. The structure of the soil resp. the alteration of the capillar and noncapillar porosity play a decisive role. Then the factors like solid water, soil air, soil resistance and acidity which influence the corrosion processes in soils are discussed. The ratio soil water to soil air was found to be characterizing the corrosion of iron in soils. Every soil has a specific aggressivity which is determined by the water capacity of the soil.The authors gives further advices how to decrease the corrosion of iron in soils with and without cathodic protection, by addition of inhibitors and by preparing artificial airation cells.
    Notes: In der vorliegenden Arbeit werden zuerst die Bedingungen für das Zustandekommen eines aktiven bzw. passiven Verhaltens des Eisens gegeben, wobei Bodenstruktur bzw. Änderungen der kapillaren und nichtkapillaren Porosität des Bodens eine entscheidende Rolle spielen. Anschließend werden die die im Boden ablaufenden Korrosionsprozesse beeinflussenden Faktoren diskutiert, and zwar Bodenwasser, Bodenluft, Bodenwiderstand und Wasserstoffionen-Konzentration. Dabei wurde das Verhältnis, „Bodenwasser zu zu Bodenluft“ als maßgebender, die Eisenkorrison im Erdboden regulierender Faktor, gefunden. Jeder Boden besitzt eine spezifisches Aggressivität, die durch das Annahmevermögen des Bodens an Wasser bestimmt ist.In der Arbeit werden weiter Ratschläge für der Verminderung der Eisenkorrosion im Erdreich ohne und mit kathodischem Korrosionsschutz, durch Zusatz chemischer Hemmstoffe und durch Erzeugung eines künstlichen Belüftungselementes gegeben.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 603-606 
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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: Rubber for Protection against CorrosionA survey of the mechanic and chemical properties of protective materials, especially rubber vulcanizates, is followed by a description of the working and testing methods which explains the special requirements of DIN 28051 and 28055 to operating and designing engineers.Furthermore the properties of rubber plated pipes are compared with those of massive plastic pipes. Before the chemical behavior of protective rubber coverings is discussed in general the behavior of protective paints is treated. The applicability of synthetic elastomers could not be discussed in detail. As mentioned in the first part of the artidle they may not be judged on their chemical behavior only. Then the latest development of those plastic materials is commented which will show better resistance to oxidizing agents. They are interesting products of the oldest hard rubber manufactury which has been producing plastics for mroe than 50 years and which together with a French manufactory has been leading in development and introduction of hard an soft rubber coating since 1885.
    Notes: Nach einem Überblick über die mechanischen und chemischen Voraussetzungen von Korrosionsschutzmaterialien, insbesondere Kautschukvulkanisaten, werden Arbeits- und Prüfverfahren geschildert, die dem Betriebsmann und Konstrukteur von Apparatebauteilen die besonderen Anforderungen der DIN 28051 und 28055 erläutern.Ferner werden die Eigenschaften gummiplattierter Rohrleitungen denen von Massivrohrleitungen auf Kunststoffbasis gegenübergestellt. Bevor auf das allgemeine chemische erhalten von Schutzgummierungen eingegangen wird, wird das Verhalten von Anstrichen als Korrosionsschutz behandelt. Ohne im Detail auf die Einsatzmöglichkeiten synthetischer Elastomere, die, wie im ersten Tel des Aufsatzes hervorgehoben wird, keineswegs lediglich aus deren chemischen Verhalten beurteilt werden dürfen, einzugehen, werden kurz neuere Entwicklungen von Kunststoffen gestreift, die geeignet zu sein scheinen, die bestehende Lücke gegen stark oxydierende Medien zu schließen. Es sind besonders interessante Erzeugnisse des ältesten europäischen Hartgummi-Werkes, das seit über fünf Jahrzehnten auch andere Kunststoffe herstellt und das neben einer französischen Firma maßgeblich an der Einführung und Entwicklung der Hart- und Weichgummierungen seit 1885 beteiligt ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 634-640 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 649-649 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 656-656 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 651-656 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 669-673 
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    Description / Table of Contents: Investigations on the Influence of Oxygen upon Iron SurfacesThe behavior of solid and pyrophorus iron surfaces upon commercial and purified nitrogen and their tendencies to oxidation was investigated. Stroing both the materials in pure nitrogen the gas does not influence the tendency to oxidation as demonstrated by special glowing experiments. The decrease of pyrophority of iron powder being stored in commercial nitrogen is explained by the presens of traces of oxygen in the protective gas which cause a slow but undisturbed formation of an oxide layer.
    Notes: Hinsichtlich ihres Verhaltens gegenüber technischen und gereinigten Stickstoff und ihrer anschließenden Oxydationsneigung untersucht wurden kompakte eisenoberflächen und pyrophore Eisenpulver. Spezial-Glühversuche ergaben, daß bei der Lagerung beider Werkstoffe in Reinst-Stickstoff dieser selbst keinen Einfluß auf die Oxydationsneigung des Eisens ausübst. Die Verhinderung der Pyrophorität von Eisenpulver durch Lagerung in technischem Stickstoff wird auf eine langsam, feinbaulich geregelt aufwachsende Oxydschicht durch im Stickstoff vorhandene Sauerstoffspuren zurückgeführt.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 695-696 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 717-717 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 725-726 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 566-568 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 793-794 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 794-794 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 795-795 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 32-33 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 49-49 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 59-59 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 67-69 
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    Description / Table of Contents: Indications on how to treat and how to use platinium crucibles and traysThe durability of laboratory instruments like crucibles, trays, tongs etc. made of platinium could be prolonged by proper and suitable treating. To avoid high temperatures, greasy storage places and the effect of smoking flames and reducing atmospheres will be as useful as to take precautions in the mechanical removal of melting remainders, Numerous experiments could be carried out in platinium vessels without any danger for the material if you know and regard its pecularities.
    Notes: Die Lebensdauer von Laborgeräten wie Tiegeln, Schalen, Zangen usw. aus Platin kann durch sachgemäße Behandlung wesentlich verlängert werden. Vermeidung hoher Temperaturen, verschmutzter Abstellflächen und des Einflusses rauchender Flammen und reduzierender Atmosphären sind ebenso nützlich wie Vorsicht bei der mechanischen Entfernung von Schmelzrückständen. Zahlreiche Reaktionen lassen sich in Platingefäßen ohne Gefahr für den Werkstoff ausführen, wenn man dessen Eigenarten kennt und ihnen in geeigneter Weise Rechnung trägt.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 30-31 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 123-124 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 133-138 
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    Description / Table of Contents: The corrosion of soft steel in alkali mono- und alkali hydrogen fluorides I. The influence of the concentration of the solution upon the corrosion of soft steelThe influece of the concentration of alkali mono  -  and alkali hydrogen fluoride solutions upon the corrosion of soft steel has been investigated. In all solutions a corrosive attack is taking place. It depends on the concentration of the soultion. The corrosion velocity  -  concentration diagramm shows a characteristic tershold value which is followed by an approximation to a minimum. In KF- and KF·HF solutions corrosion resistant covers are formed finally while in (NH4)F HF solutions even at relatively high concentrations a corrosive attack was recorded.
    Notes: Untersucht wurde der Einfluß der Konzentration von Alkalimono- und Alkalihydrogenfluorid-Lösungen auf die Korrosion von Weichstahl. In allen Lösungen kommt es zu einem konzentrationsabhängigen Angriff. Die Korrosionsgeschwindigkeit-Konzentrationskurve weist einen charakteristischen Schwellenwert auf, nach dessen Überschreiten strebt die Korrosionsgeschwindigkeit- Konzentrationskurve einem Minimum zu. In KF- und in KF · HF-Lösungen kommt es schließlich zur Ausbildung korrosionsschützender Deckschichten, während in (NH4)F · HF-Lösungen selbst bei verhältnismäßig hohen Konzentrationen noch ein gewisser Angriff zu verzeichnen ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 158-163 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 171-177 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 177-178 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 184-184 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 216-233 
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    Description / Table of Contents: On the behavior of materials upon hydrogen fluoride and hydrofluoric acidNumerous papers, published within the previous five years, and industrial experience allow to draw a picture of our knowledge of the behavior of materials upon hydrogen fluoride and hydrofluoric acid. Not alloyed steels, nickel, coper, silver and lead are resistent to hydrofluoric acids of moderate concentrations. Ingot steel is resistent even to acids of more than 65 pct. Aluminum and titanium are deteriorated by hydrofluoric acids of all concentrations though they are more or less resistent to dry hydrogen fluoride just like the metals, first mentioned, except lead. Except of the silica cements all acid proof cements and especially the plastic cements with carbon filling could be used in hydrofluoric acid engineering. Natural and synthetic rubber are materials qualified to build hydrofluoric acid containers of. Plastics like pvc, polythylene, polyfluorethylene and some more are qualified to be used in presence of hydrofluoric acid of less than 50 pct. at moderate temperatures.
    Notes: Aus den zahlreichen Veröffentlichungen der letzten 5 Jahre und praktischen Betriebserfahrungen ergibt sich ein Bild unseres heutigen Wissens über das Verhalten der Werkstoffe gegenüber wäßriger Flußsäure und wasserfreiem Fluorwasserstoff. Unlegierte Stäble, Nickel, Kupfer, Silber und Blei sind gegen mäßig konzentrierte Säure beständig; Flußstahl auch gegen solche von 〈 65%. Aluminium und Titan werden von flußsäure aller Konzentrationen zerstört, sind jedoch gegenüber wasserfreiem Fluorwasserstoff  -  ebenso wie die zuerstgenannten Metalle mit Ausnahme von Blei  -  mehr oder weniger resistent. Säurefeste Kitte und Zemente sind  -  für die Anwendung gegenüber Flußsäure geeignet, besonders die Kunststoff-Kitte mit Kohlenstoff-Füllung. Natur- und Synthesekautschuk dienen als Werkstoff für Lager- und Transportbehälter. Von den Kunststoffen eignen sich PVC, Polyäthylen, Polyfluoräthylene und einige andere für die Handhabung 〉 50%iger Flußsäure bei mäßigen Temperaturen.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 51-51 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. I 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 61-66 
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    Description / Table of Contents: On the anodic behavior of brass in copper and zinc cyanide solutions IIThe processes of the anodic dissolution and passivation of brass in copper and zinc cyanide solutions were investigated by means of the Mueller Machu method, measurements of potential and gravimetric analyses. The solubility of the anodes is conditioned mainly by the bulkconcentration of the electrolyte, the content of free NaCN and the current density. Zinc and copper dissolve independently. Zinc is the first to dissolve. Zinc cyanide has the same effect upon the solubility as free NaCN. By alteration of the experimental conditions it has been possible fo force a brass anode to behave one time like a zinc anode and the other time like a copper anode. The solubility of zinc in brass is decreased by increasing copper concentrations of the electrolyte. The solubility of the brass anode does not increase according to a linear but to an exponential law. Measurements of potential show that the voltage of brass electrodes is sensitive to concentration polarizations by zinc ions.
    Notes: Die Vorgänge bei der anodischen Auflösung und Passivierung von Messing wurden in Cu- und Zn-Cyanidlösungen mit Hilfe der Untersuchungsmethoden von Müller-Machu, Potentialmessungen und gravimetrisch-analytisch untersucht. Die Löslichkeit der Anoden wird vornehmlich durch die Gesamtkonzentration des Elektrolyten, den Gehalt an freiem NaCN und die Stromdichte bestimmt. Zink und Kupfer lösen sich praktisch unabhängig voneinander auf, wobei zuerst das Zink in Lösung geht. Zink-cyanid wirkt ähnlich auf die Löslichkeit wie freies NaCN. Durch Änderung der Versuchsbedingungen ist es möglich, daß sich eine Messinganode einmal wie eine Zink-, das anderemal wie eine Kupferanode verhält. Die Löslichkeit des Zinks im Messing wird durch Erhöhung des Kupfergehaltes des Bades herabgesetzt. Die Löslichkeit der Messinganode steigt nicht linear, sondern exponentiell mit der Konzentration der Badbestandteile an. Potentialmessungen zeigen, daß die Messingelektroden auf eine Konzentrationspolarisation durch Zinkionen ansprechen.
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 86-91 
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    Keywords: Chemistry ; Polymer and Materials Science
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