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  • Polymer and Materials Science  (3,775)
  • AERODYNAMICS  (98)
  • Fisheries
  • 1955-1959  (3,873)
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Years
Year
  • 1
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    In:  CASI
    Publication Date: 2006-10-26
    Keywords: AERODYNAMICS
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  • 2
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    In:  CASI
    Publication Date: 2006-10-26
    Keywords: AERODYNAMICS
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  • 3
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    In:  CASI
    Publication Date: 2006-10-26
    Keywords: AERODYNAMICS
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  • 4
    Publication Date: 2006-03-16
    Keywords: AERODYNAMICS
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  • 5
    Publication Date: 2012-05-11
    Keywords: AERODYNAMICS
    Type: RM-2419-NASA , RM-2419-NASA
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  • 6
    Publication Date: 2019-05-23
    Description: Wind tunnel data of X-15 and B-52 aircraft models carry loads and mutual interference
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-184
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  • 7
    Publication Date: 2019-05-23
    Description: Wind tunnel tests - effect of wind induced loads on dynamically scaled model of large missile in launching position
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-109
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  • 8
    Publication Date: 2019-05-23
    Description: High subsonic speed of static longitudinal aerodynamic characteristics of delta wing configuration for angle of attack from 0 deg to 90 deg
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-168
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  • 9
    Publication Date: 2019-05-23
    Description: Stability and control of variable sweep wing configuration with outboard wing panels swept back 75 degrees at Mach 2.01
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-32
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  • 10
    Publication Date: 2019-05-23
    Description: Zero angle of attack performance of isentropic spike inlet designed for maximum external compression at hypersonic speed
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-4
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  • 11
    Publication Date: 2019-05-29
    Description: Transonic wind tunnel study of aerodynamic characteristics of blunt reentry vehicles at varying angles of attack
    Keywords: AERODYNAMICS
    Type: NASA-MEMO-1-21-59L
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  • 12
    Publication Date: 2019-05-30
    Description: Hypersonic flutter tests on rectangular flat-plate models and double-wedge airfoils in helium flow
    Keywords: AERODYNAMICS
    Type: NASA-MEMO-4-8-59L
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  • 13
    Publication Date: 2019-05-23
    Description: Wind tunnel studies at supersonic and transonic speeds to determine aerodynamic characteristics of variable sweep wing aircraft - configuration
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-206
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  • 14
    Publication Date: 2019-05-23
    Description: Mach number and air temperature effect on hypersonic flow over blunt bodies
    Keywords: AERODYNAMICS
    Type: NASA-MEMO-10-9-58A
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  • 15
    Publication Date: 2019-05-23
    Description: Overall stage and stator blade element performance with straight stator and tilted stator in transonic axial flow compressor stage
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-99
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  • 16
    Publication Date: 2019-05-23
    Description: Pressure measurements in flight over conically cambered delta wing of F-102A aircraft at transonic speeds
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-48
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  • 17
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    In:  Other Sources
    Publication Date: 2019-05-10
    Keywords: AERODYNAMICS
    Type: NASA-CR-50493 , RM-2417-NASA
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  • 18
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    In:  Other Sources
    Publication Date: 2019-05-10
    Keywords: AERODYNAMICS
    Type: JPL-170
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  • 19
    Publication Date: 2019-05-29
    Description: Low speed measurements of oscillatory lateral stability derivatives of 60 degree delta wing bomber model
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-13
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  • 20
    Publication Date: 2019-05-30
    Description: Pitch and control stiffness effects on flutter characteristics of all-moveable wing and vertical and horizontal tails on fighter aircraft at supersonic speeds
    Keywords: AERODYNAMICS
    Type: NASA-MEMO-10-16-58L
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  • 21
    Publication Date: 2019-05-30
    Description: Aerodynamic effects of airfoil thickness on transonic flutter characteristics of swept and unswept wings
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-79
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  • 22
    Publication Date: 2019-05-23
    Description: Effect of forebody strakes on aerodynamic characteristics in sideslip and pitch of hypersonic aircraft configurations
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-116
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  • 23
    Publication Date: 2019-05-23
    Description: Determination of loads due to wing twist at transonic and low supersonic speeds
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-126
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  • 24
    Publication Date: 2019-05-23
    Description: Investigation of amplitude and phase shift of static pressure variations in supersonic diffuser for separate oscillation of spike and bypass
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-10
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  • 25
    Publication Date: 2019-05-23
    Description: Fighter aircraft external stores ejection at transonic and supersonic speeds
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-128
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  • 26
    Publication Date: 2019-05-23
    Description: Aerodynamic characteristics of variable sweep aircraft configurations - low altitude supersonic vehicle
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-142
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  • 27
    Publication Date: 2019-06-27
    Description: Constant chord, trailing edge, control deflection effects on aerodynamic loading characteristics of 60 degree delta wing-body combination at transonic speeds
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-122
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  • 28
    Publication Date: 2019-06-27
    Description: Wind tunnel determination of supersonic flow properties in vicinity swept, delta, and trapezoidal wing-body combinations
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-64
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  • 29
    Publication Date: 2019-06-27
    Description: Full-scale wind tunnel determination of effect of corrugated canister surface on static aerodynamic characteristics of reentry capsule
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-220
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  • 30
    Publication Date: 2019-06-27
    Description: Pressure distribution on hypersonic glide configuration having 79.5 deg sweepback and 45 deg dihedral at Mach number of 4.95
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-223
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  • 31
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    In:  CASI
    Publication Date: 2019-08-14
    Description: No abstract available
    Keywords: AERODYNAMICS
    Type: MSF-TN-J-13-59 , BAC-7021-3252-002
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  • 32
    Electronic Resource
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 412-415 
    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
    Additional Material: 2 Tab.
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  • 33
    Electronic Resource
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959) 
    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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  • 34
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 29-37 
    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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  • 35
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 1-14 
    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: Latest Developments in Antirust PaintingFor constructions made of steel a durable protection against rust can only be achieved if all factors conditioning the corrosive effects, especially the environmental influences like rain, dew, the dew point, temperature and agressiveness of the atmosphere, are considered. Their effects on the problem of priming and preliminary treatments of the surface (removal of scale and rust), on the efficiency of rust removers as well as on the protective value of wash primers are discussed. This is followed by information on the composition of protective paints, pigments and binders for priming and the composition of top coats; the specific aptitude of pigments, fillers and binders as well as on protective top paints.
    Notes: Ein dauerhafter Rostschutz von Stahlbauwerken setzt die Kenntnis aller sich auswirkenden Faktoren, insbesondere der Umwelteinflüsse wie Regeneinwirkung, Taubildung, Taupunkt, Temperatur und Aggressivität der Atmosphäre voraus. Ihre Auswirkung auf die Frage der Werksgrundierung, insbesondere der Untergrundvorbereitung (Entzunderung, Entrostung, Eignung) von Rostumwandlern und Schutzwert von Wash-Primern wird besprochen. Es folgen grundsätzliche Angaben über den Aufbau der Schutzanstrichmittel, Pigmente und Bindemittel für Grundierungen, über verschiedenartige Grundanstriche, über die Zusammensetzung der Deckanstriche, der spezifischen Eignung der Pigmente, Füllstoffe und Bindemittel, und über Rostschutz-Deckfarben.
    Additional Material: 9 Ill.
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  • 36
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 38-40 
    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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  • 37
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 26-29 
    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
    Description / Table of Contents: The Influence of Protective Colloids upon the Corrosion of BrassSome investigations showed that the corrosion of brass by acid plant substances is much lower than that caused by the corresponding vegetable acids of the same pH-value. The reason is obviously the presence of colloids in the plant matter. The article presents the results of investigations on the effects of protective colloids like pulvis acacia, e.g. albumin, agar, dextrine and potato starch upon the corrosion of brass in citric acid, hydrochloric acid and sulfuric acid. The data are represented in chart form. The protective effects of the various colloids differ very much according to the combination of colloid and acid. While an essential decrease of corrosion took place in citric acid solutions which is explained by an adsorption of colloid on the metal surface and the formation of a protective cover, the rate of corrosion was increased if hydrochloric acid was used even at constant concentration of colloids. Here dezincification took place which means that the more basic metal suffered a more intensive corrosive attack. The authors believe that protection in hydrochloric solutions could be achieved if a higher concentration of the colloid were used.
    Notes: Bei Forschungsarbeiten war gefunden worden, daß die Korrosion von Messing durch säuernde pflanzliche Substanzen geringer war als die durch die entsprechenden Fruchtsäuren mit gleichem pH verursachte Korrosion. Der Grund der Herabsetzung war offenbar der Kolloidgehalt der Pflanzen und in der vorliegenden Arbeit werden die Resultate von Untersuchungen über die Einwirkung derartiger Schutzkolloide wie Pulvis Acacia, Ei-Albumin, Agar, Dextrin und Kartoffelstärke auf die Korrosion von Messing in Zitronensäure, Salzsäure und Schwefelsäure vorgelegt. Das Material wurde in Tabellen zusammengestellt. Es zeigte sich, daß die Schutzwirkung der verschiedenen Kolloide sehr unterschiedlich war, sowohl in Bezug auf die Kolloide selbst als auch auf die angewandten Säuren. Während sich bei Zitronensäure deutliche Schutzwirkung durch Herabsetzung der Korrosion einstellte, die durch Adsorption des Kolloids an das Metall und Bildung eines Schutzfilms erklärt wird, wurde bei Salzsäure die Korrosion erhöht, wenn die gleichen Kolloidkonzentrationen angewendet wurden und es trat “Entzinkung” ein, d. h., das basische Metal wurde stärker angegriffen. Die Verfasser sind der Meinung, daß bei Verwendung höherer Kolloidkonzentrationen auch bei Salzsäure Schutzwirkung eintreten würde.
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  • 38
    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 Electro-Deposition of Titanium from Aqueous Solutions of Potassium-Titanium-FluorideAs discerned from current density-voltage curves titanium can be deposited from aqueous solutions of potassium titanium fluoride. The deposition of the metal takes place by the formation of TiO++ ions and their reduction by nascent hydrogen. The cathode must consist of metals with high overvoltage. On aluminium cathodes deposition of titanium and passivation by aluminium and titanium hydroxides take place simultaneously.The effects are in agreement with the law of the formation of surface covers by Müller Machu. The current yields are very low. Though they would not exceed 30 pct. the current yields of this method are higher than ever before when other titaniums salts are used.On zinc cathodes there is no passivation. So the percentage of the metallic titanium in the deposition is higher than on aluminum cathodes. Micro-photographs demonstrate the influences of additives like gelatin, thiourea etc. which suppress the formation of hydroxides and oxides in the deposition. The formation thick deposits of titanium which are free from oxides is still meeting difficulties.
    Notes: Titan läßt sich, wie anhand von Strom-Spannungskurven gezeigt wird, aus dem Kaliumtitanfluorid in wäßriger Lösung abscheiden. Dabei erfolgt die Metallabscheidung auf dem Umweg über die Bildung von Ti2+-Ionen und durch Reduktion durch naszierenden Wasserstoff. Als Kathodenmaterial sind nur Metalle mit hoher Überspannung geeignet. An Aluminiumkathoden erfolgt während der Titanabscheidung auch eine Passivierung durch Aluminium- und Titanhydroxyd, wobei das Flächenbedeckungsgesetz von Müller-Machu erfüllt ist. Die Stromausbeuten sind nur gering, sie übersteigen 30% nicht, sind aber weit größer als dies mit anderen Titansalzlösungen bisher möglich war.An Zinkkathoden fehlt die Passivierung, daher ist der Anteil an metallischem Titan im Niederschlag größer als an Aluminium. Anhand von Mikrophotos wird der Einfluß von Zusätzen wie Gelatine, Thiobarnstoff u. dergl. aufgezeigt, welche die Bildung von Hydroxyd und Oxyd im Niederschlag unterdrücken. Die Herstellung dickerer Titanniederschläge, frei von Oxyden, bereitet noch Schwierigkeiten.
    Additional Material: 29 Ill.
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  • 39
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 41-42 
    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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  • 40
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 43-48 
    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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  • 41
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 49-56 
    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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  • 42
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 57-57 
    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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  • 43
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 57-57 
    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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  • 44
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 57-59 
    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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  • 45
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 60-62 
    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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  • 46
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 62-64 
    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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  • 47
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 64-64 
    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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  • 48
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 64-64 
    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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  • 49
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. I 
    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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  • 50
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 65-65 
    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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  • 51
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 70-73 
    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: Contribution to the Development of Neoprenes for the Protection or Chemical InstrumentsThe process of coating equipment with prevulcanised Neoprene plates as ex- plained in its various stages. In addition, seven cases are described in which such coatings have been found satisfactory in practice.
    Notes: Das Verfahren der Auskleidung von Apparaten mit vorvulkanisierten Neoprene-Platten wird in seinen einzelnen Stufen erläutert. Anschließend werden 7 Fälle beschrieben, in denen sich diese Auskleidungen bewährt haben.
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  • 52
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 66-70 
    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: Practical Experiences in the Corrosion Behavior of Zinc PaintsGeneral survey of zinc paints.Conditions of technical application.Preliminary treatment of iron surfaces.Comparison of the test results of various dust paints by different testing methods.Report on experiences with zinc dust paints in steel construction building, open air constructions and in steel sheet working industries.
    Notes: Allgemeines über Zinkanstrichmittel; Verarbeitungstechnische Erfordernisse; Vorbehandlung der Eisenoberfläche.Vergleichende Gegenüberstellung von Testergebnissen mit unterschiedlichen Zinkstaubfarben nach verschiedenen Testverfahren.Praktische Erfahrungen mit Zinkstaubfarben im allgemeinen Stahlhochbau, bei Freiluftkonstruktionen und in der Stahlblech-verarbeitenden Industrie.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 74-77 
    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: High Temperature Corrosion in Petrol Refining by Sulfur CompoundsAt temperatures above 260°C only stainless, highly alloyed steels resist the attack of the most corrosive agent in petrol refining which is hydrogen sulfide. For high temperature corrosion by hydrogen sulfide, the influences of the duration of wear, the concentration of the hydrogen sulfide, the pressure, the properties of the refined petrol and the quality of the steel are of essential importance besides of the effects of temperature. The author reports on last years investigations in BP-research station on the corrosion of stainless steels by hydrogen sulfide at high temperatures. The corrosion of the surface, the inter-crystalline corrosion and the stress corrosion of steels are discussed in detail.
    Notes: Dem Angriff des wesentlichsten korrosiven Agens in Erdölraffinerien, dem Schwefelwasserstoff, bei hohen Temperaturen (über 260°C) widerstehen praktisch ausschließlich rostfreie, hochlegierte Stähle. Bei der Hochtemperatur-Korrosion durch Schwefelwasserstoff sind neben der Temperatur auch Beanspruchungsdauer, Schwefelwasserstoff konzentration, Druck, Beschaffenheit des zu raffinierenden Öles und die Stahlqualität von Einfluß. Verfasser berichtet über die in den letzten Jahren in der BP-Research Station durchgeführten Untersuchungen über die Korrosion von rostfreien Stählen durch Schwefelwasserstoff bei hohen Temperaturen, wobei allgemeine Oberflächen-korrosion, interkristalline Korrosion und Spannungskorrosion der Stähle eingebend behandelt werden.
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  • 54
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: New Investigations into Hydrogen Adsorption and Dissolved IronThe solution processes of iron in n HCl were investigated and a correlation was found between the quantity of hydrogen absorbed in the iron and the rate at which the metal dissolved. A dynamical saturation equilibrium was established in the interior of the metal. From this the significance of partial reactions can be derived and the action of inhibitors explained.
    Notes: Es wurden die Auflösungsvorgänge von Eisen in In-HCL untersucht und ein Zusammenhang zwischen der Menge des vom Eisen aufgenommenen Wasserstoffs und der Auflösungsgeschwindigkeit des Metalls gefunden. Es stellt sich dabei ein dynamisches Sättigungsgleichgewicht im Innern des Metalls ein. Daraus läßt sich die Bedeutung der Teil-Reaktionen ableiten und das Eingreifen von Inhibitoren erklären.
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  • 55
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Investigations of Pitting on Highly Alloyed Austenitic Chrome Nickel Steels and Ferritic Chrome Steels in Aqueous Solutions Containing HalidesTbe application of stainless steels in aqueous solutions containing halides is limited.The authors show that it is not the corrosion potential, determined by means of the generally applied test in a 10 pct. FeCl3-solution, but the slope of the potential vs. current density as a electrochemical data which indicates the sensitivity to pitting.The K3[Fe(CN)6]-test has proved to be a good quick method. By means of this method pitting is indicated as a active passive reaction.Pitting occurs only at potentials within a certain range which can be determined from a current density-voltage curve.In a 5 pct. sulfuric acid containing air, at room temperature the uniform transpassive dissolution of steel takes place only. In sulfuric acid solutions containing chlorides steel is corroded uniformly in its active state or by pitting but not transpassively. An addition of nitrate to such a solution inhibits pitting but increases the transpassive corrosion.
    Notes: Die Einsatzmöglichkeit der chemisch beständigen Stähle in halogenidhaltigen, wäßrigen Medien wird durch die Erscheinung der Lochfraßkorrosion eingeschränkt.Es wird gezeigt, daß bei der allgemein üblichen Prüfung in einer 10%igen FeCl3-Lösung für die Lochfraßanfälligkeit nicht das Korrosionspotential, sondern der Polarisationswiderstand als elektrochemische Meßgröße kennzeichnend ist.Als praktisches Schnellprüfverfahren hat sich der K3[Fe(CN)6]-Test bewährt. Mit Hilfe dieser chemischen Indikation wird der Lochfraß-Mechanismus als Aktiv-Passiv-Reaktion bewiesen. Das Auftreten der Lochfraßkorrosion ist an einen gewissen Potentialbereich gebunden, der durch Messung der Stromdichte-Potential-Kurve bestimmt werden kann.In reiner lufthaltiger 5%iger Schwefelsäure ist bei Raumtemperatur nur die gleichmäßig transpassive Stahlauflösung möglich. In chloridhaltiger Schwefelsäure kann der Stahl gleichmäßig aktiv oder durch Lochfraß, dagegen nicht transpassive korrodieren. Durch einen Nitratzusatz zur chloridhaltigen Schwefelsäure wird die Lochfraßkorrosion zugunsten der transpassiven Korrosion inhibitiert.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 106-110 
    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 10 (1959), S. 86-91 
    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 Photo-Chemistry of Metallic Copper and its Influence on the Velocity of the Dissolution of Copper as ElectrodeBy etching copper with a mixture of nitric and hydrochloric acid, a sensitive layer is formed which is blackened according to the duration of the exposion to light. An exposion by means of a 6,7 V-incandescent lamp at a distance of 10 cm from the copper surface generates a spot of 1,75 cm2 surface. Three discontinuities occur in certain intervals. The intensity of the reflexion was measured by means of a photoelectric cell and a mirror-galvanometer. Increase of temperature causes a decrease of the velocity of blackening the sensitive layer. Observing the influence of light upon the velocity of the dissolution of copper we obtained a typical dependance of the velocity of corrosion on the photochemical reaction on the copper surface.
    Notes: Durch Ätzung von Kupfer mit einem HNO3-HCl-Gemisch entsteht eine photoaktive Kupferschicht, die nach Belichtung eine zeitlich abhängige Schwärzung aufweist. Bei der Belichtung mit einer 6,7 V-Glühlampe in einem Abstand von 10 cm wird auf der Kupferoberfläche ein Lichtfleck von etwa 1,75 cm2 gebildet. In bestimmten Zeitintervallen treten sodann drei Diskontinuitäten auf. Die Intensität der Reflexion wurde mit Photozelle und Spiegelgalvanometer registriert. Die Erhöhung der Temperatur führt zur Verminderung der Schwärzungsgeschwindigkeit der photoaktiven Schicht.Die Beobachtungen über den Einfluß des Lichtes auf die Auflösungsgeschwindigkeit des Kupfers in Elektrolyten ergaben eine typische Abhängigkeit der Korrosionsgeschwindigkeit von der an der Kupfer-Oberfläche stattgefundenen Reaktion.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 111-115 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 116-121 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 122-122 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 121-122 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Investigations on the Corrosion Behavior of Aluminum and Aluminum Alloys upon Organic and Inorganic BasesThe article presents a comparison of the corrosive effects of organic and inorganic bases upon aluminium materials by means corrosion tests carried out at a temperature of 20°C for 73hrs. The aggressivity of the bases investigated decreases in the order of sodium hydroxide, methylamine, ethylamine, n-butylamine, ammonia, triethanolamine, sodium carbonate, calcium hydroxide, hydrazine. The sensitivity to corrosion of the materials decrease in the order of pure aluminium A1 99,3, purest aluminium Raffinal raf W(more than 99,99% Al) anticorodal Ac B, Avional Av-23 V, Perunal Pu V and Peraluman Pe-30 W. For every mixture of a base and water, there is a critical concentration at which the intensity of the attack reacher its maximum. High concentrated bases cause but low corrosion and anhydrous bases are fairly inactive. There is no destinct relationship between the corrosion behavior of the bases and their pH-values resp. their electric conductivity.
    Notes: In der vorliegenden Abhandlung wird auf Grund von bei 20°C durchgeführten 73stündigen Korrosionsversuchen mit verschiedenen Aluminiumwerkstoffen die aluminiumangreifende Wirkung organischer Basen mit der anorganischer verglichen. Die Aggressivität der untersuchten Basen nimmt in der anorganischer verglichen. Die Aggressivität der untersuchten Basen nimmt in der Reihenfolge Natriumhydroxyd, Methylamin, Aethylamin, n-Butylamin, Ammoniak, Triäthanolamin, Natriumcarbonat, Calciumhydroxyd, Hydrazin ab. Die Korrosionsfälligkeit einzelner Werkstoffe vermindert sich entsprechend der Reihe Reinaluminium Al 99,3, Reinstaluminium Raffinal Raf W (über 99,99% Al), Anticorodal Ac B, Avional Av-23 V, Perunal Pu V und Peraluman Pe-30 W. Bei jedem Gemisch Base/Wasser besteht eine kritische Konzentration, bei welcher die Intensität des Angriffs auf Aluminium ein Maximum erreicht. Sehr konzentrierte Basen wirken nur ganz schwach, wasserfreie Basen kaum aluminiumangreifend. Zwischen den Korrosionseigenschaften der einzelnen Basen und ihrem pH-Wert bzw. ihrer elektrischen Leitfähigkeit bestehen keine eindeutigen Zusammenhänge.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 122-122 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 123-127 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 127-137 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 138-138 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 139-139 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 139-141 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 141-144 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. VI 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959) 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 711-713 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 727-727 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959) 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 736-736 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 761-767 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: A theory on the complementing process in phosphating baths(Formation rate of secondary cover layers on metals)Secondary cover layers are deposited on metals from saturated solutions if the equilibrium of the solution is disturbed by corrosion on the metal surface. The rate of corrosion and the rate at which the layer is formed are compared, using the phosphate treatment of iron as an example. With this process, the quotient of the HṠ consumed and the iron dissolved is governed by the stoichiometry of the oxidation reaction concerned. The quotients of the HṠ consumed and the quantity of the zinc phosphate deposit can be calculated if all reactions are diffusion controlled. It is thus assumed that the crystal nuclei are formed rapidly, and that equilibria between zinc and phosphoric acid in the solution remain adjusted upto the metal surface. This theory is confirmed experimentally. It serves to indicate and to determine the composition of complementry solution by means of which the baths can be kept stable.
    Notes: Sekundäre Deckschichten scheiden sich aus gesättigten Lösungen auf Metallen ab, wenn an der Metalloberfläche das Lösungsgleichgewicht durch Korrosion gestört wird. Die Geschwindigkeiten von Korrosion und Abscheidung werden am Beispiel der Phosphatierung von Eisen verglichen. Dabei ist der Quotient aus verbrauchtem H und gelöstem Eisen durch die Stöchiometrie der jeweiligen Oxydationsreaktion bedingt. Der Quotient aus verbrauchten H und Menge des Zinkphosphatniederschlags ist zu berechnen, wenn alle Reaktionen transportbestimmt sind. Es wird also angenommen, daß die Gleichgewichte zwischen Zink und Phosphorsäure in der Lösung bis hin zur Metalloberfläche eingestellt bleiben. Die Theorie wird experimentell bestätigt. Sie dient dazu, um Bäder mit optimalen Eigenschaften anzugeben. Ferner erlaubt sie, die Zusammensetzung von Ergänzungslösungen zu berechnen, mit denen die Bäder stationär gehalten werden können.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 776-778 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 787-787 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 797-800 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 422-425 
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: New investigations on vapor phase inhibitorsIn connection to basic investigations on the protection against corrosion of metal surfaces by VPI, the authors tested the effects of some VPI upon the stability in storage of gray iron in air of 100 pct. relative humidity.Interpreting the results of different tests the authors accentuate the necessity of minimum quantities of VPI to achieve a protective effect.Tests with VPI impregnated wrapping paper in touch with the metal surface show that this method may be applied to cast iron also. Furthermore the effects of some VPI upon different metal surfaces at alternating temperatures were determined. The specimens, arranged in varying positions and different distances from the inhabitors, were subjected to transport conditions. The importance of these factors for the protective value of VPI is turned out.
    Notes: Im Anschluß an ihre Grundlagen-Forschungen auf dem Gebiete des Korrosionsschutzes metallischer Oberflächen durch Dampfphasen-Inhibitoren untersuchten die Verfasser die Wirkung einiger V. P. I. auf die Lagerbeständigkeit von Graugußteilen in Luft von 100% relativer Feuchtigkeit.Bei Auswertung der bei verschiedenen Untersuchungen erhaltenen Daten wird darauf hingewiesen, daß zum Schutz von Gußstücken ausreichende V. P. I.-Mengen vorhanden sein müssen.Bei Versuchen, bei denen die auf das Verpackungspapier aufgetragene V. P. I. mit den Metalloberflächen in Berührung standen, ergab sich, daß diese Schutzart auch bei Gußeisen anwendbar ist. Weiter wurde die Wirkung einiger V. P. I. gegenüber verschiedenartigen Metalloberflächen bei wechselnden Temperaturen quantitative ermittelt. Die der Einwirkung der V. P. I. ausgesetzten Prüflinge wurden in verschiedenen Lagen und Entfernungen vom Inhibitor exportiert; die Bedeutung dieser Faktoren für den Schutzwert der V. P. I. wurde deutlich herausgestellt.
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  • 85
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 454-457 
    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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  • 86
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 463-463 
    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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  • 87
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 429-442 
    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: Influence of structural factors on the corrosion of stainleaa steelDepending on the influence of their surroundings, austenitic stainless steels show great differences in their corrosion behaviour; they may be corrosion-proof, or passive in corrosive oxidants, or they may, in acid solutions, corrode as rapidly as iron and steel.This behaviour is directly connected with the phenomenon of passivity, or with the influence exerted, by virtue of its structure, by the passive state of the surface of stainless on the occurrence, intensity and type of corrosion. The author has investigated this effect of the surface structure in numerous tests, varying the composition and pre-treatment of the steels (machining, heat treatment, tempering, sensitivisation), the exposure times and oxidants (using boiling nitric acid), examining the influence of the grain size on intergranular corrosion, and determining the effect of clod drawing on the corrosion resistance of stainless steels. The article contains a detailed report about these tests, and the results are illustrated by 22 reproductions of microphotographs and of pictures obtained by the electron microscope.
    Notes: Austenitische rostfreie Stähle weisen stark unterschiedliches Korrosionsverhalten auf, je nachdem, welchen umgebenden Einflüssen sie ausgesetzt werden, sie können korrosionsfest oder passiv in korrodierenden Oxydationsmitteln sein oder können in sauren Lösungen ebenso schnell korrodieren wie Eisen und Stahl.Dieses Verhalten hängt direkt mit dem Phänomen der Passivität zusammen bzw. der Wirkung, die der passive Zustand der Oberfläche der rostfreien Stähle seiner Struktur nach auf das Auftreten, den Grad und die Art der Korrosion ausübt. Der Verfasser hat diese Wirkung der Oberflächenstruktur in zahlreichen Versuchen untersucht, er hat Zusammensetzung und Vorbehandlung der Stähle verändert  -  durch Polieren, Warmbehandlung, Temperung, Sensibilisierung  - , die Exponierungszeiten und Oxydationsmittel verändert  -  durch Verwendung von kochender Salpetersäure, Chromsäure oder Salzsäure  -  und die Einwirkung der Korngröße auf die intergranulare Korrosion sowie den Effekt der Kaltverformung auf die Korrosionsfestigkeit der rostfreien Stähle untersucht. Er gibt im Artikel einen ausführlichen Bericht über alle diese Versuche und belegt die erhaltenen Resultate durch 22 Mikrophotographien und elektronenmikroskopischen Aufnahmen.
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 470-470 
    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 10 (1959), S. 470-470 
    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 10 (1959), S. 476-476 
    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 10 (1959), S. 470-475 
    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 10 (1959), S. 547-555 
    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 systematology of the corrosion of metals in soil I. IronOn the strength of laboratory and field tests, the corrosion behaviour of iron in soil is discussed as a case of contact corrosion. In a water-saturated soil, the size of the anodic spots on the surface of the iron is determined by the size of the soil particles, and the contact zone at the iron surface acts as a cathodic spot. A slight additional diffusion of oxygen leads to a cathodic control of the corrosion process of iron in the soil. A higher concentration of oxygen in the soil results in an anodic control of the corrosion process of iron. In the transition zone (unsaturated-saturated), an alternation occurs between the active and passive state of the iron in the soil so that a mixed control of the corrosion process can be encountered.In a water-saturated soil, there is a linear relationship between the proportion of the cathodic and anodic zones on the one hand, and the size of the soil particles on the other hand. In a system not saturated with water, an exponential function \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm F}_{\rm 4} {\rm = A (1 - e}^{{\rm - k2}} \cdot {\rm G}_{\rm p} {\rm)} $$\end{document} applies, where A and k are constants. Gp is the diameter of the glass globules, and Fa the size of the anodic zones.The relationship between the corrosion rate g and the water content of the soil, w, can be expressed by the equation \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm F}_{\rm 4} {\rm = A (1 - e}^{{\rm - k2}} \cdot {\rm G}_{\rm p} {\rm)} $$\end{document} Where K, b and c are constants.The authors discuss how the results of the field tests can be interpreted by the alternation of the active and passive behaviour of the iron, depending on the climatic conditions.
    Notes: Das Verhalten des Eisens im Erdboden wird an Hand von Labor- und Naturversuchen als ein Fall der Kontaktkorrosion besprochen. In einem an Wasser gesättigten Boden bestimmt die Größe der Bodenteilchen die Größe der anodischen Stellen der Eisenoberfläche. Für ein an Wasser gesättigtes System wird die Berührungszone an der Eisenoberfläche zur kathodischen Stelle. Geringe Sauerstoffnachdiffusion führt zu einem kathodisch kontrollierten Korrosionsvorgang des Eisens im Boden. Höhere Sauerstoff-konzentration im Boden führt zu einem anodisch kontrollierten Korrosionsvorgang des Eisens. Im Übergangsgebiet (ungesättigt-gesättigt) erfolgt ein Wechsel zwischen aktivem und passivem Zustand des Eisens im Boden und dabei wird die Korrosion anodisch oder kathodisch gesteuert.In einem an Wasser gesättigten Boden besteht eine lineare Funktion zwischen dem Verhältnis der kathodischen und anodischen Bezirke und der Größe der Bodenteilchen. Für ein an Wasser ungesättigtes System gilt die Exponentialfunktion \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm F}_{\rm 4} {\rm = A (1 - e}^{{\rm - k2}} \cdot {\rm G}_{\rm p} {\rm)} $$\end{document} wobei A und k Konstante sind. Gp ist der Durchmesser der Glaskugeln und Fa die Größe der anodischen Bezirke.Die Abhängigkeit der Korrosions-geschwindigkeit g von Wassergehalt des Bodens w läßt sich durch die Formel \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm g} = K \cdot w^b \cdot {\rm e}^{{\rm cw}} $$\end{document} darstellen, wobei K, b und c Konstante sind.Weiter wird angegeben, wie die Naturversuche durch den Austausch des aktiven und passiven Verhaltens des Eisens in Abbängigkeit der klimatische Bedingungen zu deuten ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 647-650 
    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 10 (1959), S. 653-653 
    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 10 (1959), S. 661-661 
    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 10 (1959), S. 662-663 
    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 10 (1959), S. XXVI 
    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 10 (1959), S. 666-668 
    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: Kinetics of the dissolution of copper, and graphic presentation of its performance by means of corrosion current pH diagramsThe dissolution of electrolylic copper in electrolytes has been investigated by observing the corrosion current io. The dissolution rate in 0,25 n-NaCl and 0,25 nKH2PO4 is governed by the exponential relationships io = 0,20·t1,67 and io = 0,08 · t0,695, respectively. The dissolution rate in 0,5 n-KNO, is governed by the linear relation io = 0,08 · t, where t is the duration of the test. Thc present paper is exclusively concerned with the graphic presentation of the performance af electrolytic copper and brass 70 in the form of the corrosion current/PH diagram.
    Notes: Der Auflösungsvorgang des Elektrolytkupfers in Elektrolyten wurde anhand des Korrosionsstroms i0 verfolgt. Für die Auflösungsgeschwindigkeit in 0,25 n-NaCl und 0,25 n-KH2PO4 gelten die exponentiellen Beziehungen: i0 = 0.20 . t1.67, bzw. i0 = 0.08 . t0.695, und in 0.5 n-KNO3 gilt die lineare Beziehung i0 = 0.08 . t, wobei t die Versuchsdauer bedeutet.Der vorliegende Beitrag bringt die graphische Darstellung der Korrosion des Elektrolytkupfers und Messings M 70 in Form des Korrosionsstrom-pH-Diagramms.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 668-681 
    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: Investigations on filiform corrosion of varnished steel platesFiliform corrosion is a special type of atmospheric corrosion which is mainly encountered on varnished steel sheeting. The attack begins with the formation of drops of electrolyte, e. g., at hygroscopic impurities of the metal surface, and remains strictly limited to the small volume of these drops. The drops which usually have a distinct V-shape, are pushed along on the metal surface below the varnish by solid corrosion products formed there.The results of tests concerning the dependency of filiform corrosion on the humidity of the air, on the thickness of the varnish, on the nature of polluting salt particles, and on the pretreatment accorded to the steel sheeting lead to the assumption that the salt concentration in the electrolyte drop is in equilibrium with the surrounding atmosphere and that the V-shaped phase boundary, formed by the continually growing rust, constitutes a filler which can only be passed by 0,. At this filter bivalent iron is oxidized to trivalent iron and is stabilized in V-shape by conditions which are qualitatively governed by the conversion balance of the reaction in the drop and by the surface tension between drop and varnish skin. The speed of the reaction is ultimately governed by the partial pressure of the O2 in the atmosphere.
    Notes: Die Filigrankorrosion ist eine besondere Art der atmosphärischen Korrosion, die bevorzugt auf lackierten Stahlblechen auftritt. Der Angriff beginnt mit der Ausbildung von Elektrolyttropfen, z. B. an hygroskopischen Verunreinigungen der Blechoberfläche und bleibt auf das kleine Volumen dieser Tröpfchen scharf begrenzt. Abgeschiedene feste Korrosionsprodukte schieben die Tröpfchen, die gewöhnlich eine auffällige V-Form haben, unter dem Lack auf der Blechoberfläche voran.Nach dem Ergebnis von Versuchen über die Abhängigkeit der Filigrankorrosion von Luftfeuchtigkeit, Lackdicke, naturverunreinigender Salzpartikel und Blechvorbehandlung wird vermutet, daß die Elektrolytropfen bezüglich ihrer Salzkonzentration im Gleichgewicht mit der umgebenden Atmosphäre stehen und daß die V-förmige Phasengrenze, aus dem ständig aufwachsenden Rost gebildet, eine nur für O2 durchlässige Membran darstellt. Diese Membran ist der Ort der Oxydation von zwei- zu dreiwertigem Eisen und wird als V durch Bedingungen stabilisiert, die sich qualitativ aus der Umsatzbilanz der Reaktion im Tropfen und der Oberflächenspannung zwischen Tropfen und Lackhaut ergeben. Für die Reaktion ist letztlich der O2-Partialdruck der Atmosphäre geschwindigskeitsbestimmend.
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