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  • Polymer and Materials Science  (938)
  • General Chemistry  (516)
  • Cell & Developmental Biology  (123)
  • 1970-1974
  • 1960-1964  (1,577)
  • 1910-1914
  • 1961  (1,577)
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  • 1970-1974
  • 1960-1964  (1,577)
  • 1910-1914
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  • 1
    Electronic Resource
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 16-18 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 6 Ill.
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  • 2
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 31-31 
    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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  • 3
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 107-110 
    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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  • 4
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 115-121 
    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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  • 5
    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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  • 6
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961) 
    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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  • 7
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 154-156 
    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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  • 8
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 157-161 
    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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  • 9
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 179-180 
    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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  • 10
    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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  • 11
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 68-68 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 12
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 13
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 201-202 
    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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  • 14
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 204-204 
    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 12 (1961), S. 206-208 
    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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  • 16
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 209-215 
    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 behaviour of malleable cast iron under the influence of corrosionWhite and black malleable cast iron is examined in regard to its behaviour in the presence of different inorganic and organic agents. The tests are designed for long-term laboratory observations and, in particular, for the determination of the corrosion behaviour under conditions which, as closely as possible, resemble those encountered in practice, Reactions to wet steam, combustion gases, etc. are discussed. The influence of pre-corrosion, e.g. caused by sulphuric acid, on tensile strength and strain is measured. In this connection, it has been possible to detect important relationships at the untreated and at the finished material. Particularly impressive is the relationship between fatigue impact strength and pre-corrosion, By way of comparison, measurements have also been carried out on grey cast iron, cast steel and steel. Finally, the influence of copper (up to about 3 per cent.) in different types of water is examined by a long-term test.
    Notes: Weißer und schwarzer Temperguß wird in seinem Verhalten gegen verschiedene anorganische und organische Agentien untersucht. Die Versuche sind auf Langzeit-Laborversuche, vor allem aber auf praxisnahes Korrosionsverhalten eingestellt. Auf das Verhalten von Naßdampf und Verbrennungsgasen u.a. wird eingegangen. Der Einfluß der Vorkorrosin z. B. durch Schwefelsäure, auf Zugfestigkeit und Dehnung wird gemessen. Dabei ließen sich am unbearbeiteten und bearbeiteten Werkstoff wichtige Zusammenhänge ermitteln. Besonders eindrucksvoll ist der Zusammenhang zwischen Dauerschlagfestigkeit und Vorkorrosion. Vergleichs-weise werden Messungen an GG, GS und St gegenübergestellt. Zum Schluß wird der Einfluß von Kupfer (bis etwa 3%) in verschiedenen Wässern (Langzeitversuch) ermittelt.
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  • 17
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 223-230 
    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 organic matter on the deposit rate and gloss of nickel coatings generated without currentAn investigation has been carried out into the effect of some organic compounds on the deposit rate and gloss of nickel coatings in the bath working without current. In this connection, both positive and negative catalytic effects are encountered. Most substances increase the gloss, and maxima occur in many cases. These maxima do not occur at the same concentration values as the maxima of the deposit weights. The best gloss was obtained by p-toluole sulphonamide which corresponds to a completely smooth nickel surface.The surface structure of the nickel coatings is governed by the interaction of different factors. Whilst the organic brightening agents generally, rather like inhibitors, reduce the metal deposit in proportion to the concentration of the compounds, the optimum gloss is encountered before the metal surface is completely covered with the brightener film, i.e. as long as a certain porosity still exists. Only when the diaphragm permits a constant rate of seed crystal formatin both parallel and perpendicular to the metal surface, does one obtain homogeneous lowcrystalline nickel crystals which are prerequisite to the formation of glossy metal deposits.
    Notes: Es wurde die Wirkung einiger organischer verbindungen auf die Niederschlagsmengen und den Glanz von Nickel-Überzügen aus dem stromlos arbeitenden Bade untersucht. Hierbei treten sowohl positive als auch negative katalytische Effekte auf. Die meisten Stoffe erhöhen den Glanz, wobei vielfach Maxima auftreten. Diese liegen nicht bei den gleichen Konzentrationswerten wie die Maxima der Niederschlagsgewichte. Den besten Glanz ergab p-Toluolsulfonamid, der einer völlig glatten Nickeloberfläche entspricht.Die Oberflächenstruktur der Nickel überzüge kommt durch Zusammenwirken verschiedener Faktoren zustande. Während die organischen Glanzbildner meist ähnlich wie Inhibitoren die Metallabscheidung proportional der Konzentration der Verbindungen vermindern, tritt das Optimum des Glanzes nicht bei einer vollkommenen Bedeckung der Metalloberfläche mit dem Film des Glanzbildners, also noch bei einer gewissen Porosität, ein, Nur wenn das Diaphragma ein gleichmäßiges Kristallwachstum, bei gleichzeitiger hoher Keimzahl sowohl parallel als auch senkrecht zur Metalloberfläche gestattet, entstehen homogene, kleine Nickelkristalle, welche die Bedingung für die Bildung glänzender Metallniederschläge sind.
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  • 18
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 150-154 
    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 passivity of silver-copper alloys in sodium cyanide solutionsThe passivity phenomena were investigated with two further Ag-Cu alloys 50/50 and 20/80 in different sodium cyanide solutions, with the aid of current density/potential curves. In this connection, the characteristic constants of the Müller-Machu relation, N and n, as well as the free pore surface of the different layers formed during passivation were determined.The passivation process always takes place in three stages. The composition of the different layers and their reaction mechanism are discussed in some detail.
    Notes: Die Passivitätserscheinungen wurden an zwei weiteren Ag-Cu-Legierungen 50/50 sowie 20/80 in verschiedenen Natriumcyanidlösungen an Hand der Stromdichte-Zeit-sowie Stromdichte-Potential-Kurven untersucht. Dabei wurden die charakteristischen Konstanten der Müller-Machu-Beziehung B und n sowie die freie Porenfläche der verschiedenen, während der Passivierung gebildeten Deckschichten berechnet.Die Passivierung geht stets in drei Stufen vor sich. Die Zusammensetzung der dabei auftretenden Deckschichten sowie der Reaktionsmechanismus wurden näher erörtert.
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  • 19
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 162-172 
    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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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 177-178 
    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 12 (1961), S. 197-197 
    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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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 140-140 
    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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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 148-150 
    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: Copper corrosion products on electric traction wiresOn the copper catenaries of electric railway, the three types of crystals of green copper patina are encountered, corresponding to basic copper chloride, nitrate and sulphate. Chloride is encountered in coastal areas, nitrate in mountain regions, and sulphate in industrial districts.
    Notes: Auf dem Kupfer-Fahrdraht elektrischer Eisenbahnen bilden sich die drei Kristallarten von grüner Kupferpatina. Sie entsprechen basischem Kupferchlorid, -nitrat und -sulfat. Das Chlorid findet sich am Meeresstrand, das Nitrat in der Gebirgsgegend und das Sulfat in Fabrikgegenden.
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  • 24
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 141-148 
    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: Nitric acid corrosion on highly alloyed steelsCorrosion tests in nitric acid up to 67 per cent. and at temperatures up to atmospheric boiling point have been carried out with steels of high chromium contents (25 to 30 per cent.) containing up to 1.64 per cent. carbon and, in some cases, also 20 per cent. nickel. The results were plotted in the form of iso-corrosion diagrams which can be used to predict the corrosion resistance was shown by a steel containing 0.1 per cent. C, 30 per cent. Cr, and 20 per cent. Ni. Even after heat treatment at 680° C, this steel does not show any intercrystalline corrosion when exposed to 50 and 67 per cent. nitric acid at boiling temperature.The results of these tests and the values for chromium steels discussed in the first part of the article were plotted, for HNO3 concentrations ranging from 30 to 67 per cent., at boiling temperature, to show the degree of corrosion on a logarithmic scale, as a function of the C and Cr contents on a decimal scale. The curves thus plotted were straight lines, i.e. the influence of carbon as well as chromium can be expressed by parabolas, rising with the concentration in the case of carbon, and falling with the concentration in the case of chromium. In the latter case, the part bonded with the carbon, which roughly corresponds to carbide (Cr3C) and amounts to 13 times the C content, must be deducted from the total chromium content.The high No content of 20 per cent. has no noticeable influence on the degree of corrosion. From a corrosion-chemical point of view, it is therefore immaterial whether the structure is of the ferrite or austenite type. The essential constituent is the free Cr content, the effect of which is governed by a parabolic law, and not by the previously much discussed n/8 Mol law.In plotting the effect of the carbon, one obtains three parabols which apply to the Cr contents of 13, 17 und 25 per cent., respectively. Below 0.1 per cent. C, the corrosion resistance is, in the main, exclusively governed by the Cr content.
    Notes: Mit hochchromhaltigen Stählen (25 bis 30% Cr) die Kohlenstoff bis zu 1,64% und teilweise auch 20% Ni enthielten, wurden zahlreiche Korrosionsversuche in Salpetersäure bis zu 67% und bei Temperaturen bis zu den atmosphärischen Siedetemperaturen durchgeführt. Aus den erhaltenen Zahlen wurden Beständigkeitsdiagramme mit Isokorrosionslininien gezeichnet, aus denen sich die Korrosionsbeständigkeit unter bestimmten Bedingungen für die einzelnen Stähle ablesen läßt. Am korrosionsbeständigsten erwies sich ein Stahl, der bei 0,1% C, 30 % Cr und 20% Ni enthielt. Dieser Stahl bekam auch nach einer thermischen Behandlung bei 680°C keine interkristalline Korrosion durch Salpetersäure 50% und 67% bei Siede-temperatur.Aus den Resultaten dieser Versuche und den Werten für Cr-Stähle aus dem ersten Teil der Arbeit wurde für Konzentrationen von 30 bis 67% HNO3 bei Siede-temperatur der Zusammenhang der Korrosion in logarithmischem Maßstab mit dem C-Gehalt im Dezimalmaßstab graphisch dargestellt. Esergaben sich gerade Linien, d, h, der Einfluß sowohl des Kohlenstoffes als auch des Chroms wurde durch je eine Parabel aus-gedrückt, für den Kohlenstoff mit der Konzentration steigend, für Chrom mit der Konzentration fallend. Beim Chrom ist vom Gesamtgehalt der an kohlenstoffgebundene Anteil abzuziehen, der etwa dem Carbid Cr3C entspricht und mit 13 × %C zu berechnen ist.Der hohe Ni-Gehalt von 20% hat auf die Höhe der Korrosion keinen merklichen Einfluß, und hieraus ergibt sich, daß es korrosionschemisch ohne Bedeutung ist, ob Ferrit oder Austenit im Gefüge vorliegt. Der wesentliche Bestandteil ist der ungebundene Cr-Gehalt, der nach einem parabolischen Gesetz wirksam wird, aber nicht nach dem früher viel diskutierten n/8 Mol-Gesetz.Bei der graphischen Darstellung des Einflusses des Kohlenstoffes ergaben sich drei Parabeln, die für die Cr-Gehalte 13%, 17% und 25% gelten. Unter 0,1% C ist für die Korrosionsbeständigkeit im wesentlichen nur noch der Cr-Gehalt entscheidend.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 346-350 
    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 12 (1961), S. 260-265 
    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 12 (1961), S. 360-361 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion protection in steel ConstructionRegular inspection of protective coatings is indispensable. Special attention should be paid to the particularly dangerous subsurface corrosion. If this has progressed considerably, it becomes necessary to carry out complete de-rusting. The first primer should exclusively consist of adhesive coatings. Disperse and highly concentrated red lead are equally adhesive. Where the weather is liable to change rapidly, special fast-drying varnishes are preferable. Phthalate resin binders are able to form ‘lead soaps’. Fast-dying primers can received the finishing coats earlier. It is only in the finishing coats that the chemical activity of white lead is sufficiently utilized. In connection with suitable binders, red lead primers are also suited for steel structures in water.
    Notes: Die fortlaufende Prüfung der Schutzanstriche ist unerläßlich. Die Unterrostung verdient ihrer Gefährlichkeit wegen besondere Aufmerksamkeit. Weit fortgeschrittene Unterrostung macht Total-Entrostung erforderlich. Für dem ersten Grundanstrich dürfen nur haftfeste Anstrichstoffe verwendet werden. Disperse und hochprozentige Bleimennige sind gleich haftest. Bei wechselhafter Witterung sind schnelltrocknende Spezial-Firnisse vorzuziehen. Phthalatharz-Bindemittel sind zur Bildung von „Bleiseifen“ befähigt. Rasch trocknende Grundierungen können schneller als sonst üblich mit Deckanstrichen versehen werden. Die chemische Aktivität des Bleiweiß kommt nur im Deckanstrich hinreichend zur Geltung. In Verbindung mit geeigneten Bindemitteln ist die Bleimennige-Grundierung auch für Stahlwasserbauten geeignet.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 368-368 
    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 12 (1961), S. 376-377 
    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 12 (1961), S. 383-403 
    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 12 (1961), S. 404-409 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 273-277 
    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: Minimum contents of alloying constituents required for the formation of oxide layers with high protective effect against oxidation at higher temperaturesFor the formation of an uninterrupted protective oxide layer of an alloying metal such as Al or Be in Cu or Fe, the concentration must be at least so high that the quantity of alloying metal reaching the surface through diffusion is sufficient to provide for the formation of the oxide concerned. Results of tests concerning the oxidation of Cu-Be alloys have shown that this condition. Though necessary, is not sufficient. Even with higher concentrations of the alloying metal, both the latter and the base metal can be oxidized simultaneously if the base metal oxide contains mobile oxygen ions, or if there is, between a compact oxide layer of the base metal and the initial alloy, a porous zone composed of the oxides of both metals, with migration of oxygen molecules in pores. In the same way, it is possible to interpret the results of tests carried out by other authors concerning the oxidation of Cu-Zn and Cu-Ni alloys and the sulphidization of Cu-Al, Cu-Zn and Ag-Zn alloys
    Notes: Für die Bildung einer lückenlosen schützenden Oxydschicht eines Zusatzmetalls wie Aluminium oder Beryllium in Kupfer oder Eisen muß dessen Konzentration mindestens so hoch sein, daß die durch Diffusion an die Oberfläche gelangende Menge des Zusatzmetalls den Verbrauch Diffusion an die Oberfläche gelangende Menge des Zusatzmetalls den Verbrauch für alleinige Bildung des betreffenden Oxyds deckt. An Hand von Versuchsergebnissen für die Oxydation von Cu-Be-Legierungen wird gezeigt, daß die Bedingung zwar notwendig aber nicht hinreichend ist. Auch bei höheren Konzentrationen an Zusatzmetall können Grundmetall und Zusatzmetall simultan oxydiert werden, wenn entweder im Oxyd des Grundmetalls Sauerstoffionen beweglich sind oder zwischen einer kompakten Oxydschicht des Grundmetalls und er Ausgangslegierung eine poröse Zone der Oxyde beider Metalle mit Wanderung von Sauerstoffmolekeln in Poren vorhanden ist. In gleicher Weise können Versuchsergebnisse anderer Autoren für die Oxydation von Cu-Zn udn Cu-Ni-Legierungen und für die Sulfidierung von Cu-Al, cu-Zn und Ag-Zn-Legierungen gedeutet werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 259-259 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 300-303 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 322-325 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Improving the corrosion resistanceCopper and ist alloys are notorious for their excellent resistance in aqueous and gaseous media. Admittedly, however, there are no materials based on copper which can, in the strict sense, be regarded as capable of passivation. The corrosion resistance of this group of materials is, in fact, the result of the electropositive normal potential of copper, and of the existence, on the metal surface, of dense covering layers difficult to dissolve. But the applicability even of materials containing copper is impaired by corrosion phenomena such as flaking and selective and intercystalline corrosion. The examples of internal and external oxidation, of the dezincking of brass, and of stress corrosion are used to demonstrate how these specific forms of corrosion can be countered by the addition even of small quantities of a further alloying component.
    Notes: Kupfer und seine Legierungen besitzen bekanntlich in wässerigen und gasförmigen Medien eine ausgezeichnete Beständigkeit. Allerdings bestehen auf der Basis Kupfer keine als passivierbar im strengen Sinne zu bezeichnenden Werkstoffe. Die Korrosionbeständigkeit dieser Werkstoffgruppe ist vielmehr eine Auswirkung des edlen Normalpotentials von Kupfer sowie der Existenz schwerlöslicher und dichter Deckschichten auf der Metalloberfläche. Korrsionsvorgänge wie Verzunderung, selektive und interkristalline Korrosion beeinträchtigen jedoch die Einsatzmöglichkeiten auch von kupferhaltigen Werkstoffen. Am Beispiel der inneren un äußeren Oxydation, der Entzinkung von Messing und der Spannungskorrosion wird dargelegt, wie durch Zusätze schon geringer Mengen einer weiteren Legierungskomponente diese spezifischen Korrosionsformen bekämpft werden können.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 438-445 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 451-458 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 345-346 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961) 
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    Description / Table of Contents: Some noteworthy advice on the prevention of incrustationOn the strength of American and British publications, the compositions, the composition and the form of deposition of the incrustation formed by the evaporation of sea water are surveyed, and reference is made to an agent, developed by the British Navy, which is designed to prevent such incrustation.In addition, mention is made of some more recent structural suggestions which reduce the quantity of incrustation. Finally, an American publication is quoted where unsuitable suggestions are sharply criticized.
    Notes: Auf Grund amerikanischer und englischer Veröffentlichungen wird über die Zusammensetzung und Abscheidungsform des bei der Verdampfung von Meerwasser entstehenden Kesselsteins berichtet und auf ein in der englischen Kriegsmarine entwickeltes Mittel zur Verhütung solcher Abscheidungen hingewiesen.Darüber hinaus werden neuere konstruktive Vorschläge genannt, die zu einer Verminderung des Kesselsteins führen und schließlich auch auf eine amerikanische Publikation aufmerksam gemacht, in welcher abwegige Vorschläge scharf kritisiert werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 369-372 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 412-412 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 529-530 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 532-532 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. XIV 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 550-560 
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    Description / Table of Contents: Material displayed at the “Achema 1961”The great extent of this year's “Achema” precludes an exhaustive description. The present report must therefore be confined to brief particulars designed to facilitate orientation. Pride of place is given to irons and steels which continue to be the most important materials in the chemical industry. The next section is devoted to non-ferrous metals and alloys. Partly due to the progress in nuclear technology and space research, this field, in particular, shows a good deal of progress and many innovations. In connection with the discussions of ceramics and glass the opportunity is taken to discuss “Cermets”, glass fibers, enamellings, etc. Rubber and plastics provide a highly topical and important sector of the “Achema”, and are taken into account on many of the stands. A further chapter dealing with natural and chemical fibers is followed by one headed “Other materials” which combines all the special features displayed at the “Achema” in regard to wood, paper, cardboard, graphite, chemicals, basic materials, etc. The brief survey is concluded by short references to surface protection, measuring methods and testing apparatus.
    Notes: Der sehr große Umfang der Achema schließt eine erschöpfende Darstellung aus. Auch der vorliegende Bericht beschränkt sich daher auf kurze Angaben, die nur den Zweck haben, den Überblick zu erleichtern. Es werden zunächst Eisen und Stähle behandelt, die nach wie vor die wichtigsten Baustoffe der chemischen Industrie bilden. Der nächste Hauptabschnitt ist den anderen Metallen und Legierungen gewidmet. Gerade auf diesem Gebiete gibt es, z. T. veranlaßt durch den Aufschwung von Kerntechnik und Weltraumforschung, viele Fortschritte und Neuerungen. Die Besprechung von Keramik und Glas als Werkstoff bietet Gelegenheit, auch auf Cermets, Glasfasern, Emaillierungen oder dgl. einzugeben. Mit Kautschuk und Kunststoffen ist ein sehr aktueller und wichtiger Sektor de Achema erreicht, der auf vielen Ausstellungsständen berücksichtigt worden ist. Auf ein weiteres Kapitel über natürlich und Chemie-Fasern folgt ein solches, in dem unter dem Oberbegriff „sonstige Werkstoffe“ alles das vereinigt ist, was hinsichtlich Holz, Papier, Pappe, Kohle, Graphit, Chemikalien, Grundstoffen usw. dem Besucher der Achema besonders in die Augen gefallen ist. Abschließend geht das Sammelreferat in Stichworten auf Oberflächenschutz, Meßmethoden und Prüfgeräte ein.
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    Description / Table of Contents: The corrosion behavior of cast iron, with special reference to processing technologyThe author discusses the special characteristics of cast materials, especially those of un-alloyed and low-alloyed cast iron. As regards the latter, the progress achieved during the last fifty years is briefly reviewed (e.g. “Meehanite” and cast iron with spherical graphite). The significance and the structure of the graphite coat are discussed. Examples are then given of the application of unalloyed and low-alloyed cast iron in processing technology, with special reference to the handling of acid and alkaline reaction mixtures. Tests with oleum acting on ten different types of cast iron at room temperature did not show the kind of destruction described in earlier publications.
    Notes: Es wird auf die besondere Eigenart der Gußwerkstoffe, insbesondere des unlegierten und niedrig legierten Gußeisens, eingegangen. Bei diesem werden die Fortschritte der letzten 50 Jahre kurz gestreift (z.B. „Meehanite“ und Gußeisen mit Kugelgraphit). Auf die Bedeutung und das Gefüge der Graphitierungsschicht wird eingegangen. Dann werden Anwendungsbeispiele von unlegierten und niedriglegierten Gußeisen in der Verfahrenstechnik angeführt, wobei die Handhabung saurer und alkalischer Reaktionsgemische besprochen wird. Bei der Einwirkung von Oleum auf 10 Gußeisensorten von Raumtemperatur konnten Zerstörungen, wie sie in früheren Arbeiten besprochen worden sind, nicht gefunden werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 591-592 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 592-592 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 593-593 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 594-595 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961) 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 614-619 
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    Description / Table of Contents: Cathodic corrosion protection in the Lacq areaImportance of leakage currents caused by railway electrification (1500 Volt d.c.). Corrosion protection for the different lines of the power grid and supply network, production shafts and factories. Measures taken to obtain a uniform current distribution of the substations (polarised drainage; current removal).
    Notes: Bedeutung der vagabundierenden Ströme, eine Folge der Elektrifizierung der Eisenbahnlinien (1500 Volt Gleichspannung). Korrosionsschutz der verschiedenen Leitungen des Sammel- und Versorgungsnetzes, der Produktionsschächte und Fabrikanlagen. Maßnahmen zur Erzielung einer gleichmäßigen Stromverteilung der Unterstationen (polarisierter Drainage, Strombeseitigung).
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 637-644 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 666-666 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 582-585 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 595-596 
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    Description / Table of Contents: The influence of alloying admixtures on the corrosion behaviour of titaniumMeasurements of potentials on welded titanium and titanium oxygen alloys have shown that, with increasing oxygen content of the weld or alloy, the potential is shifted to the electropositive side provided that the oxygen content does not exceed 0.6 per cent. This does not affect the corrosion rate of the titanium oxygen alloys. With higher oxygen contents, however, corrosion in boiling 2½ pC. sulphuric acid is increased. But as such corrosion is, in any case, already high, this fact is, in practice, without interest. Conditions are similar with titanium nitrogen alloys. The higher degree of corrosion here encountered with welded specimens could be ascribed to the effect of heat treatment which causes an inadmissibly high degree of corrosion even with non-welded specimens. Oxidizing solutions do not even attack titanium weld joints. By adding 0.2 pC or more Pd, the corrosion resistance in non-oxidizing media can be improved. With the aid of potential measurements and current potential curves, the corrosion behaviour of Ti Pd alloys is explained.
    Notes: Potentialmessungen an geschweißtem Titan und an Titan-sauerstoff-Legierungen zeigten mit zunehmendem Sauerstoffgehalt der Schweiße bzw. der Legierung eine Potentialveredlung, wenn der Sauerstoffgehalt 0,6% nicht übersteigt. Die Korrosionsgeschwindigkeit der Titan-Sauerstoff-Legierungen ändert sich hierdurch nicht. Höhere Sauerstoffgehalte dagegen bewirken i siedender 2,5%iger Schwefelsäure eine verstärkte Korrosion. Dies ist allerdings in Anbetracht des an sich schon hohen Angriffs für die Praxis ohne belang. Ähnlich liegen die Verhältnisse bei Titan-Stickstoff-Legierungen. Die auftretende verstärkte Korrosion bei geschweißten Proben konnte auf einen Einfluß der Wärmebehandlung zurückgeführt werden, die auch bei ungeschweißten Proben einen unzulässig starken Angriff hervorrufen. Oxydierende Lösungen greifen auch Titan-Schweißnähte nicht an. Durch einen Zusatz von 0,2% und mehr Pd kann die Korrosionsbeständigkeit in nicht oxydierenden Medien verbessert werden. An Hand von Potentialmessungen und Stromspannungskurven wird das Korrosionsverhalten der TiPd-Legierungen erklärt.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 619-627 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion protection by means of paintsThe degree of protection afforded to metal surfaces such as iron or aluminium by coats of paints, i. e., organic protective coatings, is largely governed by three factors: the metal surface acting as a boundary layer; the boundary layers between the different coats of paint; and the top surface of the paint system, i. e. the boundary layer between point and air. These boundary layers are here subjected to closer scrutiny, and special attention is drawn to the importance of the boundary layers as regards the preparation and pre-treatment of the base, the application of the different protective coatings, and the service life required from them. The problems of the thickness of the coatings and their freedom from porosity are discussed, and brief reference is made to the importance of pigment volume concentration. The informative value of the sections dealing with boundary layers is enhanced by references to the influence of the structural design, to the correct preparation and pretreatment of bases, to the economic aspects, to the most suitable ways and means of applying the coatings and, finally, to the influence of the surroundings. The sections dealing with the structure and system of coats of paints and the discussion of the solution of difficult problems of corrosion protection by means of organic coatings convey an idea of the practical application of the coating nowadays available for corrosion protection. In conclusion, the author discusses the notions „metal-bare“ and „metal-pure“.
    Notes: Die Sicherung von Metalloberflächen wie z. B. Eisen oder Aluminum durch Anstrichschichten, d. h. organische Schutzschichten, wird im wesentlichen von 3 Komponenten: der Metalloberfläche als Grenzschicht, den Grenzschichten zwischen den einzelnen Anstrichschichten und der Anstrichoberfläche, d. h. der Grenzfläche Anstrich/Luft mitbestimmt. Diese Grenzschichten werden einer näheren Betrachtung unterworfen und auf die Bedeutung der Grenzschichten in bezug auf Vorbereitung und Vorbehandlung des Untergrundes, auf die Aufbringung der einzelnen Schichten und die Lebensanforderungen, die an die Schutzschichten gestellt werden, wird hingewiesen. Die Probleme der Schichtdicke und Porenfreiheit von Schutzschichten werden besprochen und die Bedeutung der Pigmentvolumenkonzentration kurz erläutert; Hinweise auf den Einfluß der Konstruktion eines Bauwerkes, auf das richtige Vorbereiten und Vorbehandeln von Untergründen, auf die größte Wirtschaftlichkeit, auf zweckmäßige Aufbringung und Aufbringungsmethoden und endlich auf die Einwirkung der Umwelt sollen den Aussagewert der Abschnitte über die Grenzflächen noch vertiefen. Die Abschnitte über Anstrichaufbau und -systeme sowie die Erläuterungen zur Lösung schwieriger Korrosionsschutzprobleme durch organische Schutzschichten geben einen Ausblick auf die praktische Anwendung der heute verfügbaren Anstrichmittel im Korrosionsschutz. Als Abschluß wird zu den Begriffen metallisch blank oder metallisch rein Stellung genommen.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 645-651 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 713-720 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 721-727 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. XXXIII 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961) 
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    Description / Table of Contents: Corrosion resistance of nickel and nickel alloys, and the influence of further alloying matterNickel has excellent mechanical and corrosion-chemical properties and is therefore well suited for technical application, both non-alloyed or slightly alloyed, and in alloys consisting of two or more metals. Subsidiary constituents of nickel, such as carbon or minor admixtures (Mn, Mg or Al) have comparatively little influence on its corrosion properties. In contrast, alloying admixtures such as copper, chrome, iron or molybdenum have a decisive influence on the durability of nickel so that, depending on the alloying element, alloys with special corrosion-chemical properties are obtained which can be selected for different corrosives such as caustic alkali, diluted acids, strong acids (HCl, H2SO4 HNO3 HF) or chlorine gas, and for high oxidation risks.The influence of the different alloying metals, as a function of the alloying percentage, is discussed in greater detail for two-metal systems. With each individual system, there are certain ranges where their properties are optimal. Moreover, alloying admixtures may also serve to develop passive properties (e.g. in systems containing chrome) or to promote the tendency to form protective layers, or to stabilize protective layers already forming. Such influence is, for instance, exerted by iron, manganese or aluminium in the copper-nickel system. The relationships are shown in the form of diagrams, as far as these are known.
    Notes: Nickel hat hervorragende mechanische und korrosionschemische Eigenschaften, die es sowohl unlegiert bzw. Schwach legiert als auch in seinen Zwei- und Mehrstofflegierungen für technologische Zwecke geeignet machen. Die Nebenbestandteile im Nickel, wie Kohlenstoff, und geringe Zusätze (Mn, Mg und Al), verändern die Korrosionseigenschaften des Nickels verhältnismäßig wenig. Legierungszusätze wie Kupfer, Chrom, Eisen und Molybdän verändern dagegen die Beständigkeit des Nickels entscheidend, so daß je nach Element Legierungen mit besonderen korrosionschemischen Eigenschaften entstehen, die für die verschiedenartigen Beanspruchungen durch Ätzalkali, verdünnte Säuren, starke Säuren (HCL, H2SO4, HNO3, HF), Chlorgas und oxydierende Bedingungen gewählt werden können.Der Einfluß der verschiedenen Legierungsmetalle wird an den Zweistoffsystemen mit Kupfer, Chrom, Eisen, Molybdän bzw. an Dreistoffsystemen in Abhängigkeit vom Legierungsanteil näher gezeigt. In den einzelnen Systemen bestehen Bereiche mit optimalen Eigenschaften. Weiter können Zusätze dazu dienen, passive Eigenschaften zu entwickeln (z. B. in Systemen mit Chrom) oder auch die Neigung zur Schutzschichtbildung zu fördern bzw. sich bildende Schutzschichten stabiler zu machen. Von Einfluß in diesem Sinne sind z. B. Eisen, mangan oder Aluminium im System Kupfer/Nickel. die Zusammenhänge werden in Diagrammen, soweit diese bekannt sind, dargestellt.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 747-747 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Progress and experience in the use of corrosion-resistant steels.  -  The question fo stabilizing ferritic 17% chrome steels against intercrystalline corrosionThis postscript to the article “progress and experience in the use of corrosion-resistant steels” is confined to some supplementary data concerning (corrosion-resistant) ferritic 17% chrome steels in regard to the proneness of the non-annealed welds to intercrystalline corrosion. Such proneness can be countered through stabilisation with special carbide agents, viz. titanium as well as niobium admixtures. In selecting the magnitude of these admixtures  -  greater with niobium than with titanium  -  it is in any case necessary to take the carbon and nitrogen contents into accounts.Niobium admixtures have certain advantages in the production of rolling band which is widely used, e. g. for household machines.Reference is made to the possibilities of testing the resistance to intercrystalline corrosion (indifference to grain desintegration).
    Notes: Dieser Nachtrag zu dem Aufsatz „Fortschritte und Erfahrungen in der Anwendung korrosionsbeständiger Stähle“ beschränkt sich auf ergänzende Angaben über (korrosionsbeständige) ferritische 17%ige Chromstähle und zwar in Bezug auf die Anfälligkeit von nicht nachgeglühten Schweißnähten gegen interkristalline Korrosion. Die Bekämpfung dieser Anfälligkeit gelingt durch Stabilisierung mit Sondercarbidbildnern und zwar sowohl mit Titan- als auch mit Niob- Zusätzen. Die Höhe der Gehalte, die bei Niob größer ist als bei Titan, muß in jedem Fall den Kohlenstoff- und den Stickstoffgehalt berücksichtigen.Niobzusätze bringen für die Herstellung von Walzband, das z. B. für Haushaltmaschinen weitgehend verwendet wird, Vorteile.Auf die Prüfmöglichkeiten zum Nachweis der Beständigkeit gegen interkristalline Korrosion (oder: die Kornzerfallsunempfindlichkeit) wird hingewiesen.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 764-766 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 752-758 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: The importance of layer thickness in corrosion protection coatingsThe protective value of coatings is decisively governed by the layer thickness. This applies to active as well as passive anti-corrosive coatings.The layer thickness has a bearing on the factors important to corrosion protection, such as adhesion, hardness and elasticity, porosity, durability, and corrosion protection effect.Contrary to earlier assumptions, the layer thickness required for optimum protection cannot be determined from the depth of roughness of the coating base alone. What is decisive is the ratio of depth and width of roughness.The layer thickness that can be achieved with a given coating compound depends on the type of this compound, on the application technique used, and on the processing.Of particular importance is the measuring of the layer thickness, and a description is given of the methods most commonly used.On the basis of the investigations carried out by R. pierce, it is shown that corrosion protection can only become possible with a dry layer thickness exceeding 125 micron.
    Notes: Von ausschlaggebender Bedeutung für den Schutzwert eines Anstriches ist die Schichtdicke. Dies gilt für die aktiven und passiven Korrosionsschutzanstrichsysteme.Die Schichtdicke beeinflußt die für den Korrosionsschutz wichtigen Faktoren wie Haftung, Härte und Elastizität, Porigkeit, Beständigkeit und Korrosionsschutzwirkung.Die für einen optimalen Schutz erforderliche Schichtdicke läßt sich nicht, wie bisher angenommen, allein aus der Rauhtiefe des Anstrichuntergrundes ableiten. Vielmehr ist das Verhältnis Rauhtiefe zu Rauhbreite entscheidend.Die mit einem Anstrichmittel erreichbare Schichtdicke ist bedingt durch den Typ des Anstrichmittels, der Art der Anstrichtechnik, der Verarbeitung.Von besonderer Bedeutung ist die Messung der Schichtdicke. Die gebräuchlichsten Verfahren werden aufgeführt.An Hand der Untersuchungen von R. Pierce wird gezeigt, daß korrosionsschutz erst oberhalb einer Trockenschichtdicke von 125 μ möglich ist.
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    Description / Table of Contents: Cleaning and Sanitation of tanksIn recent years, cleaning and sanitation of milk tanks by spraying methods have assumed greater importance. In this connection, the question arises whether the spraying methods might expose the tank construction materials to corrosion risks. With the spraying chambers conventionally used for corrosion tests, the solutions are deliberately sprayed into the air, and not directly on the specimens of material. For an assessment of the corrosivity of sprayed solutions, it was therefore necessary to develop an apparatus which permits the direct spraying of the solution on to the test plates. Design and operation of this plant are described in detail.
    Notes: Die Reinigung und Desinfektion von Milchtanks mittels Sprühverfahrens haben in den vergangenen Jahren Bedeutung gewonnen. Im Zusammenhang damit taucht die Frage auf, ob die Sprühverfahren mit Korrosionsgefahren für die im Tankbau eingesetzten Werkstoffe verbunden sein können. Bei den bisher für Korrosionsversuche eingesetzten Sprühkammern werden die Lösungen absichtlich nur in den Luftraum, aber nicht auf die Materialproben direkt versprüht. Daher mußte für die Kontrolle des korrosiven Verhaltens versprühter Lösungen eine Apparatur entwickelt werden, welche es gestattet, die Lösung unmittelbar auf die Prüfbleche zu sprühen. Aufbau und Arbeitsweise der Anlage sind eingehend beschrieben.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 767-772 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 748-752 
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    Description / Table of Contents: Some observations on the influence on corrosion of salts of heavy metals contained in pickling acidsBy means of ferrous sulphate, it is, in practice, possible to prevent the corrosion of high-alloyed steels by 20 per cent. sulphuric acid after a certain concentration has been exceeded. In contrast, corrosion shows a slight increase with the concentration in Ni—Mo alloys (Euzonites). The presence of ferrous sulphate enhances the protective effect with the steels, and has a similar effect on the corrosion of the Ni alloy Euzonite 60 which contains chrome. In the Ni alloy Euzonite 70, however, which is free from chrome, the presence of the oxidizing salt tends to promote corrosion.An addition of 3 per cent. hydrochloric acid to the sulphuric acid, which had been provided in order to reinforce the pickling effect, increases corrosion to such an extent that, over the entire field of chemotechnical applications, Euzonite 60 shows the highest corrosion resistance.A systematic investigation into the effect of the salts of heavy metals over a wide range of concentrations in 20 per cent. sulphuric acid showed that even a very small concentration of copper sulphate has a highly inhibitive effect on steel corrosion. The effect becomes weaker with higher Ni content, and may eventually lead to a maximum degree of corrosion at about 1 per cent. But the corrosion of Ni alloys, and especially Euzonite 70, increases with the copper content of the acid.If ferrous sulphate is added, the steels again show a sudden decrease in corrosion, but only at concentrations which are much higher than those of copper. In contrast, the corrosion of Euzonites again increases fairly steadily as the concentration of ferrous sulphate increases.As far as ferric sulphate is concerned, even a small quantity will, in steels, lead to a virtually complete suppression of corrosion, even at boiling temperature whilst, in the Ni alloy Euzonite 70, the degree of corrosion is considerably increased. With Euzonite 60, the results show a scatter, presumably because the passivating effect of the chrome is not quite sufficient.On the strength of results obtained from further tests with mixtures of ferrous and ferric sulphate, it would appear possible to use the austenitic Cr—Ni—Mo steel S N 9 as a material for pumps, if about 1 per cent. ferric sulphate is initially added to the acid in order to withstand the strong initial attack by the acid. At a later stage, the protective function is taken over by the ferrous sulphate formed during the pickling process. The same effect can also be obtained by the initial addition of 0.1 per cent. copper sulphate, if there is no reason to fear copper carburisation caused by the material to be pickled.
    Notes: Durch Ferrosulfat kann die Korrosion auf hochlegierte Stähle durch 20%ige Schwefelsäure nach Überschreiten einer gewissen Konzentration praktisch verhindert werden, während si bei den Ni—Mo-Legierungen (Euzonite) mit der Konzentration langsam steigt. Die Gegenwart von Ferrisulfat verstärkt bei den Stählen noch die schützende Wirkung und hat eine ähnliche Wirkung auf die Korrosion der chromhaltigen Ni-Legierung Euzonit 60 während die Korrosion der chromfreien Ni-Legierung Euzonit 70 durch die Gegenwart des oxydierend wirkenden Salzes verstärkt wird.Die Gegenwart von 3% Salzsäure in der Schwefelsäure, die zur Verstärkung der Beizwirkung vorgesehen war, verstärkt den Angriff derart, daß über die gesamte chemisch-technische Beanspruchung gesehen, Euzonit 60 die beste Korrosions-beständigkeit zeigt.Die systematische Untersuchung der Wirkung von Schwermetallsalzen über ein weites Konzentrationsgebiet in 20%iger Schwefelsäure ergab, daß Kupfersulfat schon in sehr geringen Mengen eine stark hemmende Wirkung auf die Korrosion der Stähle hat, die mit steigendem Ni-Gehalt geringer wird un schließlich zu einem Maximum der Korrosion bei etwa 1% führen kann. Die Ni-Legierungen, besonders Euzonit 70, werden jedoch umso stärker angegriffen, je höher der Cu-Gehalt der Säure ist.Bei der Zugabe von Ferrosulfat ergibt sich bei den Stählen ebenfalls ein plötzlicher Abfall der Korrosion, jedoch sind hier erheblich höhere Konzentrationen notwendig als bei Kupfer. Bei den Euzoniten hingegen ergibt sich auch hier ein ziemlich stetiges Anwachsen der Korrosion mit steigender Konzentration an Ferrosulfat.Die Gegenwart von Ferrisulfat führt schon in sehr geringen Mengen bei den Stählen zu praktisch völliger Unterdrückung der Korrosion, auch bei Siedetemperatur, während bei der Ni-Legierung Euzonit 70 die Korrosion erheblich erhöht wird. Bei Euzonit 60 ergeben sich streuende Werte, offenbar, weil die passivierende Wirkung des Chroms nicht ganz ausreicht.Aufgrund der Resultate weiterer Versuche mit Mischungen von Ferro- und Ferrisulfat erscheint es möglich, als Pumpenmaterial den austenitischen Cr-Ni-Mo-Stahl Märker S N 9 zu verwenden, wenn der Beizsäure anfänglich etwa 1% Ferrisulfat zugesetzt wird, um den zunächst zu erwartenden starken Angriff durch die Säure zu überbrücken. Der spätere Schutz wird durch das sich durch das Beizverfahren anreichernde Ferrosulfat übernommen. Die gleiche Wirkung läßt sich auch durch die anfängliche Zugabe von 0,1% Kupfersulfat erreichen, wenn kein Auszementieren des Kupfers durch das zu beizende Material zu befürchten ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 773-785 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 786-794 
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 796-796 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 796-796 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Keywords: Chemistry ; Polymer and Materials Science
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 797-797 
    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 12 (1961), S. 797-797 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 797-797 
    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 12 (1961), S. 799-799 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 799-800 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 10-15 
    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
    Notes: Neben praktischen Erfahrungen über die Größe der Proben für Korrossionsuntersuchungen nach der Gewichtsverlust-Methode, über die Zahl der Proben je Zeitstufe und die Zahl der Zeitstufen mit einem Ausblick auf die Untersuchung von Anstrichen und Spachtelmassen werden Überlegungen über die Verteilung der Zeitstufen mitgeteilt, wobei erreicht werden soll, daß weniger Proben zugleich im Einsatz sind. Drei verschiedene Zeitstufenpläne werden in Zahlentafeln dargestellt. Für das Aufsuchen der günstigsten Bedingungen für den Einsatz eines Werkstoffes werden schematische Anleitungen gegeben und eine übersichtliche Darstellung des gesamten Untersuchungsplanes mit Hilfe von Sterndiagrammen wird empfohlen. Für das Auswerten von Korrosionsversuchen und für das Umrechnen nicht genormter Größen auf genormte Werte wird auf die Verwendung von Leitertafeln hingewiesen.
    Additional Material: 4 Ill.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 32-45 
    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: 1 Tab.
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    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 67-67 
    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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