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  • 1
    Electronic Resource
    Electronic Resource
    Eine rotierende Scheibenelektrode mit optisch durchlässigem Ring zur spektrophotometrischen Untersuchung von Produkten elektrochemischer Reaktionen (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 792-792 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384382
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of electrolytic hydrogen on the etch pit density of iron (110) surfaces (1984)
    Springer
    Applied physics 35 (1984), S. 219-226 
    Details
    ISSN: 1432-0630
    Keywords: 61.70Jc ; 66.30Jt+Lw ; 68.20+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Etch pit densities on iron (110) surfaces in sulphuric acid grow linearly with the interfacial hydrogen activity in excess of a critical activity. The hydrogen activity is approximately proportional to the square root of the cathodic current density. At constant cathodic current density the etch pit density increases with temperature and decreases with external stress. Dislocations at which the excess etch pits form penetrate into the iron at a rate proportional to the hydrogen activity and the square root of time. Effects of prior hydrogen deposition on the shape of etch pits are seen at depths greater than the penetration depth of hydrogen generated dislocations. Changes of etch pit shape similar to those produced by hydrogen are also found when external stress is applied. The results are compared to Prussin's theory in which the assumption is made that stresses accompanying diffusion of an impurity are fully relieved by plastic deformation and formation of dislocations for stresses exceeding a critical stress. While some of the predictions of the theory are met by the experiments, the dislocations penetrate into the iron much slower than diffusion of hydrogen, since dislocations cannot move fast enough, i.e. stresses are not fully relieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617171
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  • 3
    Electronic Resource
    Electronic Resource
    Steps and kinks on {211} iron surfaces and the kinetics of the iron electrode (1979)
    Springer
    Journal of applied electrochemistry 9 (1979), S. 155-160 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The quantitative analysis of the morphology of dislocation-free {211} iron surfaces during electrochemical dissolution and measurements of distances and directions of monatomic steps provide information about the rates and potential dependences of three different elementary processes involving iron atoms bound to the lattice in three geometrically and energetically different states. The interaction of the three elementary processes explains the well-known anomalies of the kinetics of the iron electrode. A statistical analysis of the step distances is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616085
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  • 4
    Electronic Resource
    Electronic Resource
    Lectures on Electrochemical Corrosion. Von M. Pourbaix, 336 S., 121 Abb. Plenum Publishing Corp., New York, London 1973; Preis $ 32- (1974)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 25 (1974), S. 234-234 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19740250331
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  • 5
    Electronic Resource
    Electronic Resource
    Wachstum und Auflösung anodisch erzeugter Oxidschichten auf Titan (1975)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 694-699 
    Details
    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: Growth and dissolution of anodically obtained oxide layers on titaniumOxide films were grown by anodic polarization of titanium in various aqueous electrolytes. The field strength derived from film thickness and voltage is linearly related to the logarithm of the total current density. The current efficiency for film formation depends upon current density, pH-value, and film thickness. The dielectric constant of the film decreases with field strength from ε = 110 to ε = 7, but rises again at high field strengths and thick films.The dissolution rate of anodic oxide films on titanium was investigated as a function of pH-value, concentration of chloride, and temperature, respectively. Aging of the films in distilled water causes the dissolution rate to decrease by up to 3 order of magnitude.
    Notes: Während des Wachstums von Oxidschichten auf Titan in verschiedenen wäßrigen Elektrolytlösungen ist die aus Schichtdicke und Formierungsspannung ermittelte Feldstärke eine lineare Funktion des Logarithmus des Gesamtstromdichte. Die Stromausbeute für das Schichtwachstum hängt von der Stromdichte, dem pH-Wert und der Schichtdicke ab. Die Dielektrizitätskonstante der Schicht sinkt mit der Feldstärke zunächst von ε = 110 auf ε = 7 ab und wächst bei hohen Feldstärken und dicken Schichten wieder erheblich an.Die Auflösungsgeschwindigkeit anodisch erzeugter Oxidschichten auf Titan wurde in Abhängigkeit vom pH-Wert, der Chlorid-konzentration und der Temperatur untersucht. Während der Alterung der Schichten in destilliertem Wasser nimmt die Auflösungsgeschwindigkeit um bis zu 3 Zehnerpotenzen ab.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19750260904
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  • 6
    Electronic Resource
    Electronic Resource
    Die Kinetik der Auflösung von Aluminium in alkalischen Lösungen (1971)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 22 (1971), S. 297-302 
    Details
    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 kinetics of the dissolution of aluminium in alcaline solutionsThe stationary dissolution rates of rotating aluminium discs were measured in alcaline sodium sulfate solutions as function of the Ph- value and of the rotational speed using the Förster eddy current test and electrochemical methods. The rates are controlled by diffusion or by heterogeneous dissolution of aluminate from the passive, oxide-covered aluminium. If the rate is diffusion-controlled, a secondary layer very probably consisting of hydrargillite is formed on the passive aluminium. The rate of the heterogeneous dissolution grows little with the Ph-value and depends strongly upon the electrode potential at unnoble potentials and weakly at noble potentials. Cathodic evolution of hydrogen increases the diffusion-limited as well as the reaction limited dissolution rates because of the excess of hydroxyl ions formed at the surface.
    Notes: Die stationäre Auflösungsgeschwindigkeit rotierender Alumimiunscheiben wurde in alkalischen Natriumsulfatlösungen in Abhängigkeit vom PH-Wert und der Drehzahl mit dem elektromagnetischen Wirbelstromverfahren nach Förster und mit elektrochemischen Methoden gemessen. Die Geschwindigkeit wird teils durch Diffusion, teils durch die heterogene Auflösung von Aluminat aus dem passiven, oxidbedeckten Aluminium bestimmt. In Falle der diffusionsbestimmten Auflösung bildet sich auf dem passiven Aluminium eine sekundäre Schicht aus, die sehr wahrscheinlich aus Hydrargillit besteht. Die Geschwindigkeit der heterogenen Auflösung ist bei unedlen Potentialen stark und bei edlen Potentialen schwach potentialabhängig und sie steigt wenig mit dem PH-Wert an. Kathodische Wasserstoffabscheidung erhöht die Auflösungsgeschwindigkeit wegen gehemmter Abdiffusion von Hydroxylionen, sowohl wenn die Auflösung diffusionsbestimmt ist als auch wenn sie reaktionsbestimmt ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19710220405
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  • 7
    Electronic Resource
    Electronic Resource
    Grundlagen der Technischen Elektrochemie. E. Heitz und G. Kreysa. - Erweiterte Fassung eines Dechema-Experimentalkursus, 290 S., 69 Abb., 20 Tab., Verlag Chemie, Weinheim, New York 1977, Preis DM 48,- (1979)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 231-232 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19790300325
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  • 8
    Electronic Resource
    Electronic Resource
    Das Korrosionsverhalten von Eisen and Stahl in flüssigem Ammoniak (1981)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 32 (1981), S. 167-173 
    Details
    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 behaviour of iron and steel in liquid ammoniaPolarization curves were measured with iron in liquid ammonia containing various electrolytes of different acidities at - 40°C and + 20°C. The dissolution rate of iron by formation of iron(II) is independent of the electrolyte composition and follows a Tafel-line of the slope RT/2.0.4 F. At positive potentials iron becomes passive. The steady state current densities are nearly independent of the electrode potential and grow with acid concentration and temperature. At very positive electrode potentials the current densities again increase exponentially with the potential. The current efficiencies for nitrogen evolution and iron(III) dissolution are of equal magnitude. Iron oxidized in air exhibits an electrochemical behavior distinctly different from the one of iron passivated in liquid ammonia. Very probably the passivating layer is composed of iron nitride with a thickness of the order of nm. Passive steel FG 32 in the soft state after heat treatment corrodes at about the same rate as pure iron, but approximately 8 times faster in the cold worked state.
    Notes: An Eisen in flüssigem Ammoniak wurden bei -40°C und bei + 20°C Stromspannungskurven in stark und schwach sauren Elektrolytlösungen gemessen. Die Auflösungsgeschwindigkeit des aktiven Eisens zu Eisen(II) ist unabhägig von der Elektrolytzusammensetzung und folgt einer Tafel-Geraden mit der Neigung RT/2 · 0.4 F. Bei positiven Elcktrodenpotentialen wird das Eisen passiv. Die stationären Stromdichten sind nahezu potentialunabhängig und nehmen mit der Säurekonzentration und der Temperatur zu. Bei sehr positiven Elektrodenpotentialen wachsen die Stromdichten wieder exponentiell mit dem Potential. Die Stromausbeuten für, die Entwicklung von Stickstoff und die Eisen (III)-auflösung sind ähnlich groß. Luftpassives Eisen unterscheidet sich im elektrochemischen Verhalten deutlich von in Ammoniak passiviertem. Es entsteht sehr wahrscheinlich eine Eisennitridschicht mit einer Dicke der Größenordnung nm. Passiver Stahl FG 32 korrodiert im weichgeglühten Zustand etwa ebenso schnell wie reines Eisen, aber im kaltgezogenen Zustand rund 8mal schneller.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19810320403
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  • 9
    Electronic Resource
    Electronic Resource
    Der Einfluß von Wasser and gelösten Gasen auf das Korrosionsverhalten des Eisens in flüssigem Ammoniak (1981)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 32 (1981), S. 197-200 
    Details
    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 water and dissolved gases on the corrosion behaviour of iron in liquid ammoniaOxygen increases the corrosion rate of active iron in liquid ammonia at + 20°C and passivates iron at concentrations exceeding a critical concentration which increases with the acidity. Water acts as an acid and increases the corrosion rate of passive iron up to 0.1 wt. %. At higher concentrations of water, corrosion is inhibited probably because of the precipitation of hydrated iron (III) oxide. Carbon dioxide always enhances the corrosion rate of passive iron acting as a strong acid and a strong complexing agent for iron (III). At high concentrations of carbon dioxide or ammonium carbaminate iron cannot be passivated.
    Notes: Sauerstoff erhöht die Korrosionsgeschwindigkeit des aktiven Eisens in flüssigem Ammoniak bei + 20 °C und passiviert das Eisen, sobald eine mit der Säurekonzentration abnehmende kritische Konzentration überschritten wird. Wasser wirkt als Säure und erhöht bis zu 0,1 Gew. % die Korrosionsgeschwindigkeit des passiven Eisens. Bei höheren Wassergehalten ist Wasser wahrscheinlich wegen der Ausfällung von hydratisiertem Eisen (III)-oxid ein Inhibitor. Kohlendioxid vergrößert stets die Korrosionsgeschwindigkeit des passiven Eisens. Es ist eine starke Säure und ein starker Komplexbildner für Eisen (III). Bei hohen Konzentrationen von Kohlendioxid oder Ammoniumcarbaminat kann das Eisen nicht mehr passiviert werden.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19810320502
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  • 10
    Electronic Resource
    Electronic Resource
    Zuschriften (1985)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 22-22 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19850360105
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