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  • 1
    Electronic Resource
    Electronic Resource
    Corrosion in alkali hydroxide solutions of electrolytic zinc powder containing codeposited lead (1976)
    Springer
    Journal of applied electrochemistry 6 (1976), S. 163-169 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The corrosion rate of electrolytic Zn sponge in alkaline solutions is controlled by codeposited Pb in concentrations from 0.2–0.5%. It appears that codeposited lead in this respect is as good as mercury but has the advantages of being cheaper and less toxic. The Zn sponge containing codeposited Pb offers the additional advantage of having a highly developed surface area so that the porous electrodes pressed with such a sponge can be discharged at higher rates. The effect of KOH concentration on the corrosion rate of Zn sponge with and without Pb is explained in terms of the different mechanisms of the hydrogen evolution reaction on the Fe inclusions on the one hand, and on pure Zn on the other. An empirical equation for the approximate estimation of the corrosion rate of Zn sponge in 10 N KOH at 50° C as a function of Pb and Fe content in the sponge is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615383
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics of growth of zinc dendrite precursors in zincate solutions (1978)
    Springer
    Journal of applied electrochemistry 8 (1978), S. 213-222 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract By means of microscopic measurements on a rotating disc electrode under potentiostatic conditions it is established that the propagation rate of the precursors is constant within the limits of the diffusion layer boundary. The propagation kinetics follow the expression of Diggle, Despić and Bockris [3] if it is assumed that the radii of curvature at the tip of the growing precursorsr increase proportionally with the height of the precursorsy. The overpotential dependence of the ratioy/r is linear and probably reflects the Kelvin relation. At constant diffusion layer thickness the moment of the visual appearance of the dendrites coincides with the transition time on the potentiostaticI-t curves. The average heighty at this moment is equal to the diffusion layer thickness δ. The average rate of growth of precursors is inversely proportional to δ. An equation for the time of appearance of dendrites which accounts for the effect of diffusion is derived and experimentally tested. The effect of lead ions on the time of appearance is discussed in terms of the kinetic equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616424
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  • 3
    Electronic Resource
    Electronic Resource
    Zinkphosphat-Überzüge aus übersättigten BädernÜbersetzt: D. Heidrich u. H. Puschmann (1967)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 18 (1967), S. 978-983 
    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: Zinc phosphate coatings from supersaturated bathsThe author studied the properties of supersaturated phosphating solutions containing zinc phosphate being used for phosphating steel. The study included the influence of the solution variables, and in particular of the ferrous ion concentration, on the supersaturation and the coating properties. The accelerating effect of supersaturation is so strong that heavy, dense, and fine grain coatings are obtained without oxidants and at temperatures as low as + 10° C. Some aspects of the kinetics and the mechanism of coating formation in supersaturated solutions are discussed. Supersaturated phosphating solutions with zinc phosphate may find practical application, particularly where a high degree of protection is desired.
    Notes: Verf. untersuchte die Eigenschaften von übersättigten Phosphatierungslösungen mit Zinkphosphat beim Phosphatieren von Stabl. Dabei wurde der Einfluß der Lösungsparameter, besonders der Konzentration von Fe2+, auf den Übersättigungsgrad und die Eigenschaften des Überzugs untersucht. Der beschleunigte Einfluß der Übersättigung ist so stark, daß auch ohne Oxydationsmittel und bei Temperaturen bis zu 10°C schwere, dichte und feinkörnige Schichten erhalten werden. Einige Aspekte der Schichtbildungskinetik und des Schichtbildungsmechanismus in übersättigten Lösungen werden erörtert. Übersättigte Phosphatierungslöusungen mit Zinkphosphat können in der Praxis verwendet werden, besonders wenn ein hober Schutzgrad gewünscht wird.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19670181105
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