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A general model of the anodic behaviour of nickel in acidic media

✍ Scribed by A. Jouanneau; M. Keddam; M.C. Petit

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
479 KB
Volume
21
Category
Article
ISSN
0013-4686

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✦ Synopsis

An

experimental study of the anodic behaviour of nickel in acidic media is carried out by steady state polarization curves and fara&ic impedance measurements as a function of various parameters related to the electrolyte: pH, concentration and the nature of the anions. We propose several models of the electrode reaction path based on heterogenous chemical kinetic concepts. By a convenient numerical fitting method, we calculate a set of kinetic parameters which are afterwards put into the theoretical equations for dc and the impedance. By this procedure we are able to choose a general model accounting for the behavidur of nickel in a wide range of experimental conditions: active dissolution, passivity, secondary passivity and the oxidation of OH-to molecular oxygen.

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