Authors: A V Syugaev N V Lyalina S F Lomayeva A N Maratkanova
Publish Date: 2015/12/30
Volume: 20, Issue: 3, Pages: 775-784
Abstract
The electrochemical properties of Ni3C was studied In acidic sulfate solutions the carbide is characterized by high overpotential of its oxidation as compared with nickel In the case of carbide oxidation the anodic reaction orders with respect to anions are low indicating a weak dependence of the rate of the anodic process on the solution composition Significant differences in the kinetics of the anodic processes indicate different mechanisms of the oxidation of nickel and its carbide The rate and kinetic parameters of the hydrogen evolution reaction are comparable on Ni and Ni3C In neutral and alkaline solutions the metal and carbide samples were similar in their electrochemical characteristics The anodically grown oxide film is thinner on nickel carbide than on nickel metal and the oxide formed on the carbide is more readily reduced under cathodic polarization This film is also more resistant to the pitting attack than the oxide film on nickel metalThe work was supported by the Russian Foundation for Basic Research no 130396099 ural a The authors thank SV Zayats Institute of Electrophysics UB RAS for his assistance in compacting the samples and GV Sapozhnikov PTI UB RAS for the xray fluorescence analysis of the samples
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