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Anodes for a trivalent chromium electroplating bath

Olga I. Kasian, Yulia A. Velichenko, Tatiana V. Luk’yanenko, Alexander B. Velichenko

Abstract


Electrochemical behavior of different anode materials in electrolytes containing trivalent chromium salts was investigated. Some of electrodes (Ti/MnO2, platinized titanium, materials based on Ebonex®) were shown to be n-type semiconductors. Semiconducting properties of electrodes affects their electrochemical behavior.It was shown that choice of an appropriate anode for a trivalent chromium electroplating bath should be based on compromise between its selectivity and service life. It was found that current efficiency of Сr(VI)-species strongly depends on the nature of anode material. Dimensionally stable anode based on mixture of titanium oxides and ruthenium oxides, PbO2, Ti/MnO2 anodes are characterized by low rates of Cr(VI)-species generation. Nevertheless these materials are not stable in the electrolyte media that limits their application for hard chromium electrodeposition. Composite materials based on platinized titanium or platinized Ebonex® are recommend as anodes for carbamide-containing electrolytes since they characterized by good service life and admissible values of current efficiency of Сr(VI)-species.

Keywords


Cr electroplating; semiconductor; anode materials; electrocatalytic activity

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References


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DOI: http://dx.doi.org/10.15421/081407

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