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The codeposition behavior of three alloy systems, FeNi, FeCo, and CoNi, was studied in acid sulfate electrolytes using rotating cylinder electrodes to control mass transport conditions. The partial current densities of the codepositing metals and of the side reaction were determined from an analysis of the deposit and were compared with those measured for the pure metals deposited under identical conditions. Results confirmed that Ni is inhibited by the presence of Fe 2 + and Co 2 + ions. Fe deposition rate is enhanced by the presence of Co 2 + and Ni 2 + ions. The ion of the less noble metal has a stronger influence on the deposition behavior of the partner ion. Co is inhibited by codeposition of Ni 2 + ions and enhanced by Fe 2 + ions. The present data demonstrate that anomalous codeposition of iron group metals involves both inhibiting and accelerating effects.
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Zech et al. (1999) studied this question.
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