Abstract

The manufacture of metallic powders by electrodeposition is a well-documented process [1-4] which is often accompanied by hydrogen evolution, reducing the efficiency. Previous work [5] has indicated that, in some cases at least, the evolution of hydrogen occurs not at the powderelectrolyte interface but at the solid electrode surface on which the powder layer is being deposited. This suggests that it may be possible to increase the efficiency by the use of a cathode material having a greater hydrogen overvoltage than traditional materials such as the austenitic stainless steels, the hydrogen evolution characteristics of which have been reported [6-8]. Nickeltin alloy was chosen as a promising alternative material [9-12] which might be of more practical interest than the liquid mercury electrode which appears to be the only one of this type already tried [13].

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