Abstract
The effects of dipping time in chromium plating bath before the electroplating and of anodic oxidation by bipolarization during the plating were investigated. The following results were obtained: (1) When the dipping time was long or the sample was subjected to anodic oxidation in the chromium plating bath, an oxide film was formed on the nickel plating surface; then, the deposition range of chromium plating became narrower, which made it difficult to get an excellent bright chromium plating. (2) The effects of anodic oxidation were greater when the temperature of plating bath was higher and they were nearly proportional to the oxidation time; then, the deposition range of chromium plating became narrower, which finally led to very little deposits. (3) The effects of anodic oxidation were greater in Sargent bath than in hydrofluosilicic acid bath.
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