Cathodic Polarization Characteristics of Chromium Plating Bath:Studies on Chromium Plating (Part 2)
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The cathodic polarization characteristics of chromium plating baths, to which various anions had been added, were measured by potentiostatic method for the investigation of their cathodic reactions.The following results were obtained:1) The cathodic reaction of black chromium plating bath in the potential range of the 4 th branch consisted of electrodeposition of hydrated chromium oxide film and black chromium plating as seen in pure chromic acid solution.2) Metallic chromium was directly deposited from the stage of chromate film without parsing through the stages of hydrated chromium oxide film and black chromium plating.3) The deposition process and properties of the deposits were varied according to kind and amount of anions added to the chromium plating bath; and also they depended upon the conditions of electrolysis.
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