Cathodic Polarization Characteristics of Pure Chromic Acid Solution:Studies on Chromium Plating (Part 1)
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The cathodic polarization characteristics of pure chromic acid solution were measured by potentiostatic method for the investigation of its chathodic reaction.The following results were obtained:1) Electro-deposition of metallic chromium appeared in the chromic acid solution to which anions had been added in the potential range of the 4th branch on the polarization curve; whereas, in pure chromic acid solution, deposition of hydrated chromium oxide film appeared at first, and subsequently black chromium plating occurred.2) Significant hysteresis was observed in pure chromic acid solution when in was polarized to the potential range of the 4th branch.
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