The role of chromium II and VI in the electrodeposition of chromium nickel alloys from trivalent chromium—amide electrolytes

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Abstract
In the electrodeposition of chromium nickel alloys from trivalent chromium-amide electrolytes it is found that chromium II has a controlling role on the composition and quality of the deposited alloys. Inadequate control of the chromium II leads to variation in composition and eventually to poor quality black deposits. Electrolytically generated chromium II is shown to induce a rapid initial ageing of the bath with marked changes in the properties of the deposit and in the required operating conditions. The levels of electrolytically generated chromium II required for these effects are very low but must be adequately controlled for successful application of these baths. The required control of chromium II. necessary to sustain high quality codeposition of chromium nickel alloys of constant composition, is discussed.