Use of barium chromate as a sulfate scavenger in chromium electroplating baths
OwnerKenneth R. Newby, Allen R. Jones +1inventors
InventorsKenneth R. Newby, Allen R. Jones, John Meng
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Abstract
A sulfate scavenger for chromium-plating baths consists of barium chromate or dichromate or mixtures of the two, added either directly to the bath or as part of a replenishment mixture with chromic acid.
Claims21
In a chromium-plating bath for the electrodeposition of chromium onto a conductive substrate consisting essentially of chromic acid and sulfate ion, the improvement which comprises the addition of a compound selected from the group consisting of barium chromate, barium dichromate and mixtures thereof as a sulfate-ion scavenger.
In a chromium electroplating process, the improvement which comprises the use of a compound selected from the group consisting of barium chromate, barium dichromate and mixtures thereof as a sulfate-ion scavenger.
A replenishment mixture of chromic acid and a compound selected from the group consisting of barium chromate and barium dichromate for use in hexavalent chromium plating baths which continuously corrects for increasing sulfate ion concentrations.
Dependencies are inferred from the claim text.