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US 3,951,759 AGranted
Chromium electroplating baths and method of electrodepositing chromium
AssigneeRotel-Holding AG
InventorWalter Studer
Life of this patent
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Abstract
An aqueous acidic chromium electroplating bath comprising 200 to 550 g/l of chromium trioxide, 1 to 18 g/l of strontium sulfate, 2 to 30 g/l of potassium silicofluoride, 2 to 8 g/l of potassium dichromate and 4 to 50 g/l of 2,2-dichloromalonic acid or salt thereof.
Claims10
A bath for the electroplating of chromium comprising an aqueous acidic hexavalent chromium solution containing 200 to 550 g/l chromium trioxide, 1 to 18 g/l strontium sulfate, 2 to 30 g/l potassium silicofluoride, 2 to 8 g/l potassium dichromate, and as a synergetic additive 4 to 50 g/l 2,2-dichloromalonic acid or a salt thereof.
Dependencies are inferred from the claim text.