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US 4,062,740 AGranted
Bath for direct chrome-plating of calender rolls
OwnerWilhelm Bauer, Hans Bauerinventors
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Abstract
An electrolytic bath for direct chrome-plating of calender rolls is disclosed to which potassium aluminum sulfate and copper sulfate are added in order to increase the strength and stability of the chrome-plated layer deposited on the calender rolls.
Claims4
A bath for direct chrome-plating of calender rolls, consisting of an aqueous solution containing chromic acid (CrO.sub.3), sulfuric acid (H.sub.2 SO.sub.4) and fluosilicic acid (H.sub.2 SiF.sub.6), wherein the improvement in said bath comprises:
- copper sulfate (CuSO.sub.4) and potassium aluminum sulfate [KAl(SO.sub.4).sub.2 ].
Dependencies are inferred from the claim text.