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US 4,786,378 AGranted
Chromium electroplating baths having reduced weight loss of lead and lead alloy anodes
AssigneeM&T Chemicals Inc.
InventorKenneth R. Newby
Life of this patent
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Abstract
Weight loss of lead and lead alloy anodes is substantially reduced by including bismuth arsenic or antimony ions in the plating bath.
Claims8
A chromium electroplating bath in which solubilizing corrosion of a lead or lead alloy anode used therein is substantially reduced comprising:
- (a) a source of said chromium,
- (b) an alkyl sulfonic acid or salt thereof, wherein the S/C ratio is .gtoreq.1/3, and
- (c) a source of bismuth, arsenic or antimony ions as an additive therein, to reduce weight loss or pitting of said anode.
Dependencies are inferred from the claim text.