Alloy plating
AssigneeEnthone Inc.
InventorWilhemus Maria Johannes Cornelius Verberne
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Abstract
There is disclosed an electroplating bath for depositing zinc/manganese alloys on a substrate characterized in that it comprises an aqueous bath free or substantially free of ammonium halide and of fluoroborate which is made up from 10-150 g/l, alkali metal salt, 30-90 g/l boric acid, 10-200 g/l water soluble zinc salt, 10-50 g/l water soluble manganese salt, 60-140 g/l alkali metal gluconate or tartrate and a base e.g. an alkali metal hydroxide to bring the pH to the range 6.1-7.1.
Claims15
An aqueous electroplating bath for depositing zinc/manganese alloys on a substrate, the bath being free or substantially free of ammonium halide and of fluoroborate, and comprising:
- from about 10 g/l to about 150 g/l alkali metal salt,
- from about 30 g/l to about 90 g/l boric acid,
- from about 10 g/l to about 200 g/l water soluble zinc salt,
- from about 10 g/l to about 50 g/l water soluble manganese salt,
- from about 60 g/l to about 140 g/l alkali metal gluconate or tartrate,
- and a base to bring the pH to the range of from about 6.1 to about 7.1.
An aqueous electroplating bath which comprises:
- from about 15 g/l to about 170 g/l sulphate ions,
- from about 4 g/l to about 50 g/l zinc ions,
- from about 3 g/l to about 16 g/l manganese ions,
- from about 35 g/l to about 90 g/l borate ions,
- from about 50 g/l to about 150 g/l gluconate or tartrate ions,
- and a pH in the range of from about 6.1 to about 7.2.
Dependencies are inferred from the claim text.