Method for forming adherent, bright, smooth and hard chromium el

Details Method for forming adherent, bright, smooth and hard chromium el Method for forming adherent, bright, smooth and hard chromium el

1985-10-15

1987-05-12

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 51, C25D 536

Patent

active

046647597

ABSTRACT:
An activation solution is provided for forming adherent chromium electrodeposits on stainless steel substrates from high energy efficient chromium baths. The activation solution suitably is a mixture of chromium acid, and chloride ion, or a mixture of chloride and bromide ions. A preferred solution contains 0.15M chromic acid and 0.14M chloride ion, or with 0.025M bromide ion, and the stainless steel is anodically etched in the activation solution at about 55.degree. C.

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patent: 4472249 (1984-09-01), Chessin
patent: 4474651 (1984-10-01), Yauchi et al.
Metal Finishing Guidebook and Directory for 1978, Metals and Plastics Publications, Inc., Hackensack, N.J., pp. 194, 202-205, 131-132.

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