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

1985-09-26

1987-05-26

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 321, 204 51, C25D 536

Patent

active

046683488

ABSTRACT:
An activation solution is provided for forming adherent chromium electrodeposits on metal substrates, preferably ferrous metals such as cast iron, from high energy efficient chromium baths. The solution suitably is a mixture of sulfuric acid, added sulfate ion, and an inorganic oxidizing agent. A preferred solution contains 10 to 40% by volume concentrated sulfuric acid, 100 to 200 grams per liter of magnesium sulfate heptahydrate and 1 to 2 grams per liter of sodium nitrate.

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patent: 4472249 (1984-09-01), Chessin
Metal Finishing and Guidebook for 1978, Metals and Plastics Publications, Inc., Hackensack, N.J., pp. 130-131, 160-164.

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