Method for forming adherent, bright, smooth and hard chromium electrodeposits on ferrous metal substrates from high energy efficient chromium baths
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United States of America Patent
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May 26, 1987
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N/A
app pub date -
Sep 26, 1985
filing date -
Sep 26, 1985
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Expired
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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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