Cold deformation process employing improved lubrication coating
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United States of America Patent
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Aug 10, 1993
Issued Date -
N/A
app pub date -
Jan 4, 1991
filing date -
Dec 20, 1984
priority date (Note) -
Expired
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Abstract
In the practice of the instant invention, a lubricating phosphate coating is applied to the surface of a ferrous-base metal article by contacting the surface with an aqueous acidic phosphate coating solution which contains an amount of hydroxylamine which is effective in increasing the rate at which the phosphate coating deposits from the solution. The resulting coated article is then subjected to cold deformation. In a preferred embodiment, the metal article is additionally contacted with a second lubricating compound after the phosphate coating is applied. In addition to phosphate, the coating solutions employed preferably contain one or more of the following ions: zinc, manganese, nitrate, nickel, ferrous, ferric, copper, fluoride, or mixtures thereof.
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