Process for the cold forming of iron and steel

Details Process for the cold forming of iron and steel Process for the cold forming of iron and steel

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/82 (2006.01) C23C 22/22 (2006.01) C23C 22/83 (2006.01)

Patent

CA 1198655

ABSTRACT OF THE DISCLOSURE Iron and steel articles to be subjected to a cold forming operation are treated with a phosphatizing solution to form a zinc phosphate film on the surfaceg which film contains from about 5 to 80% by weight of the total film of zinc calcium phosphate. Thereafter, a soap type lubricant coating is applied to the zinc phosphate film. Preferably, the zinc phosphate film is formed on the surface by treating it with a phosphatizing solution which comprises from about 0.1 to about 0.35% by weight calcium ion, from about 0.1 to about 1.5% by weight zinc ion, from about 0.5 to about 3.0% by weight PO4, and from about 3.0 to about 5.0% by weight nitrate ion, which solution has a weight ratio of calcium ions : zinc ions of about 0.1-1.0 : 1 and a weight ratio of nitrate ions : PO4 of about 1.0-5.0 : 1. One or more of nickel, copper or cobalt ions may also be included in the phosphatizing solution in a total amount of from about 0.01 to about 0.2% by weight of the solution.

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