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

1983-06-03

1985-05-14

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23F 710

Patent

active

045170290

ABSTRACT:
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 surface, 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 PO.sub.4, 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:PO.sub.4 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.

REFERENCES:
patent: 2859145 (1958-11-01), Somers
patent: 2884351 (1959-04-01), Cavanagh
patent: 3144360 (1964-08-01), Palm
patent: 3161549 (1964-12-01), Kallenbach
patent: 3218200 (1965-11-01), Henricks

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