METHOD OF PRETREATING METAL SURFACES

摘要

A steel surface pre-treated with an oily material and a phosphating agent in which the surface is (a) first coated with up to 50 milligrams phosphating agent per square meter of surface, and then the oily material is coated on the surface; or (b) the phosphating agent and oily material are simultaneously coated on the surface to provide up to 50 milligrams of phosphating agent per square meter of surface and at least 150 milligrams of oily material per meter of surface; or (c) the phosphating agent and oily material are simultaneously coated on the surface to provide up to 150 milligrams of oily material per square meter of surface.