| 摘要 |
PURPOSE:To form stably a dense film having superior cold workability on a stainless steel material by using a treating soln. having a composition contg. oxalic acid, metallic ions, a fluorine compound, nitrate ions and a water soluble org. polymer other than protein. CONSTITUTION:The composition of a treating soln. for forming an oxalate film is composed of about 10-50g/l oxalic acid, about 0.1-10g/l ions of a metal such as Sn, about 0.1-5g/l (expressed in terms of F ions) fluorine compound, about 0.1-3g/l nitrate ions, about 1-10g/l water soluble org. polymer other than protein, e.g., polyvinylpyrrolidone, and water. A stainless steel wire rod is subjected to chemical conversion treatment with the treating soln. to form an oxalate film suitable for cold working. By this method, a film having high adhesion can be formed without adding a thiosulfate as an oxidation accelerator. The treating soln. has a long life and is advantageous to control.
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