| 摘要 |
PURPOSE:To rapidly form an oxalate film on a Cr-Ni steel when the steel is subjected to oxalate film forming treatment as pretreatment for cold working, by treating the steel with sulfuric acid immediately before the oxalate film forming treatment so as to activate the surface. CONSTITUTION:A Cr-Ni stainless steel is subjected to oxalate film forming treatment as pretreatment for cold working. At this time, the steel is treated with sulfuric acid having 10-50g/l concn. immediately before the oxalate film forming treatment so as to activate the surface. By the activation, the parkerizing time can be shortened, so Fe and Cr ions hardly dissolve in a parkerizing soln. from the steel and the service life of the soln. is remarkably prolonged.
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