CORROSION PROTECTING METHOD FOR WELD ZONE OF STAINLESS STEEL

摘要

PURPOSE:To reduce the amount of eluted ions by performing oxide film modifying heat treatment for improving the corrosion resistance in the TIG weld zone of a polished stainless steel without using, e.g. inert gas and independently of the restriction of its application, e.g. in the case of acid pickling. CONSTITUTION:The TIG weld zone of a polished stainless steel is heated in an atmosphere of =20vol.% oxygen content at 400-600 deg.C for 60-300min to undergo oxidizing treatment, by which the composition of the oxide film on the surface of weld heat-affected zone of the stainless steel can be modified and the corrosion in the weld zone of the stainless steel can be prevented.