Method for appearance of old austenite grain boundary of alloy steel for machine structural use

摘要

Problem to be solved: to present an old austenite grain boundary of an alloy steel for mechanical structure without using picric acid.Solution: electrolytic corrosion of an alloy steel for machine structural use is performed using a corrosive liquid containing oxalic acid and sodium dodecylbenzene sulfonate or neutral detergent.No selection