Inhibition Effect of Urotropin for Ultra-pure Ferritic Stainless Steel

Using urotropin as pickling inhibitor, the acid pickling recipe was improved, and the optimum technological parameters were obtain by orthogonal test. The results show that after acid pickling, a qualified compact passive film was formed on the surface of 44660 ultra-pure ferrite stainless steel, and the corrosion resistance was improved. The process solved the technological problem of under-pickling and over-pickling of 44660 ultra-pure ferrite stainless steel in actual production and thus may provide referential meaning for solving the problems about pickling of various ultra-pure ferrite stainless steel.