PASSIVATION AND STRESS-CORROSION CRACKING TENDENCY OF MANGANESE STAINLESS-STEELS

Stress corrosion cracking (SCC) behaviour of three grades of nickel-su bstituted manganese stainless steels have been studied at room tempera ture in 1 M HCl under constant load at different applied potentials. R epassivation studies have also been carried out using a scratching ele ctrode technique. Selective dissolution and film formation similar to that of films formed on alpha brass in ammoniacal solutions, were foun d to induce SCC in manganese stainless steels. With decrease in nickel content, these alloys were found to be highly susceptible to SCC.