THE STRESS-CORROSION CRACKING OF SENSITIZED STAINLESS-STEEL IN THIOSULFATE SOLUTIONS

Low concentrations of about 6. 10** minus **7M Na//2S//2O//3 (0. 1 ppm) gave cracking. With boric acid added, higher concentrations (1 ppm) were required. The SCC was electrochemically controlled. Below -0. 5 V//S//C//E (-0. 75//S//H//E), no SCC took place; above this potential, the rate increased with potential. Straining was required before SCC continued at 0. 5 v if the potential was held at or below -0. 5 v for extended times.