Abstract
The effects of the temperature on the anodic polarization behaviour of SUS 304 and SUS 316 stainless steels were studied in a sodium-chloride solution in the temperature range of -10 to 35°C. The results obtained were summarized as follows. (1) Anodic polarization curves for SUS 304 in NaCl solution at ca. 0°C showed two pitting potentials, namely, the lower and the upper pitting potentials. The anodic loop due to pit-initiation and repassivation was observed between them. (2) The critical temperature below which anodic loop appears shifted in the lower temperature direction with increasing NaCl concentration. (3) Molybdenum in Cr-Ni stainless steel accelerates repassivation of pits formed in NaCl solution at low temperature. (4) Though the anodic polarization curves of SUS 304 and SUS 316 in chloride solution were similar to each other above room temperature, different behaviour was observed as the temperature was lowered to ca. 0°C.
