ステンレス鋼のアノード分極特性における作用応力の影響と孔食

Abstract

The corrosion behavior of metal is closely related with its polarization behavior in a corrosive solution. Stainless steel was adopted as the testing material in this experiment and the anodic polarization curves were measured under various constant loads applied on the specimen in 3% NaCl solution. The results obtained are as follows. (1) The pitting initiation potential of SUS 430 was less-noble than SUS 316 and the pitting initiation potential shifted toward the less-noble side with increasing applied stress. (2) The passivity maintaining current increased with increasing applied stress. The pits in SUS 430 grew to deep pits and concentrated on the specified area of specimen surface. On the other hand the pits depth in SUS 316 was shallow and were dispersed over the specimen surface.