Abstract
A novel surface treatment for 316L SS by using magnetisation was studied, and the effects on the electrochemical behaviour and semiconductor properties were measured by potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS) and Mott–Schottky analysis in 3·5 wt-% NaCl solution. The results showed that the open circuit potential, corrosion potential Ecorr and charge transfer resistance Rt of the specimen markedly increased after the magnetisation treatment, while the passive current Ip decreased. Mott–Schottky analysis indicated that the donor densities of the passive films on the treated and untreated specimen are 3·83×1027 and 5·09×1027 m−3 respectively. In addition, the flat band potential of the treated specimen is more negative than that of the untreated specimen. These parameters (Nd and Efb) are closely related to the effects of magnetisation treatment on the anodic dissolution process of 316L SS.
The authors acknowledge the support of China National Natural Science Foundation (grant no. 51271023).