On the role of Te-RE alloying on the passive film and pitting corrosion behavior of 316L stainless steel
作者
单位
1School of Metallurgical and Ecological Engineering、University of Science and Technology Beijing、Beijing、China 2Institute of Advanced Materials & Technology、University of Science and Technology Beijing、Beijing、China 3National Materials Corrosion and Protection Data Center、University of Science and Technology Beijing、Beijing、China 4Vrije Universiteit Brussel、Department Materials and Chemistry (MACH)、Research Group Sustainable Materials Engineering (SUME)
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
This work reports the mechanism of corrosion resistance enhancement of 316L stainless steel after Te-RE alloying. The individual MnS inclusions are replaced by composite inclusions, resulting in a reduced risk of pitting corrosion. The Volta potential difference between the matrix and Te/La-containing inclusions is decreased, leading to improved stability of the inclusions. After the RE -Te composite treatment, the stainless steel exhibits the largest pitting potential and the strongest corrosion resistance. Te increases the content of Mo and Cr in the passive film and generates TeO2, which improves the densification of the passive film. La promoted the enrichment of Cr and Te in the passive film.