低合金钢中夹杂物诱发局部腐蚀萌生机制的研究进展

刘超, 陈天奇, 李晓刚

Research Progress on Initiation Mechanism of Local Corrosion Induced by Inclusions in Low Alloy Steel

LIU Chao, CHEN Tianqi, LI Xiaogang

图1 3种冶金缺陷的LEIS的线性扫描结果[7]及Y-S-O夹杂物诱发点蚀萌生和发展的机理[12]

Fig.1 Linear scan results of LEIS for three metallurgical defects (a) [7], A, B and C being Si-rich inclusions, micropores and carbides, respectively, where the resistance at both A and B points is less than the substrate, whereas the resistance at C is greater than the substrate; mechanism diagram of pitting initiation and development induced by Y-S-O inclusions (b) [12], in which YS is preferentially dissolved as anodic phase and formed a corrosion microcouple with substrate and surface passivation film to induce local pitting initiation