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4 MnS表面电势分布，MnS不同晶面的表面功函数图及MnS诱发局部腐蚀的机理图[29]

Fig.4 Surface potential distribution of MnS (a), surface work function of different crystal faces of MnS (b), the results show that the work function of MnS is smaller than that of Fe matrix, and mechanism diagram of local corrosion induced by MnS (c), MnS is used as an anodic corrosion couple with steel substrate to form steady or metastable pitting pits under the synergistic effect of Cl-and S, and the corrosion product “S” shell covers the surface of pitting pits to form concentration difference cells, further promote the corrosion process [29]