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3 在NS4溶液中浸泡24 h后Al-Ca-O-S夹杂物上形成的典型腐蚀坑[22,23]

Fig.3 Typical corrosion pits formed on Al-Ca-O-S inclusions after 24 h immersion in NS4 solution: (a) optical image, (b) 2D image, (c) three-dimensional profile, (d) height line, where the position of the cross-sectional profile is marked in Fig.3b as a red line [22], (e) schematic of dissolution kinetics of sulfide-oxide complex inclusions and the resulting local corrosion process: the original inclusions underwent the galvanic corrosion stage and the corrosion spreading stage, respectively [23]