Initiation and propagation of localized corrosion induced by(Zr,Ti,Al)-O_(x) inclusions in low-alloy steels in marine environment  

作　　者：Wen-zhui Wei Kai-ming Wu Jing Liu Lin Cheng Xian Zhang 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2021年第4期453-463,共11页

基　　金：The financial support from the National Natural Science Foundation of China(Nos.51601138 and 51601137)and the State Key Laboratory of Refractories and Metallurgy(No.2018QN18);is highly acknowledged.The authors are also grateful to the support from the 973 Program(No.2014CB643300);the 111 Project(No.D18018);Excellent Young and Middle-aged Science and Technology Innovation Team in Colleges and Universities of Hubei Province(No.T201903).

摘　　要：The effects of inclusions on localized corrosion of Zr–Ti deoxidized low-alloy steels in marine environment were investigated by various analytical techniques including scanning electron microscopy with X-ray microanalysis(SEM/EDS),confocal Raman microscopy(CRM),and in situ scanning vibrating electrode technique(SVET).It was found that complex(Zr,Ti,Al)-O_(x)inclusions were responsible for the initiation of localized corrosion.Localized corrosion pref-erentially occurred at Fe matrix adjacent to these inclusions and formed micro-gaps.In the early stage of corrosion,catalytic-occluded cells and the diffusion of chloride ions played a major role in the propagation of corrosion,further accelerating the dissolution of Fe matrix and(Zr,Ti,Al)-O_(x)inclusions.Combining SVET and CRM results,it revealed that the maximum anodic current density in local area gradually decreased with prolonged exposure time,indicating that corrosion products covered the steel surface and lowered the propagation rate of corrosion.In the later stage of corrosion,the barrier effect of corrosion products played an important role in inhibiting localized corrosion.

关 键 词：(Zr Ti Al)-O_(x)inclusion Localized corrosion Low-alloy steel Marine environment Scanning vibrating electrode technique 

分 类 号：TG142.1[一般工业技术—材料科学与工程]