Stress corrosion cracking behavior of high-strength mooring-chain steel in the SO_(2)-polluted coastal atmosphere  

作　　者：Menghao Liu Zhiyong Liu Cuiwei Du Xiaoqin Zhan Xiaojia Yang Xiaogang Li 

机构地区：[1]Corrosion and Protection Center,University of Science and Technology Beijing,Beijing 10083,China [2]Zhengmao Group Co.,Ltd.,Zhenjiang 212000,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第6期1186-1196,共11页矿物冶金与材料学报（英文版）

基　　金：financially supported by the Fundamental Research Funds for the Central Universities(No.FRF-MP-18-002)。

摘　　要：21Cr2NiMo steel is widely used to stabilize offshore oil platforms;however,it suffers from stress-corrosion cracking(SCC).Herein,we studied the SCC behavior of 21Cr2NiMo steel in SO_(2)-polluted coastal atmospheres.Electrochemical tests revealed that the addition of SO_(2) increased the corrosion current.Rust characterization showed that SO_(2) addition densified the corrosion products and promoted pitting.Furthermore,slow strain rate tests demonstrated a high susceptibility to SCC in high SO_(2) contents.Fracture morphologies revealed that the stress-corrosion cracks initiated at corrosion pits and the crack propagation showed transgranular and intergranular cracking modes.In conclusion,SCC is mix-controlled by anodic dissolution and hydrogen embrittlement mechanisms.

关 键 词：corrosion marine atmospheres mooring-chain steel SO_(2)-polluted coastal atmospheres stress-corrosion cracking 

分 类 号：TE985[石油与天然气工程—石油机械设备]