Analysis of cracks origin behaviors during sulfide stress corrosion (SSC) in HSLA steel at different temperatures by electrochemical noise  

作　　者：Xiao-hua Li Chen-xi Liu Biao He Chuan-tao Lv Zhi-ming Gao Yong-chang Liu 

机构地区：[1]School of Mechanical Engineering,Tianjin University of Technology and Education,Tianjin 300222,China [2]State Key Lab of Hydraulic Engineering Simulation and Safety,School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China [3]Tianjin Pipe Corporation,Tianjin 300301,China

出　　处：《Journal of Iron and Steel Research International》2022年第11期1836-1845,共10页

基　　金：the National Natural Science Foundation of China(Grant Nos.51975404,52034004 and 52171123)for grant and financial support.

摘　　要：The sulfide stress corrosion(SSC)behaviors of the high strength low alloy steel at the different temperatures were investigated by the microstructural observation and electrochemical noise(EN)analysis.With the corrosion temperature increasing from 20 to 40℃,SSC ruptured time is prolonged.The increase in corrosion temperature results in the decrease of the saturation solubility of H_(2)S in the solution and thus increases pH value of solution.The increase in corrosion temperature decreases the size of the holes and cracks in the corrosion product film on the surface of the sample,which is due to the formation of the dense FeS corrosion product film.The current kurtosis results indicate that the time for the first occurrence of crack initiation is postponed by the increase in the corrosion temperature.The standard deviation of current noise signals,current kurtosis,power spectral density and energy distribution plot results shows a great consistency,which suggests that EN analysis method can reflect SSC behaviors in real time.

关 键 词：Sulfide stress cracking High strength low alloy(HSLA)steel Electrochemical noise Corrosion temperature Hydrogen sulfide corrosion products 

分 类 号：TG142[一般工业技术—材料科学与工程]