Stress Corrosion Cracking of X80 Steel in the Presence of Sulfate-reducing Bacteria  

作　　者：Tangqing Wu Maocheng Yan Dechun Zeng Jin Xu Cheng Sun Changkun Yu Wei Ke 

机构地区：[1]Environmental Corrosion Center,Institute of Metal Research,Chinese Academy of Sciences [2]School of Materials Science and Engineering,Xiangtan University [3]Key Laboratory of Materials Design and Preparation Technology of Hunan Province,Xiangtan University [4]Oil-Gas Storage and Transportation Company of Xinjiang Oilfield Branch

出　　处：《Journal of Materials Science & Technology》2015年第4期413-422,共10页材料科学技术（英文版）

基　　金：financial support of the National Natural Science Foundation of China(Nos.51471176 and 51131001);the National RD Infrastructure and Facility Development Program of China(No.2005DKA10400CT-2-02)

摘　　要：The systematic laboratory studies on the roles of sulfate-reducing bacteria(SRB) in the stress corrosion cracking(SCC) susceptibility of X80 steel subjected to cathodic potential have been conducted in a nearneutral pH soil solution by slow strain rate tests.The cathodic potential and SRB increase individually the SCC susceptibility of the steel in the soil solution.The positive role of the SRB activities in SCC susceptibility depends on the prolongation of pre-incubation time,and the SCC susceptibility of the steel increases under more negative potentials.What’s more,the applied potentials and the presence of SRB work together in promoting the SCC susceptibility of the steel.But,the combined action becomes limited with decreasing cathodic potentials.The relationships between the plasticity loss and the permeable hydrogen concentration were established for the steel in the soil solution,regardless of under open circuit potential or cathodic potentials,in both the sterile and SRB inoculated conditions.The relationships are practically significant for the selection of safe cathodic protection(CP) potentials in the presence of SRB in soil environment.The systematic laboratory studies on the roles of sulfate-reducing bacteria(SRB) in the stress corrosion cracking(SCC) susceptibility of X80 steel subjected to cathodic potential have been conducted in a nearneutral pH soil solution by slow strain rate tests.The cathodic potential and SRB increase individually the SCC susceptibility of the steel in the soil solution.The positive role of the SRB activities in SCC susceptibility depends on the prolongation of pre-incubation time,and the SCC susceptibility of the steel increases under more negative potentials.What’s more,the applied potentials and the presence of SRB work together in promoting the SCC susceptibility of the steel.But,the combined action becomes limited with decreasing cathodic potentials.The relationships between the plasticity loss and the permeable hydrogen concentration were established for the steel in the soil solution,regardless of under open circuit potential or cathodic potentials,in both the sterile and SRB inoculated conditions.The relationships are practically significant for the selection of safe cathodic protection(CP) potentials in the presence of SRB in soil environment.

关 键 词：Carbon steel Microbiologically influenced corrosio 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG172.9[金属学及工艺—金属材料]