Stress corrosion of pipeline steel under disbonded coating in a SRB-containing environment
Stress corrosion of pipeline steel under disbonded coating in a SRB-containing environment
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含SRB环境中脱粘涂层下管线钢的应力腐蚀
DOI：
10.1016/j.corsci.2019.06.026
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发表时间：
2019-08-15
影响因子：
8.3
通讯作者：
Ke, Wei
中科院分区：
文献类型：
--
作者：
Wu, Tangqing;Yan, Maocheng;Ke, Wei
在土壤环境中，模拟脱粘涂层下的局部环境，研究了X80管线钢在接种硫酸盐还原菌（SRB）缝隙中的应力腐蚀。结果表明，在缝隙中，SRB数、pH值和腐蚀速率均呈梯度分布。与对照试样相比，拉伸试样经受更严重的微生物腐蚀，并且在剥离缝隙中的点蚀严重性降低。外加应力使SRB接种缝隙中管线钢的局部点蚀和腐蚀速率增大。
Stress corrosion of X80 pipeline steel was studied in a sulfate-reducing bacteria (SRB) inoculated crevice simulating the local environment beneath disbonded coating in a soil environment. The results show that the SRB number, pH and corrosion rate of the steel all distribute in gradient in the crevice. The tensile specimens undergo more severe microbial corrosion compared with the control specimen and their pitting attack severity decreases in the disbonded crevice. Applied stress enhances both local pitting and corrosion rate of the pipeline steel in the SRB inoculated crevice.