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The influence of cathodic protection potential on the biofilm formation and corrosion behaviour of an X70 steel pipeline in sulfate reducing bacteria media
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2017-12-01 , DOI: 10.1016/j.jallcom.2017.09.181
Tao Liu , Y. Frank Cheng

Abstract This work investigated the biofilm formation and microbiologically influenced corrosion (MIC) of a pipeline steel under cathodic protection (CP) in an extracted soil in solution with addition of sulfate reducing bacteria (SRB), Desulfovibrio desulfuricans . It was found that the application of CP did not affect the planktonic bacterial growth in the solution. The CP facilitated the bacterial attachment to the steel in this system, and a layer of biofilm formed on the cathodically protected steel, decreasing the CP effectiveness for corrosion protection. The CP potential of −850 mV vs. copper sulfate electrode (CSE) was not sufficient to protect the steel from corrosion in SRB containing media. Despite a further negative shift of the CP potential to −1000 mV vs. CSE was effective to control uniform corrosion of the steel, pitting corrosion still occurred under biofilm on the steel.

中文翻译:

阴极保护电位对X70钢管在硫酸盐还原菌介质中生物膜形成及腐蚀行为的影响

摘要 本工作研究了阴极保护 (CP) 下管线钢在添加硫酸盐还原菌 (SRB) 脱硫弧菌 (Desulfovibrio desulfuricans) 的溶液中提取的土壤中的生物膜形成和微生物影响腐蚀 (MIC)。发现CP的应用不影响溶液中浮游细菌的生长。CP 促进了细菌附着在该系统中的钢上,并在阴极保护的钢上形成了一层生物膜,降低了 CP 对腐蚀保护的有效性。与硫酸铜电极 (CSE) 相比 -850 mV 的 CP 电位不足以保护钢在含有 SRB 的介质中免受腐蚀。尽管与 CSE 相比,CP 电位进一步负移至 -1000 mV 可有效控制钢的均匀腐蚀,
更新日期:2017-12-01
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