石油与天然气化工2025，Vol.54Issue(3)：108-115,8.DOI:10.3969/j.issn.1007-3426.2025.03.015
充氢条件下X70管线钢在含SRB环境中的电化学行为
Electrochemical behavior of X70 pipeline steel in SRB-containing environment under hydrogen-charged conditions
摘要
Abstract
Objective High-strength pipeline steel is highly susceptible to electrochemical corrosion in the marine environment containing sulfate reducing bacteria(SRB).If a large number of hydrogen atoms are infiltrated into the pipeline steel,the corrosion will be more serious,so it is necessary to investigate the electrochemical corrosion of X70 pipeline steel in the SRB environment under hydrogen-charged conditions.Method The electrochemical behavior of X70 pipeline steel under hydrogen-charged conditions in a simulated marine solution containing SRB of the South China Sea was systematically studied by electrochemical and surface analysis techniques.Through simulating the diffusion of different concentrations of hydrogen atoms into α-Fe,differential charge density maps and Fe—Fe bond energies,the effects of different concentrations of hydrogen atoms entering between Fe atoms were analyzed.Result When SRB were present,corrosion levels rose in tandem with increases in hydrogen charging.Additionally,higher hydrogen charging current density and longer hydrogen charging duration could promote forward corrosion.Conclusion The simulation of the South China Sea marine solution reveals that hydrogen is an important factor in the corrosion of X70 pipeline steel.The results of first principle calculations indicate that the presence of hydrogen atoms decreases the charge density between iron atoms,thereby weakening the Fe—Fe bonds in close proximity to the hydrogen atoms.As a consequence,in a corrosive environment,the structural integrity of the entire system will fail at these weakened locations,making them more susceptible to corrosion.关键词
X70管线钢/硫酸盐还原菌(SRB)/充氢条件/电化学行为/第一性原理Key words
X70 pipeline steel/sulfate reducing bacteria(SRB)/hydrogen-charged conditions/electrochemical behavior/first principle引用本文复制引用
杜荣佳,王丹,张瑛,谢飞,李天娇,吴明..充氢条件下X70管线钢在含SRB环境中的电化学行为[J].石油与天然气化工,2025,54(3):108-115,8.基金项目
国家自然科学基金"南海干湿交替中多因素耦合作用下X80管线钢应力腐蚀行为与机理研究"(52274062) （52274062）
辽宁石油化工大学创新创业训练计划项目"高强度钢在深海多因素耦合作用下析氢及渗氢机理研究"(202310148010) （202310148010）
