复配杀菌缓蚀剂对N80钢在SRB环境中微生物腐蚀行为的影响  

Effect of Compound Bactericidal Corrosion Inhibitor on Corrosion Behavior of N80 Steel at Different Temperatures

作　　者：胥聪敏[1] 李雪丽 付安庆 孙姝雯 陈志强 李城臣 XU Congmin;LI Xueli;FU Anqing;SUN Shuwen;CHEN Zhiqiang;LI Chengchen(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;State Key Laboratory for Performancce and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an 710077,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]中国石油集团工程材料研究院有限公司石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077

出　　处：《材料研究学报》2025年第2期145-152,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51974245,21808182);陕西省重点研发计划(2020GY-234);西安石油大学材料科学与工程学院西安市高性能油气田材料重点实验室,陕西省高等学校重点实验室“油气田腐蚀防护与新材料”,西安石油大学研究生创新与实践能力培养项目(YCS22213138)。

摘　　要：采用生物培养技术、失重实验、电化学测试和表面分析等手段研究了硫酸盐还原菌(SRB)在不同温度对N80钢腐蚀行为的影响和在SRB环境中复配杀菌缓蚀剂对N80钢缓蚀性能的影响。结果表明,N80钢在不同温度的腐蚀速率与SRB的活性成正比,37℃活性最高的SRB使N80钢表面的极化电阻R_(p)最小,腐蚀最严重,腐蚀速率(0.03553 mm/a)最高,分别是20和50℃时的1.53倍和1.16倍。加入复配杀菌缓蚀剂使N80钢20和37℃的R_(p)值显著增大,腐蚀受到抑制,缓蚀率分别高达65.45%与64.79%。其原因是,复配杀菌缓蚀剂中的杀菌剂四羟甲基硫酸磷(THPS)中的亲油基团羟甲基进入细菌细胞膜改变了蛋白质的特性而使细菌死亡;增效渗透剂二甲基亚砜促进THPS的羟甲基进入细菌细胞膜内提高了杀菌效果;而杀菌增强剂D-络氨酸作为信号分子使生物膜分解脱落,破坏了浓差环境,使腐蚀减缓;缓蚀剂中的壳聚糖与Fe^(2+)结合生成一层保护膜保护了基体,从而降低了腐蚀速率。N80钢在50℃的缓蚀率仅为0.26%,因为过高温度使缓蚀剂分子的运动加剧,使吸附在N80钢表面的分子解吸率提高和吸附膜解离,导致缓蚀率下降到极低。The effect of sulfate-reducing bacteria(SRB)on the corrosion behavior of N80 steel in SRB containing solution at 20,37 and 50℃,and for this case the effectiveness of a compound bactericidal corrosion inhibitor in the bactericidal effect and corrosion inhibition performance of N80 steel were comparatively investigated via biological culture technique,weightlessness measurement electrochemical testing,and surface analysis etc.The results showed that the corrosion rate of N80 steel was proportional to the SRB activity at different temperatures.The SRB activity was the highest at 37℃,the polarization resistance Rp of N80 steel was the smallest,and the corrosion rate(0.03553 mm/a)was the largest,which was 1.53 times of that at 20℃ and 1.16 times of that at 50℃,thus the corrosion was the most serious.However,after adding the compoundbactericidal corrosion inhibitor,the Rp value of N80 steel at 20 and 37℃ were increased significantly,and the corrosion of the steel was effectively inhibitedwith corrosion inhibitionefficiency of 65.45% and 64.79%,respectively.This is mainly due to that the lipophilic group hydroxymethyl of the bactericide tetrahydroxymethyl phosphate sulfate(THPS),as one of the components of the compound bactericide corrosion inhibitor,enters the bacterial cell membrane,changes its protein properties,then resulting in bacteria death;Meanwhile the dimethyl sulfoxide promotes the hydroxymethyl of THPS to enter the bacterial cell membrane and enhances the bactericidal effect.As a signal molecule,D-tyrosine,a bactericidal enhancer,promotes the decomposition of biofilm,destroys the surrounding concentration difference,thus slows down the corrosion.The Chitosan in the corrosion inhibitor combined with Fe2+to produce a protective film to protect the substrate,thereby,reducing the corrosion rate.However,at 50℃,the corrosion inhibition efficiency for N80 steel was only 0.26%,which is due to that the excessive temperature intensifies the movement of corrosion inhibitor molecular,increase in the molecula

关 键 词：金属材料 硫酸盐还原菌 复配杀菌缓蚀剂 生物膜 腐蚀行为 

分 类 号：TQ152[化学工程—电化学工业]