杀菌剂THPS对X80管线钢应力腐蚀开裂影响及机理研究  

Mitigation of Stress Corrosion Cracking of X80 Steel Induced bySulfate Reducing Desulfovibrio Vulgaris Biofilm Using THPS

作　　者：杨吉可 李众 王军磊 娄云天 李晓刚 YANG Jike;LI Zhong;WANG Junlei;LOU Yuntian;LI Xiaogang(Corrosion&Protection Center,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;National Materials Corrosion and Protection Data Center,Beijing 100083,China;Defense Engineering Institute,AMS,PLA,Henan Luoyang 471000,China)

机构地区：[1]北京科技大学新材料技术研究院腐蚀与防护中心,北京100083 [2]国家材料腐蚀与防护科学数据中心,北京100083 [3]军事科学院国防工程研究院,河南洛阳471000

出　　处：《表面技术》2024年第20期69-81,共13页Surface Technology

摘　　要：目的 研究杀菌剂THPS对X80管线钢应力腐蚀开裂的影响及机理。方法 37℃下,将X80钢U弯和10 mm×10 mm平片浸泡在接种了硫酸弧菌(Desulfovibrio vulgaris)的150 mL ATCC 1249培养基(添加杀菌剂THPS质量浓度为0、15、30、45、60 mg/L)中培养14 d。通过细胞计数实验、失重测试、H2S和H2测量、扫描电子显微镜(SEM)测试、激光共聚焦荧光显微镜(CLSM)测试、开路电位(OCP)、电化学阻抗(EIS)、线性极化电阻(LPR)、动电位极化测试、热力学计算和光电子能谱仪XPS,分别对X80钢在不同浓度杀菌剂含量的D.vulgaris中的腐蚀活动、应力腐蚀开裂裂纹生长情况、杀菌剂对生物膜的影响以及腐蚀产物进行分析。结果 失重、固着细胞计数和浮游细胞计数3项数据均呈现随着THPS浓度升高而下降的趋势。同时,SEM也可以观察到X80钢U弯在不同浓度下的THPS中形成的裂纹长度随着THPS的浓度增大呈减小趋势。OCP、EIS、LPR和动电位极化结果证实了杀菌剂THPS浓度增加导致微生物腐蚀活动下降,而较慢的微生物腐蚀活动减缓了X80钢的应力腐蚀开裂。通过理论计算确定了THPS对X80钢U弯的吸附类型。结论 杀菌剂THPS对SRB具有有效杀灭和驱散作用,从而减缓了X80钢的应力腐蚀开裂,THPS对X80钢U弯的吸附类型为静电导致的物理吸附和电荷交换导致的化学吸附二者兼有。Microbiologically influenced corrosion(MIC)is a relatively recent research area in the corrosion field.The most common corrosive microorganism in MIC is sulfate-reducing bacteria(SRB),Desulfovibrio vulgaris.Meanwhile,stress corrosion cracking(SCC)which is induced by both applied stress on the metal and corrosive circumstance,always causes ruptures in industrial fields such as pipelines or storage tanks,leading to severe economic losses.The metabolic activities of D.vulgaris provide corrosion on metal surfaces.Disaster accidents in the industry often occur when pipelines are subjected to both SCC and MIC.X80 pipeline steel is a widely used material for oil and gas pipelines which is susceptible to both MIC and SCC.Hence,it is important to investigate how to mitigate the SCC behavior of X80 steel induced by MIC under continuous mechanical stress,using the X80 U-bend coupon which provides continuous stress on the X80 steel.To solve this problem,biocide,such as Tetrakis hydroxymethyl phosphonium sulfate(THPS)was used to inhibit microbial growth.Meanwhile,different concentration of injected THPS has different intensity on the mitigation process of D.vulgaris activity.X80 U-bend coupons were immersed in ATCC 1249 culture medium(250 mL in 450 mL anaerobic bottles)inoculated with D.vulgaris.Following a 14-day incubation period of D.vulgaris in ATCC 1249 culture medium at 37℃with X80 U-bend coupons,the weight loss results were 2.7 mg/cm2(0 mg/L),1.4 mg/cm2(15 mg/L),1.1 mg/cm2(30 mg/L),0.7 mg/cm2(45 mg/L)and 0.5 mg/cm2(60 mg/L),respectively.The weight loss results indicate that the MIC rate declined with rising THPS concentration.When the THPS concentration is 60 mg/L,the MIC rate has been reduced to a relatively lower level.The sessile cell counts were 9.3×107 cells/cm2(0 mg/L),3.9×106 cells/cm2(15 mg/L),1.6×106 cells/cm2(30 mg/L),3.0×105 cells/cm2(45 mg/L),1.0×105 cells/cm2(60 mg/L),respectively.The planktonic cell counts were 2.1×106 cells/mL(0 mg/L),2.8×105 cells/mL(15 mg/L),1.2×105 cells/mL(30 mg/L),5.0×104

关 键 词：微生物腐蚀 硫酸盐还原菌 应力腐蚀开裂 杀菌剂 

分 类 号：TG174[金属学及工艺—金属表面处理]