H2S/CO2分压比和浸泡时间对P110SS钢腐蚀产物膜结构和性能的影响  

Effects of Partial Pressure Ratios of HS/CO and Immersion Time on the Structure and Properties of P110SS Steel Corrosion Product Film

作　　者：刘丽[1] 李佳蒙 王书亮[1] 鲍明昱 LIU Li;LI Jia-meng;WANG Shu-liang;BAO Ming-yu(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Southwest Institute of Technique and Engineering,Chongqing 400039,China;Safety,Environment&Technology Supervision Research Institute,PetroChina Southwest Oil&Gas Field Company,Chengdu 610041,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]西南技术工程研究所,重庆400039 [3]中国石油天然气股份有限公司西南油气田分公司安全环保与技术监督研究院,四川成都610041

出　　处：《材料保护》2020年第7期30-40,共11页Materials Protection

基　　金：国家自然科学基金资助项目(51374180)。

摘　　要：为了给抗硫套钢管的安全服役提供重要的理论依据,采用高温高压釜、SEM、EDS、XRD、极化曲线、电化学阻抗研究了90℃的H2S/CO2环境中P110SS钢腐蚀产物膜的生长机理,采用阴极极化的电化学阻抗和氢渗透曲线研究了H2S/CO2分压比对腐蚀产物膜保护性的影响。结果表明:在分压比为1∶0、1∶3、1∶7的腐蚀环境中形成的均是Fe S1-x腐蚀产物,经过5 h的腐蚀后,保护性最好,浸泡时间达到18 h时,其保护性最差,当浸泡时间达到72 h后,保护性提高。当浸泡时间为72 h时,随着CO2分压的增加,Fe S1-x腐蚀产物膜的保护性和抑制氢渗透的能力均逐渐增强。在分压比为0∶1的腐蚀环境中形成的是Fe CO3腐蚀产物膜,其保护性和抑制氢渗透的能力均随浸泡时间的增加而急剧增大,并且当浸泡时间均为72 h时,以上性能均高于Fe S1-x腐蚀产物膜。In order to offer important theoretical basis for the security service of anti-sulfur tubing steel,the formation mechanism of corrosion product films on P110SS steel in H2S/CO2environment at 90℃was studied by autoclave,scanning electron microscope (SEM),energy dispersive spectrometer (EDS),X-ray diffraction (XRD),polarization curves and electrochemical impedance spectrum.Moreover,the influences of corrosion products formed in H2S/CO2with various pressure ratios were researched by cathodic polarization electrochemical impedance and hydrogen permeability curve.Results showed that the corrosion product formed in the corrosive environment with the pressure ratios of 1∶0,1∶3 and 1∶7 was Fe S1-x.The corrosion films at 5 h had the optimal protective effect,while that at 18 h had the worst protective effect,which would be increased when the time rose to 72 h.When the immersion time was 72 h,the protective ability and hydrogen-permeation resistance of Fe S1-xcorrosion product film increased with the increase of CO2pressures.When the pressure ratio was0∶1,the Fe CO3corrosion product film formed,and the protective ability and hydrogen-permeation resistance increased sharply as the immersion time increased.Furthermore,when the immersion time was 72 h,the corrosion product films possessed the superior performances to FeScorrosion product films.

关 键 词：P110SS钢 H2S/CO2腐蚀 分压比 腐蚀产物膜 电化学 氢渗透 

分 类 号：TG172[金属学及工艺—金属表面处理]