X80管线钢在CO_3^(2-)、HCO_3^-及Cl^-协同作用下的腐蚀行为  

Corrosion Behavior of X80 Pipeline Steel Under Synergistic Effect of CO_3^(2-),HCO_3^- and Cl^- Ions

作　　者：肖辉宗 谢飞[1] 吴明[1] 王丹[1] 赵威 罗小虎[3] 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]辽宁海泰科技发展有限公司,辽宁抚顺113001 [3]青海油田钻采工艺研究院,甘肃敦煌736200

出　　处：《材料保护》2017年第8期14-17,共4页Materials Protection

基　　金：国家自然科学基金(51574147;51604150);辽宁省博士启动基金(201601324)资助

摘　　要：目前,有关土壤介质中管线钢腐蚀的研究仅局限于单一环境因素的影响,环境因素协同作用的报道较少。通过正交试验法和动电位扫描技术对X80管线钢在高p H值模拟溶液中CO_3^(2-)、HCO_3^-及Cl^-等因素协同作用下的腐蚀行为进行研究。结果表明:CO_3^(2-)、HCO_3^-及Cl^-等因素的共同作用对X80钢腐蚀行为的影响较大;当CO_3^(2-)浓度由0.03 mol/L增大到0.09 mol/L时,X80钢的腐蚀电流密度逐渐增大,当CO_3^(2-)浓度为0.09 mol/L时,试样的腐蚀电流密度达到55.69μA/cm^2;随Cl^-浓度的不断降低,试样的腐蚀电流密度明显减小;随HCO_3^-浓度的升高,试样的腐蚀电流密度呈逐渐增大的趋势;HCO_3^-浓度对X80钢的腐蚀性影响最大,而CO_3^(2-)浓度对金属腐蚀性的影响最小。The synergistic effect of CO32-,HCO3-and Cl-ions on corrosion behavior of X80 pipeline steel in simulated soil solution with high pH value was investigated by potentiodynamic polarization and orthogonal test.Results showed that CO32-,HCO3-and Cl-ions had great influences on the corrosion behavior for X80 pipeline steel.With the increase of CO32-concentrations from 0.03 mol/L to 0.09 mol/L,the corrosion current density of X80 steel increased gradually.When the CO32-concentration was 0.09 mol/L,the corrosion current density of the sample was 55.69μA/cm2.As the Cl-concentration declined,the corrosion current density of the sample was significantly reduced.With the increase of HCO3-concentration,the corrosion current density of the sample showed a gradual increase trend.Furthermore,the corrosive influence of dissolved HCO3-on the X80 steel was maximal,while the corrosive effect of CO32-on metal was minimal.

关 键 词：土壤腐蚀 X80管线钢 协同作用 正交试验 

分 类 号：TE988.2[石油与天然气工程—石油机械设备] TG172.4[金属学及工艺—金属表面处理]