中文摘要：

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pH值模拟溶液中CO32-、HCO3-及Cl-等因素协同作用下的腐蚀行为进行研究.结果表明：CO32-、HCO3-及Cl-等因素的共同作用对X80钢腐蚀行为的影响较大;当CO32-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CO32-浓度为0.09 mol/L时,试样的腐蚀电流密度达到55.69 μA/cm2;随Cl-浓度的不断降低,试样的腐蚀电流密度明显减小;随HCO3-浓度的升高,试样的腐蚀电流密度呈逐渐增大的趋势;HCO3-浓度对X80钢的腐蚀性影响最大,而CO32-浓度对金属腐蚀性的影响最小.

英文摘要：

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.