采用动电位极化曲线、电化学阻抗谱(EIS)及三维视频显微镜技术研究了在酸性红壤模拟溶液中SO42-对X80管线钢腐蚀行为的影响.结果表明:随着酸性红壤模拟液中SO42-含量的增加,X80钢的腐蚀呈现出先减缓后明显加剧的趋势;在含5％(质量分数,下同)SO42-的模拟溶液中,X80钢的腐蚀失重量最低、腐蚀电流密度最小.结合EIS分析表明:SO42-的含量会影响X80钢的腐蚀行为,1％～5％SO42-会阻碍Cl-在电极表面的吸附,减缓腐蚀;高含量的SO42-会破坏电极表面膜的形成,使腐蚀加速.
The influence of SO42-on corrosion behavior of X80 pipeline steel in simulated acid red soil solution was investigated by analysis of potentiodynamic polarization curve,electrochemical impedance spectroscopy (EIS) and three-dimensional video microscopy.The results show that the corrosion rate of X80 steel firstly decreased and then substantially increased with the increase of SO4-2 concentration;when the mass fraction of SO42-was 5％,the weight loss and the corrosion current density of X80 pipeline steel were minimum.EIS results show that the concentration of SO42-could affect the corrosion behavior of X80 steel.When the mass fraction of SO42 was 1％～ 5 ％,SO42-blocked the adsorption of Cl on the electrode surface,and slowed down the corrosion;the concentration of SO42-could damaged the film forming on the electrode surface,and then accelerated the corrosion rate.
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