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SO₄^2-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SO₄^2-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）SO₄^2-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：SO₄^2-的含量会影响X80钢的腐蚀行为，1%~5% SO₄^2-会阻碍Cl^-在电极表面的吸附，减缓腐蚀；高含量的SO₄^2-会破坏电极表面膜的形成，使腐蚀加速。

The influence of SO₄^2- 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 SO₄^2- was 5%, the weight loss and the corrosion current density of X80 pipeline steel were minimum. EIS results show that the concentration of SO₄^2- could affect the corrosion behavior of X80 steel. When the mass fraction of SO₄^2- was 1%~5%, SO₄^2- blocked the adsorption of Cl^- on the electrode surface, and slowed down the corrosion; the concentration of SO₄^2- could damaged the film forming on the electrode surface, and then accelerated the corrosion rate.