采用极化曲线和电化学阻抗技术研究了模拟液中Cl-/SO_4~(2-)比例及溶液浓度对钢筋在模拟混凝土孔隙液中腐蚀行为的影响。结果表明:当模拟液中m(Cl-)/m(SO_4~(2-))为1.5时,即溶液为亚氯盐渍土模拟液时,钢筋的腐蚀速率最大。钢筋的腐蚀速率随溶液中SO_4~(2-)含量的增加呈先增大后减小趋势,在模拟混凝土孔隙液介质中,一定含量的SO_4~(2-)会促进钢筋的腐蚀,而通过成比例增加溶液中SO_4~(2-)及Cl-的含量,模拟腐蚀的渐变过程,发现钢筋的腐蚀速率逐渐减小。电镜形貌分析进一步说明腐蚀速率的减小与钢筋电极表面盐膜形成而导致的阴极过程扩散阻力有关。 The polarization curves and electrochemical impedance spectroscopy were used to study the effect of Cl- / SO 4 2- ratio and solution concentration on the corrosion behavior of steel bars in simulated concrete pore fluids. The results show that when m (Cl -) / m (SO_4 ~ (2-)) in the simulated liquid is 1.5, the corrosion rate of the steel bar is the highest when the solution is the simulated solution of the chlorite saline soil. The corrosion rate of steel increases firstly and then decreases with the increase of SO 4 2- content in the solution. In the simulated concrete pore fluid medium, a certain amount of SO 4 2- will promote the corrosion of the steel bar, The content of SO 4 2- and Cl- in the solution was increased proportionally to simulate the gradual change of corrosion and found that the corrosion rate of reinforcing steel decreased gradually. Electron microscopy morphological analysis further shows that the decrease of corrosion rate is related to the diffusion resistance of cathodic process caused by the formation of salt film on the surface of steel electrode.