本文探讨了在不同 pH和Cl- 含量的模拟混凝土孔隙液介质中 ,混凝土中钢筋的腐蚀电化学行为 .电化学技术测试结果表明 ,正常情况下 ,钢筋在混凝土中受到高碱性环境的保护 ,耐蚀性好 .但随着介质 pH的降低、Cl- 含量的上升 ,钢筋腐蚀电流升高 ;动电位阳极极化曲线的测试表明 ,钢筋的维钝电流增大 ,击穿电位负移 ,混凝土中钢筋的耐蚀性下降 .这是钢筋表面钝性受破坏的缘故 . In this paper, the electrochemical corrosion behavior of steel bars in concrete with different pH and Cl-contents in simulated pore fluid media was discussed.The results of electrochemical tests show that under normal conditions, steel bars are protected by high alkaline environment in concrete, But the corrosion resistance is good, but with the decrease of medium pH and Cl- content, the corrosion current of steel increases; the anodic polarization curves of potentiodynamic test show that the increase of the blunt current, the negative breakdown potential of reinforced concrete, The corrosion resistance of the steel decreases, which is the reason why the steel surface is blunt and damaged.