通过模拟氯离子环境下混凝土中钢筋所处的锈蚀环境, 并以周期浸泡腐蚀试验加速钢筋的锈蚀, 采用腐蚀失重和腐蚀过程pH值监控方法研究了氯离子环境下钢筋锈蚀的规律。结果表明, 随Cl-浓度提高, 钢筋周期浸泡腐蚀速率总体呈现先增加后降低的规律。随着pH值的降低, 钢筋腐蚀经过钝化区、破钝化区和活化区。在破钝化区(pH=12.3～11), 钢筋腐蚀速率迅速升高。钢筋腐蚀引起的pH值降低要远大于Ca(OH)2碳化引起的pH值降低。

The corrosion rules of rebar steel in simulated chloride environments were studied by accelerating corrosion test of dry-wet cyclic immersion through measuring the corrosion weight loss of reinforcing steel and monitoring the change of pH value in the process of reinforcing steel corrosion. The results showed that the corrosion rate of rebar increased first and then decreased with the increase of Cl- concentration. With decreasing the pH value, the corrosion process of reinforcing steel passed the passivation area, depassivation area and activation area. In the depassivation area (pH =12.3～11), the corrosion rate of reinforcing steel increased rapidly. The decrease of pH value caused by reinforcing steel corrosion was much larger than that caused by the carbonation of Ca(OH)2.