中文摘要：

模拟混凝土失效不同时期的孔隙液环境,并通过循环极化曲线、电化学阻抗谱、M-S测试技术研究了304SS在模拟混凝土孔隙液中的耐蚀性。结果表明,在不同pH值以及不同Cl~-浓度模拟环境下,304SS钝化膜的耐蚀性随着pH值的降低以及Cl~-浓度的升高而降低;且在pH值为13的环境下钝化膜耐蚀性远高于pH值为9和11的,但在高pH值下孔蚀坑内流出的腐蚀产物会对钝化膜起破坏作用。通过电化学阻抗谱和M-S测试分析了不同pH值环境下钝化膜耐蚀性及其钝化膜半导体特征,表明在pH值为13的饱和NaCl环境下钝化膜电阻远高于pH值为9和11的,不同环境下304SS钝化膜在开路电位下均呈现N型半导体性质。表明海洋环境条件下,随混凝土碳化过程和Cl~-的富集造成的腐蚀环境改变会对304SS产生重要影响,304SS钝化膜稳定性降低,发生腐蚀的倾向性增加。

英文摘要：

The pore solutions of different periods of concrete lifetime were simulated by varying the pH value, then the corrosion performance of 304SS was studied by means of polarization curves, EIS, M-S testing technology in the simulated concrete pore solutions. It shows that the cor- rosion resistance of the formed passive film will decrease with the decreasing of pH value and in- creasing of the chloride ion concentration. The corrosion resistance of passive film formed in the solution with pH=13 is much higher than that in solutions with pH=9 and 11. It is expected that the concrete carbonation and the permeation of chloride ion may occur during the service of stainless steel reinforced concrete structures in marine environ- ments, which can have important impact on the passive film of 304SS, such as reducing the stabili- ty of the passive film and/or increasing the corrosion-susceptibility of the steel.