304不锈钢在海洋环境混凝土模拟液中的腐蚀行为  

Corrosion Behavior of 304SS in Simulated Pore Solution of Concrete for Use in Marine Environment

作　　者：苗伟行 胡文彬[1] 高志明[1] 孔宪刚[1] 赵茹[2] 唐军务[2] MIAO Weihang HU Wenbin GAO Zhiming KONG Xiangang ZHAO Ru TANG Junwu(Tianjin Key Laboratory of Composite ＆ Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China The Service Institute, Naval Engineering University, Tianji 300450, China)

机构地区：[1]天津大学材料科学与工程学院天津市材料复合与功能化重点实验室,天津300350 [2]海军工程大学勤务学院,天津300450

出　　处：《中国腐蚀与防护学报》2016年第6期543-548,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(51131007);天津市自然科学基金项目(14JCYBJC17700);海军工程大学基金项目(HGDQNJJ15024)资助

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。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.

关 键 词：304SS 混凝土模拟液 电化学阻抗谱 Mott-Schottkey 循环极化曲线 

分 类 号：TG172.5[金属学及工艺—金属表面处理]