304不锈钢在海洋环境混凝土模拟液中的腐蚀行为

doi:10.11902/1005.4537.2016.208

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 543-548 DOI: 10.11902/1005.4537.2016.208

研究报告

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304不锈钢在海洋环境混凝土模拟液中的腐蚀行为

苗伟行¹,胡文彬¹,高志明¹(

),孔宪刚¹,赵茹²,唐军务²

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

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

Weihang MIAO¹,Wenbin HU¹,Zhiming GAO¹(

),Xiangang KONG¹,Ru ZHAO²,Junwu TANG²

1. Tianjin Key Laboratory of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;
2. The Service Institute, Naval Engineering University, Tianji 300450, China

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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。

关键词 ： 304SS, 混凝土模拟液, 电化学阻抗谱, Mott-Schottkey, 循环极化曲线

Abstract：

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 corrosion resistance of the formed passive film will decrease with the decreasing of pH value and increasing 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 pH=11. It is noted that the insoluble corrosion product formed in solutions with higher pH spilled from corrosion pits will damage the passive film. The passive films formed in solutions with different pH values show characteristics of N-type semiconductor under open circuit potential, however the electrical resistance of the passive film formed in chloride saturated solutions with pH=13 is much higher than those 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 environments, which can have important impact on the passive film of 304SS, such as reducing the stability of the passive film and/or increasing the corrosion-susceptibility of the steel.

Key words： 304SS simulated concrete pore solution EIS Mott-Schottkey polarization curve

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

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引用本文:

苗伟行,胡文彬,高志明,孔宪刚,赵茹,唐军务. 304不锈钢在海洋环境混凝土模拟液中的腐蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(6): 543-548.
Weihang MIAO, Wenbin HU, Zhiming GAO, Xiangang KONG, Ru ZHAO, Junwu TANG. Corrosion Behavior of 304SS in Simulated Pore Solution of Concrete for Use in Marine Environment. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 543-548.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.208 或 https://www.jcscp.org/CN/Y2016/V36/I6/543

图1 304SS试样在不同浓度NaCl溶液中的循环极化曲线

图2 击穿电位与Cl-浓度的关系

图3 滞后环面积与Cl-浓度关系

图4 击穿电位随pH值的变化

图5 304SS试样在饱和NaCl溶液中不同pH值环境下的点蚀坑形貌

图6 304SS在pH值为9, 11和13的饱和NaCl溶液中浸泡72 h后的EIS图及其拟合电路

表1 304SS在pH值为9, 11和13的饱和NaCl溶液中浸泡72 h后的阻抗谱拟合数据

图7 304SS试样在不同pH值的饱和NaCl溶液中浸泡72 h后的M-S数据

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