硝酸钝化对304不锈钢在模拟混凝土孔隙液中点蚀的临界Cl<sup>-</sup>浓度的影响

doi:10.11902/1005.4537.2020.232

中国腐蚀与防护学报

2021, Vol. 41

Issue (6): 804-810 DOI: 10.11902/1005.4537.2020.232

研究报告

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硝酸钝化对304不锈钢在模拟混凝土孔隙液中点蚀的临界Cl^-浓度的影响

安易强, 王昕, 崔中雨(

)

中国海洋大学材料科学与工程学院青岛 266100

Effect of Nitric Acid Passivation on Critical Cl^- Concentration for Corrosion of 304 Stainless Steel in Simulated Concrete Pore Solution

AN Yiqiang, WANG Xin, CUI Zhongyu(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

全文: PDF(3137 KB) HTML

摘要:

通过动电位极化曲线、电化学阻抗谱以及Mott-Schottky测试研究了经硝酸钝化后的304不锈钢在模拟混凝土孔隙液中的耐蚀性。结果表明，硝酸钝化提高了304不锈钢在模拟混凝土孔隙液中点蚀的临界Cl^-浓度，未钝化处理及钝化0.5，2和24 h的临界Cl^-浓度分别为0.05~0.1，4~5，2~4和1~2 mol/L。Mott-Schottky测试结果表明，经硝酸钝化处理后304不锈钢的钝化膜载流子密度减小，膜稳定性增加，耐蚀性提高。

关键词 ： 304不锈钢, 硝酸钝化, 混凝土孔隙液, 点蚀, 临界Cl^-浓度

Abstract：

The corrosion resistance of 304 stainless steel passivated by nitric acid in simulated concrete pore solutions was studied through the polarization curves, electrochemical impedance spectroscopy (EIS) and Mott-Schottky measurement. The results indicate that the critical Cl^- concentration for the corrosion of 304 stainless steel in the simulated concrete pore solution was increased after nitric acid passivation. The bare steel and the steel subjected to passivation treatment for 0.5, 2 and 24 h presented different range of critical chloride ion concentrations, namely 0.05~0.1, 4~5, 2~4 and 1~2 mol/L, respectively. The Mott-Schottky test results show that the nitric acid passivation treatment reduces the carrier density of the passivation film and increases the stability of the film. The EIS measurement by potentiostatic polarization is suitable for detecting the critical Cl^- concentration.

Key words： 304 stainless steel nitric acid passivation concrete pore solution pitting corrosion critical Cl^- concentration

收稿日期: 2020-11-12

ZTFLH:

TG172

基金资助:中央高校基本科研业务费项目(201762008)

通讯作者: 崔中雨 E-mail: cuizhongyu@ouc.edu.cn

Corresponding author: CUI Zhongyu E-mail: cuizhongyu@ouc.edu.cn

作者简介: 安易强，男，1995年生，硕士生

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安易强, 王昕, 崔中雨. 硝酸钝化对304不锈钢在模拟混凝土孔隙液中点蚀的临界Cl^-浓度的影响[J]. 中国腐蚀与防护学报, 2021, 41(6): 804-810.
Yiqiang AN, Xin WANG, Zhongyu CUI. Effect of Nitric Acid Passivation on Critical Cl^- Concentration for Corrosion of 304 Stainless Steel in Simulated Concrete Pore Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 804-810.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.232 或 https://www.jcscp.org/CN/Y2021/V41/I6/804

图1 304不锈钢在含Cl-模拟混凝土孔隙液中的动电位极化测试

图2 304不锈钢不同钝化处理的点蚀电位与Cl-浓度的关系统计

图3 不同钝化处理的304不锈钢在恒电位550 mV极化后的EIS结果

图4 经不同时间钝化处理的304不锈钢在0.5 mol/L NaCl溶液中的EIS测试

表1 经不同时间钝化处理的304不锈钢在0.5 mol/L NaCl溶液中的EIS拟合结果

图5 304不锈钢不同钝化处理的Mott-Schottky测试结果

表2 n型半导体相关参数

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