304不锈钢在模拟混凝土孔隙液中的点蚀行为研究

doi:10.11902/1005.4537.2020.238

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 646-652 DOI: 10.11902/1005.4537.2020.238

研究报告

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304不锈钢在模拟混凝土孔隙液中的点蚀行为研究

盖喜鹏, 雷黎, 崔中雨(

)

中国海洋大学材料科学与工程学院青岛 266100

Pitting Corrosion Behavior of 304 Stainless Steel in Simulated Concrete Pore Solutions

GAI Xipeng, LEI Li, CUI Zhongyu(

)

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

全文: PDF(4096 KB) HTML

摘要:

采用电化学测试方法研究了不同Cl^-浓度下，304不锈钢在两种模拟混凝土孔隙液中的点蚀行为，确定了304不锈钢的临界Cl^-浓度；采用SEM观察了304不锈钢表面钝化膜在临界Cl^-浓度前后的状态。结果表明，通过动电位极化和恒电位阻抗方法确定了304不锈钢的临界Cl^-浓度，且数值基本一致，并SEM观测结果相一致；而开路电位下的阻抗测试并不能确定临界Cl^-浓度。

关键词 ： 304不锈钢, 模拟混凝土孔隙液, 临界Cl^-浓度, 点蚀

Abstract：

The pitting corrosion behavior of 304 stainless steel in two simulated concrete pore solutions with different chloride ion concentrations was assessed via electrochemical measurement methods and SEM, in terms of the critical chloride ion concentration for pitting initiation and surface morphology before and after test of 304 stainless steel. The results showed that the critical chloride ion concentration of 304 stainless steel determined by potentiodynamic polarization and potentiostatic electrochemical impedance spectrum in saturated Ca(OH)₂ and HCO₃^-/CO₃^2- solutions were basically consistent. The SEM test results also confirmed the above conclusion. The electrochemical impedance acquired form open circuit potential measurement could not reveal the critical chloride concentration.

Key words： 304 stainless steel simulated concrete pore solution critical chloride ion concentration pitting corrosion

收稿日期: 2020-11-18

ZTFLH:

TG174

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: 盖喜鹏，男，1995年生，硕士生

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引用本文:

盖喜鹏, 雷黎, 崔中雨. 304不锈钢在模拟混凝土孔隙液中的点蚀行为研究[J]. 中国腐蚀与防护学报, 2021, 41(5): 646-652.
Xipeng GAI, Li LEI, Zhongyu CUI. Pitting Corrosion Behavior of 304 Stainless Steel in Simulated Concrete Pore Solutions. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 646-652.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.238 或 https://www.jcscp.org/CN/Y2021/V41/I5/646

图1 304不锈钢在含氯化物饱和Ca(OH)2溶液和HCO3-/CO32-碱性溶液中的极化曲线及临界Cl-浓度

图2 304不锈钢在含不同Cl-浓度的饱和Ca(OH)2溶液和HCO3-/CO32-碱性溶液中的开路电位下EIS图

图3 304 不锈钢在含不同Cl-浓度的饱和Ca(OH)2和HCO3-/CO32-碱性溶液中的恒电位下EIS图

图4 低于临界Cl-浓度和高于临界Cl-浓度的等效电路模型

表1 304 不锈钢在不同模拟混凝土孔隙液中的EIS拟合参数

图5 在不同模拟混凝土孔隙液中304不锈钢的Rtotal值随Cl-浓度的变化曲线

图6 在不同模拟混凝土孔隙液中304 不锈钢恒电位极化后的SEM像

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