混凝土孔隙液中Cl<sup>-</sup>浓度对304不锈钢亚稳态点蚀的影响

doi:10.11902/1005.4537.2020.020

中国腐蚀与防护学报

2021, Vol. 41

Issue (2): 195-201 DOI: 10.11902/1005.4537.2020.020

研究报告

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混凝土孔隙液中Cl^-浓度对304不锈钢亚稳态点蚀的影响

刘欣怡¹^,², 赵亚州¹^,²(

), 张欢¹^,², 陈莉¹^,²

^1.河海大学海岸灾害及防护教育部重点实验室南京 210098
^2.河海大学港口海岸与近海工程学院南京 210098

Effect of Chloride Concentration in a Simulated Concrete Pore Solution on Metastable Pitting of 304 Stainless Steel

LIU Xinyi¹^,², ZHAO Yazhou¹^,²(

), ZHANG Huan¹^,², CHEN Li¹^,²

^1.Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University, Nanjing 210098, China
^2.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China

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摘要:

通过动电位极化和恒电位极化研究了Cl^-浓度对304不锈钢在模拟混凝土孔隙液 (pH 12.6) 中亚稳态点蚀的影响，并利用极值统计分布研究了亚稳态点蚀的峰值电流密度 (I_peak)，亚稳态点蚀半径 (r_pit)，亚稳态点蚀稳定性乘积 (I_peak·r_pit) 以及单个亚稳态点蚀的生长时间 (t_grow)，再钝化时间 (t_rep)，生长率 (K_grow) 和再钝化率 (K_rep)。结果表明，在碱性介质中，Cl^-浓度增加会促使亚稳态点蚀更易转变为稳定点蚀。

关键词 ：亚稳态点蚀, 动电位极化, 恒电位极化, 304不锈钢

Abstract：

The influence of chloride concentration on metastable pitting of 304 stainless steel in a simulated concrete pore solution (pH 12.6) was investigated via potentiodynamic polarization and potentiostatic polarization measurement. The peak current density (I_peak), metastable pit radius (r_pit), pit stability product (I_peak·r_pit), and growth time (t_grow), as well as the repassivation time (t_rep), growth rate (K_grow) and repassivation rate (K_rep) of individual metastable pits were studied by means of the extreme value statistics distribution method. The results revealed that the probability of transition from metastable pitting to stable pitting for 304 stainless steel might increase with the increasing chloride concentration in the simulated concrete pore solution.

Key words： metastable pitting potentiodynamic polarization potentiostatic polarization 304 stainless steel

收稿日期: 2020-02-18

ZTFLH:

TG172

基金资助:中央高校基本科研业务费专项资金(B200203003)

通讯作者: 赵亚州 E-mail: yazhou.zhao@hhu.edu.cn

Corresponding author: ZHAO Yazhou E-mail: yazhou.zhao@hhu.edu.cn

作者简介: 刘欣怡，女，1996年生，硕士生

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引用本文:

刘欣怡, 赵亚州, 张欢, 陈莉. 混凝土孔隙液中Cl^-浓度对304不锈钢亚稳态点蚀的影响[J]. 中国腐蚀与防护学报, 2021, 41(2): 195-201.
Xinyi LIU, Yazhou ZHAO, Huan ZHANG, Li CHEN. Effect of Chloride Concentration in a Simulated Concrete Pore Solution on Metastable Pitting of 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 195-201.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.020 或 https://www.jcscp.org/CN/Y2021/V41/I2/195

图1 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中的动电位极化曲线

图2 304不锈钢在含有0.01 mol/L Cl-的混凝土孔隙液中典型电流密度峰值

图3 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中的典型电流密度瞬变

图4 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中的Ipeak极值分布

图5 含有1 mol/L Cl-的模拟混凝土孔隙液中304不锈钢表面亚稳态点蚀形貌

图6 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中亚稳态点蚀半径的极值分布

图7 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中亚稳态点蚀稳定性乘积的极值分布

图8 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中亚稳态点蚀生长时间 (tgrow) 和再钝化时间 (trep) 的极值分布

图9 304不锈钢在含有不同Cl-浓度的混凝土孔隙液中亚稳态点蚀生长率 (Kgrow) 和再钝化率 (Krep) 的极值分布

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