表面划痕对304不锈钢液滴腐蚀行为的影响

doi:10.11902/1005.4537.2020.281

中国腐蚀与防护学报

2022, Vol. 42

Issue (1): 99-105 DOI: 10.11902/1005.4537.2020.281

研究报告

本期目录 | 过刊浏览

表面划痕对304不锈钢液滴腐蚀行为的影响

程琪栋, 王燕华(

)

中国海洋大学化学化工学院海洋化学理论与技术教育部重点实验室青岛 266100

Effect of Surface Scratches on Corrosion Behavior of 304 Stainless Steel Beneath Droplets of Solution (0.5 mol/L NaCl+0.25 mol/L MgCl₂)

CHENG Qidong, WANG Yanhua(

)

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

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摘要:

采用电化学方法结合表面分析技术，研究了液滴下粗糙度和划痕深度对304不锈钢腐蚀行为的影响。研究表明，粗糙度和划痕深度的增加可以显著增加点蚀发生的概率，并缩短点蚀的诱发时间。点蚀孔呈浅盘状，点蚀孔的尺寸随粗糙度和划痕深度的增加而增大。根据二项分布检验，在低粗糙度或无划痕的情况下，点蚀孔倾向于随机分布，而在高粗糙度、划痕较深的情况下，点蚀孔倾向于出现在液滴边缘附近的划痕处。对点蚀区域的元素分布测试可见，点蚀的发生与液滴挥发、Cl^-浓度升高、导致Fe和Ni的氧化物等钝化膜的重要组成部分破坏有关。

关键词 ：不锈钢, 点蚀, 液滴, 粗糙度, 划痕

Abstract：

The effect of surface roughness and scratch depth on corrosion behavior of 304 stainless steel beneath droplets of solution (0.5 mol/L NaCl+0.25 mol/L MgCl₂) were studied by means of electrochemical method and the surface analysis techniques. It was found that the increase of roughness and scratch depth can significantly enhance the probability and shorten the induction time of pitting corrosion. The corrosion pits are shallow disk-shaped and the size of pits increases with the roughness and scratch depth. According to the distribution checking, the corrosion pits tend to distribute randomly on the surface of low roughness or no scratches, while they tend to appear at the scratches near the edge of the droplet on the surface of high roughness with deep scratches. According to the element distribution in the pitting region, it was found that the pitting corrosion was related to the evaporation of liquid droplets and the increase of Cl^- concentration, which led to the destruction of important components of the passivation film such as oxides of Fe and Ni.

Key words： stainless steel pitting corrosion droplet roughness scratch

收稿日期: 2020-12-30

ZTFLH:

TG174

基金资助:国家自然科学基金(51131005)

通讯作者: 王燕华 E-mail: wyhazz@163.com

Corresponding author: WANG Yanhua E-mail: wyhazz@163.com

作者简介: 程琪栋，男，1995年生，硕士生

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引用本文:

程琪栋, 王燕华. 表面划痕对304不锈钢液滴腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2022, 42(1): 99-105.
Qidong CHENG, Yanhua WANG. Effect of Surface Scratches on Corrosion Behavior of 304 Stainless Steel Beneath Droplets of Solution (0.5 mol/L NaCl+0.25 mol/L MgCl₂). Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 99-105.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.281 或 https://www.jcscp.org/CN/Y2022/V42/I1/99

图1 不同粗糙度不锈钢表面产生的点蚀概率，所对应的接触角与平均覆盖面积以及不锈钢表面不同划痕深度产生点蚀的概率

图2 304不锈钢的开路电位及不同粗糙和表面不同深度划痕不锈钢的点蚀诱发时间

图3 不同粗糙度的不锈钢表面的Mott-Schottky曲线

表1 具有不同粗糙度的不锈钢表面蚀孔的最大深度与等效直径

表2 施加不同深度划痕的不锈钢表面蚀孔的最大深度和等效直径

表3 不同粗糙度304不锈钢表面的点蚀分布

表4 304不锈钢表面不同深度划痕的点蚀分布

图4 不同粗糙度不锈钢表面点蚀位置及不同深度划痕点蚀分布二项分布检验所得的Z值

图5 点蚀区域SEM形貌及点蚀区域EDS测试结果

图6 不同划痕深度304不锈钢点蚀诱发过程机理

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