缝隙几何尺寸对闭塞区化学环境及腐蚀行为的影响

doi:10.11902/1005.4537.2024.047

中国腐蚀与防护学报

2024, Vol. 44

Issue (6): 1581-1588 CSTR: 32134.14.1005.4537.2024.047 DOI: 10.11902/1005.4537.2024.047

研究报告

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缝隙几何尺寸对闭塞区化学环境及腐蚀行为的影响

许志昱¹, 胡骞¹(

), 黄峰¹, 刘静¹, 卢献忠²

1.武汉科技大学省部共建耐火材料与冶金国家重点实验室;湖北省海洋工程材料及服役安全工程技术研究中心武汉 430081
2.上海宝钢铸造有限公司上海 201900

Effect of Crevice Geometry on Chemical Environment of Crevice Solution and Corrosion Behavior of 2205 Duplex Stainless Steel

XU Zhiyu¹, HU Qian¹(

), HUANG Feng¹, LIU Jing¹, LU Xianzhong²

1. Hubei Engineering Technology Research Center of Marine Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2. Shanghai Baosteel Casting Co., Ltd., Shanghai 201900, China

引用本文:

许志昱, 胡骞, 黄峰, 刘静, 卢献忠. 缝隙几何尺寸对闭塞区化学环境及腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2024, 44(6): 1581-1588.
Zhiyu XU, Qian HU, Feng HUANG, Jing LIU, Xianzhong LU. Effect of Crevice Geometry on Chemical Environment of Crevice Solution and Corrosion Behavior of 2205 Duplex Stainless Steel[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1581-1588.

全文: PDF(10860 KB) HTML

摘要:

针对2205双相不锈钢在NaCl溶液中的缝隙腐蚀行为，设计缝内溶液化学环境测试及电化学实验装置，研究了缝隙腐蚀孕育期内Cl^-和H⁺的富集规律，以及发展期缝内电极的阳极溶解行为，探讨了缝隙高度和闭塞区体积对闭塞区化学环境和腐蚀行为的影响。结果表明，随着缝隙高度或闭塞区体积减小，在缝隙腐蚀孕育期，Cl^-和H⁺富集速率明显上升，H⁺浓度增加2个数量级。而在缝隙腐蚀发展期，OH^-浓度显著增大；而缝内电位降越小，缝内电极的阳极溶解速率就越大。

关键词 ：缝隙腐蚀, 不锈钢, 闭塞区

Abstract：

The chemical composition of the solution inside the crevice influences the initiation and development of crevice corrosion significantly, and the crevice geometry is an important factor which determines the chemical composition of the solution inside the crevice. Herein, the crevice corrosion behavior of 2205 duplex stainless steel in a NaCl solution was investigated by means of a home-made set for measurement of the solution composition and electrochemistry inside the crevice. The variation of Cl^- and H⁺ concentration during the crevice corrosion incubation period, and the anodic dissolution behavior of the electrode inside the crevice during the development period were characterized. Further, the effect of crevice gap size and solution volume of occluded area on the solution composition and corrosion behavior of occluded area were revealed. Results show that with the decrease of crevice gap or solution volume of occluded area, the enrichment rate of Cl^- and H⁺ increase significantly and the concentration of H⁺ increases by 2 orders of magnitude. The anodic dissolution rate of electrode inside crevice increases with the decrease of the potential drop inside the crevice.

Key words： crevice corrosion stainless steel occluded area

收稿日期: 2024-02-05 32134.14.1005.4537.2024.047

ZTFLH:

TG172

基金资助:湖北省重大攻关项目(JD)(2023BAA003)

通讯作者: 胡骞，E-mail：huqian@wust.edu.cn，研究方向为金属材料腐蚀与防护

Corresponding author: HU Qian, E-mail: huqian@wust.edu.cn

作者简介: 许志昱，男，1999年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.047 或 https://www.jcscp.org/CN/Y2024/V44/I6/1581

图1 2205 DSS微观组织形貌

图2 缝隙腐蚀实验装置和闭塞区尺寸调整示意图

图3 恒电位极化下不同缝隙溶液体积和缝隙高度时的电流时域图

图4 不同缝隙高度和闭塞区体积时Cl-浓度和pH随时间的变化

图5 不同缝隙高度和闭塞区体积时电极1的EIS谱(参比电极1)和等效电路

Time h	Crevice geometry parameter		Fitting parameters of EIS
Time h	V / mL	δ / μm	R_ct / Ω·cm²	R_s / Ω·cm²	R $s'$ / Ω·cm²	ΔR_s / Ω·cm²
16	1.2	300	3.87 × 10⁶	4.9	248.5	243.6
16	1.2	200	1.91 × 10⁶	5.2	260.5	255.3
16	1.2	100	1.27 × 10⁶	2.2	600.9	598.7
16	2.4	100	4.64 × 10⁶	9.8	425.5	415.7
16	3.6	100	8.30 × 10⁶	6.9	459.0	452.1
46	1.2	300	6.37 × 10³	5.5	323.1	317.6
46	1.2	200	9.79 × 10³	5.5	261.8	256.3
46	1.2	100	1.23 × 10⁵	9.2	575.9	566.7
46	2.4	100	1.83 × 10⁴	6.7	474.0	467.3
46	3.6	100	1.20 × 10⁴	9.4	456.7	447.3

表1 不同缝隙高度和闭塞区体积时电极1的EIS谱拟合参数

图6 不同缝隙高度和闭塞区体积时，极化16和46 h的宏观腐蚀形貌

图7 极化46 h后不同缝隙高度下电极1的微观腐蚀形貌

图8 极化46 h后不同缝隙溶液体积下电极1的微观腐蚀形貌

表2 极化16 h闭塞区溶液Cl-和H+的富集速率

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