316L不锈钢在氯离子和CH3COOH介质环境中的应力腐蚀敏感性研究

李亮, 艾志斌, 陈中官, 严伟丽

doi:10.16577/j.issn.1001-1560.2022.0249

材料保护 >

2022 , Vol. 55 >Issue 9: 75 - 80

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0249

试验研究

316L不锈钢在氯离子和CH₃COOH介质环境中的应力腐蚀敏感性研究

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(1. 合肥通用机械研究院有限公司国家压力容器与管道安全工程技术研究中心，安徽合肥 230031；2. 中国石油化工股份有限公司镇海炼化分公司，浙江宁波 315207)

李亮(1991-)，助理工程师，硕士，研究方向为压力容器与管道用材料性能研究与应用，电话：18156838840，E - mail：liangdle@163.com

收稿日期: 2022-04-20

修回日期: 2022-05-31

录用日期: 2022-06-21

网络出版日期: 2023-12-23

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Study on Stress Corrosion Sensitivity of 316L Stainless Steel in Medium Enviornment Containing Cl^- and CH₃COOH

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(1.National Safety Engineering Technology Research Center for Pressure Vessels and Pipeline, Hefei General Machinery Research Institute Co., Ltd., Hefei 230031, China;2. SINOPEC Zhenhai Refining & Chemical Co., Ltd., Ningbo 315207, China)

Received date: 2022-04-20

Revised date: 2022-05-31

Accepted date: 2022-06-21

Online published: 2023-12-23

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摘要

目前关于316L不锈钢在含Cl-和CH3COOH环境中的应力腐蚀敏感性研究较少。为此，采用慢拉伸试验、扫描电镜(SEM)及X射线光电子能谱(XPS)等分析手段研究了Cl-和CH3COOH对316L不锈钢应力腐蚀敏感性的影响。结果表明：当Cl-浓度大于2 000 mg/L 时，316L不锈钢应力腐蚀倾向明显，且随Cl-浓度增加，其应力腐蚀敏感性呈加速增大趋势。加入CH3COOH后，低浓度Cl-条件下，CH3COOH会促进应力腐蚀；当Cl-达到1 000 mg/L 后，CH3COOH对应力腐蚀起抑制的作用。由XPS结果可知，CH3COOH会改变316L不锈钢钝化膜的组成，致使其耐腐蚀性增强。

关键词： 316L不锈钢; Cl-; CH3COOH; 应力腐蚀

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李亮, 艾志斌, 陈中官, 严伟丽 . 316L不锈钢在氯离子和CH₃COOH介质环境中的应力腐蚀敏感性研究[J]. 材料保护, 2022 , 55(9) : 75 -80 . DOI: 10.16577/j.issn.1001-1560.2022.0249

Abstract

At present, there are few studies on the stress corrosion sensitivity of 316L stainless steel in the environment containing Cl- and CH3COOH. In this paper, the effects of Cl- and CH3COOH on the stress corrosion sensitivity of 316L stainless steel were studied by slow strain rate tensile test, scanning electron microscopy (SEM) and X - ray photoelectron spectroscopy (XPS). Results showed that when the concentration of Cl- was higher than 2 000 mg/L, the stress corrosion tendency of 316L stainless steel was obvious, and the stress corrosion sensitivity of 316L stainless steel increased with an increasing rate while the Cl- concentration rised. Under the condition of low concentration of Cl-, CH3COOH could exacerbate stress corrosion. When the concentration of Cl- reached 1 000 mg/L, CH3COOH could inhibit stress corrosion. The XPS results revealed that CH3COOH could change the composition of 316L stainless steel passivation film and then improve its corrosion resistance.

Key words： 316L stainless steel; Cl-; CH3COOH; stress corrosion

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