<strong>HF</strong>溶液中<strong>316L</strong>应力腐蚀开裂行为研究

doi:10.11902/1005.4537.2024.132

中国腐蚀与防护学报

2024, Vol. 44

Issue (6): 1633-1640 CSTR: 32134.14.1005.4537.2024.132 DOI: 10.11902/1005.4537.2024.132

研究报告

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HF溶液中316L应力腐蚀开裂行为研究

张颛利¹, 戴海龙²(

), 张喆², 石守稳², 陈旭²(

)

1.中海油能源发展装备技术有限公司工业防护工程中心天津 300457
2.天津大学化工学院天津 300072

Stress Corrosion Cracking Behavior of 316L in Hydrofluoric Acid Solution

ZHANG Zhuanli¹, DAI Hailong²(

), ZHANG Zhe², SHI Shouwen², CHEN Xu²(

)

1. Industrial Protection Engineering Center, Cnooc Energy Development Equipment Technology Co., Ltd., Tianjin 300457, China
2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

引用本文:

张颛利, 戴海龙, 张喆, 石守稳, 陈旭. HF溶液中316L应力腐蚀开裂行为研究[J]. 中国腐蚀与防护学报, 2024, 44(6): 1633-1640.
Zhuanli ZHANG, Hailong DAI, Zhe ZHANG, Shouwen SHI, Xu CHEN. Stress Corrosion Cracking Behavior of 316L in Hydrofluoric Acid Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1633-1640.

全文: PDF(14066 KB) HTML

摘要:

采用慢应变速率拉伸试验(SSRT)和微观表征方法对316L不锈钢在HF溶液中的应力腐蚀开裂(SCC)机理进行了研究。316L不锈钢在HF溶液中表现出强烈的应力腐蚀敏感性，力学性能大大下降。应力腐蚀是由初期腐蚀产物膜撕裂以及随后力学和化学协同作用引发的点蚀共同导致的。316L不锈钢在HF溶液中表现出多源启裂特点，晶界、滑移台阶和δ铁素体与基体的相界均是裂纹萌生的主要位点。综上所述，机械变形诱发产物断裂是316L不锈钢在HF溶液中发生SCC的根本原因。

关键词 ：氢氟酸, 慢应变速率, 应力腐蚀开裂, 316L

Abstract：

The stress corrosion cracking (SCC) behavior of 316L stainless steel in HF solution was investigated by means of slow strain rate test (SSRT) and microscopy characterization. Results revealed that 316L stainless steel showed intense stress corrosion susceptibility in HF solution, correspondingly the mechanical property was greatly shortened for the tested steel. Stress corrosion is caused by the initial tear of the corrosion product film and the subsequent pitting corrosion caused by the synergistic action of mechanics and chemistry. The crack initiation of 316L stainless steel in HF solution shows the characteristics of multi-sites of initiation, i.e. the grain boundary, slip step and phase boundary between δ ferrite and matrix are the main sites of crack initiation. In all, mechanical deformation induced the rupture of corrosion products was essentially the inducement of SCC of 316L stainless steel in HF solution.

Key words： hydrofluoric acid slow strain rate test stress corrosion cracking 316L

收稿日期: 2024-04-23 32134.14.1005.4537.2024.132

ZTFLH:

TG172

基金资助:国家重点研发计划(2022YFC3004500)

通讯作者: 戴海龙，E-mail：hldai@tju.edu.cn，研究方向为材料腐蚀和应力腐蚀；
陈旭，E-mail：xchen@tju.edu.cn，研究方向为结构完整性

Corresponding author: DAI Hailong, E-mail: hldai@tju.edu.cn；
CHEN Xu, E-mail: xchen@tju.edu.cn

作者简介: 张颛利，男，1978年生，硕士，中级经济师

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.132 或 https://www.jcscp.org/CN/Y2024/V44/I6/1633

图1 SSRT试样几何尺寸

图2 316L不锈钢在空气和HF溶液中的应力-应变曲线和应力腐蚀敏感性

表1 316L不锈钢在空气和HF溶液中的基本力学参数

图3 316L不锈钢在空气和2%和10%HF溶液中SSRT后的断口形貌

图4 316L不锈钢在10%HF溶液中SSRT后的表面形貌

图5 316L不锈钢在10%HF溶液中SSRT后的表面撕裂特征及相应EDS的面扫描和线扫描结果

图6 316L不锈钢在10%HF溶液中SSRT后横截面和表面开裂特征SEM图

图7 316L不锈钢在10%HF溶液中SSRT后横截面开裂特征的EBSD结果

图8 δ铁素体引起的界面开裂和EDS线扫描结果以及δ铁素体和奥氏体两相纳米压痕结果

图9 316L不锈钢在HF溶液中的应力腐蚀开裂过程和蚀坑形成示意图

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