17-4 PH不锈钢在含SRB的模拟海水中的应力腐蚀开裂行为研究

doi:10.11902/1005.4537.2019.207

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 523-528 DOI: 10.11902/1005.4537.2019.207

研究报告

本期目录 | 过刊浏览

17-4 PH不锈钢在含SRB的模拟海水中的应力腐蚀开裂行为研究

马鸣蔚¹, 赵志浩², 荆思文¹, 于文峰¹, 谷义恩¹, 王旭¹(

), 吴明²

1.辽宁石油化工大学机械工程学院抚顺 113001
2.辽宁石油化工大学石油天然气工程学院抚顺 113001

Corrosion Behavior of 17-4 PH Stainless Steel in Simulated Seawater Containing SRB

MA Mingwei¹, ZHAO Zhihao², JING Siwen¹, YU Wenfeng¹, GU Yien¹, WANG Xu¹(

), WU Ming²

1. School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China
2. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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摘要:

在硫酸盐还原菌 (SRB) 接种的模拟海洋溶液中，观察并研究了SRB和外加应力对17-4 PH不锈钢腐蚀行为的作用。分析应力-应变曲线和断口形貌，对比在无菌溶液和SRB接种溶液中的腐蚀行为差异。结果表明，与无菌溶液相比，SRB接种溶液中单级时效、双级时效和调质处理试样的I_SCC值分别提高了5.2%，9.3%和4.4%。FeS的产生增强了阳极溶解过程并加速了腐蚀反应，双级时效试样组织中粗大的马氏体有利于氢的进入和聚集，增加了试样对SRB的敏感度。单级时效和调质处理试样的应力腐蚀开裂 (SCC) 机理都是阳极溶解 (AD)，而双级时效试样是氢致开裂 (HIC)。

关键词 ： 17-4 PH不锈钢, 热处理, 应变量, SRB, 应力腐蚀开裂

Abstract：

The effect of sulfate-reducing bacteria (SRB) and applied stress on the corrosion behavior of 17-4 PH stainless steel was studied in a simulated marine solution inoculated with SRB. The stress-strain curves and fracture morphology were analyzed to acquire the differences in corrosion behavior induced by sterile solution and SRB inoculum solution respectively. The results showed that the I_SCC values were increased by 5.2%, 9.3%, and 4.4% in the SRB-inoculated solution for the steels subjected to single stage aging, double stage aging and tempering treatments respectively. The corrosion product of FeS enhances the anodic dissolution process and accelerates the corrosion reaction. Double stage aging treated steels are more sensitive to SRB due to the microstructure of coarse martensite, facilitating the entry and accumulation of hydrogen. The stress corrosion cracking (SCC) mechanism for single stage aging and tempering treated steels may be ascribed to the anodic dissolution (AD), while the double-stage aging treated steel may be due to the hydrogen induced cracking (HIC).

Key words： 17-4 PH stainless steel heat treatment strain SRB stress corrosion cracking

收稿日期: 2019-11-11

ZTFLH:

TG172.5

基金资助:国家自然科学基金(51574147)

通讯作者: 王旭 E-mail: wangxu@lnpu.edu.cn

Corresponding author: WANG Xu E-mail: wangxu@lnpu.edu.cn

作者简介: 马鸣蔚，女，2000年生

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引用本文:

马鸣蔚, 赵志浩, 荆思文, 于文峰, 谷义恩, 王旭, 吴明. 17-4 PH不锈钢在含SRB的模拟海水中的应力腐蚀开裂行为研究[J]. 中国腐蚀与防护学报, 2020, 40(6): 523-528.
Mingwei MA, Zhihao ZHAO, Siwen JING, Wenfeng YU, Yien GU, Xu WANG, Ming WU. Corrosion Behavior of 17-4 PH Stainless Steel in Simulated Seawater Containing SRB. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 523-528.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.207 或 https://www.jcscp.org/CN/Y2020/V40/I6/523

表1 17-4 PH不锈钢的化学成分

图1 用于应力腐蚀实验的试样尺寸及实验容器示意图

图2 经不同工艺处理的17-4PH不锈钢的显微组织

图3 经不同工艺热处理的17-4 PH不锈钢试样在不同环境中的应力-应变曲线及断面收缩率

表2 不同热处理后的试样在无菌和SRB接种溶液中的ISCC值

图4 经不同工艺热处理的17-4 PH不锈钢在不同环境中的断口形貌

图5 经不同工艺热处理的17-4 PH不锈钢试样在SRB接种溶液中的侧面断裂形貌

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