几种超级不锈钢在模拟烟气脱硫环境中的缝隙腐蚀行为研究

doi:10.11902/1005.4537.2017.215

中国腐蚀与防护学报

2019, Vol. 39

Issue (1): 43-50 DOI: 10.11902/1005.4537.2017.215

研究报告

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几种超级不锈钢在模拟烟气脱硫环境中的缝隙腐蚀行为研究

王长罡¹,魏洁¹,魏欣¹,穆鑫¹,薛芳¹,董俊华¹(

),柯伟¹,李国平²

1. 中国科学院金属研究所沈阳 110016
2. 山西太钢不锈钢股份有限公司太原 030003

Crevice Corrosion Behavior of Several Super Stainless Steels in a Simulated Corrosive Environment of Flue Gas Desulfurization Process

Changgang WANG¹,Jie WEI¹,Xin WEI¹,Xin MU¹,Fang XUE¹,Junhua DONG¹(

),Wei KE¹,Guoping LI²

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Technology Center of Taiyuan Iron and Steel Group Co. Ltd., Taiyuan 030003, China

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摘要:

在70 ℃的死亡绿液中，对316不锈钢以及超级不锈钢904L，254sMo和2507的人造缝隙电极进行了循环伏安测试和腐蚀形貌观察。结果表明，在70 ℃的死亡绿液中，254sMo和2507不锈钢具有良好的耐缝隙腐蚀能力，316和904L不锈钢的缝隙腐蚀损伤均十分严重。在缝隙边缘，316和904L不锈钢均呈现“蕾丝盖”结构，254sMo和2507不锈钢未见该腐蚀形貌。在缝隙腐蚀坑底部，超级双相不锈钢2507呈现电偶腐蚀的形貌特征。

关键词 ：超级不锈钢, 烟气脱硫, 死亡绿液, 人造缝隙电极, 缝隙腐蚀

Abstract：

The crevice corrosion of 316, 904L, 254sMo and 2507 stainless steels in a liquid of the so called green death at 70 ℃, which aims to simulate the corrosive environment of flue gas desulfurization process, was comparatively investigated by means of electrochemical cyclic polarization test and SEM. The results showed that 254sMo and 2507 stainless steel have excellent resistance to crevice corrosion, while the crevice corrosion induced damage of SS316 and SS904L is serious. The "lace cover" structures were observed on the edges of the gap of SS316 and SS904L, but not on that of SS254sMo and SS2507. At the bottom of crevice corrosion pit, duplex super stainless steel 2507 exhibits galvanic corrosion characteristics.

Key words： super stainless steel flue gas desulfurization death green solution artificial crevice electrode crevice corrosion

收稿日期: 2017-12-25

ZTFLH:

TG174

基金资助:国家自然科学基金(51071160);国家高技术研究发展计划(2015AA034301)

通讯作者: 董俊华 E-mail: jhdong@imr.ac.cn

Corresponding author: Junhua DONG E-mail: jhdong@imr.ac.cn

作者简介: 王长罡，男，1985年生，博士

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引用本文:

王长罡,魏洁,魏欣,穆鑫,薛芳,董俊华,柯伟,李国平. 几种超级不锈钢在模拟烟气脱硫环境中的缝隙腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(1): 43-50.
Changgang WANG, Jie WEI, Xin WEI, Xin MU, Fang XUE, Junhua DONG, Wei KE, Guoping LI. Crevice Corrosion Behavior of Several Super Stainless Steels in a Simulated Corrosive Environment of Flue Gas Desulfurization Process. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 43-50.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.215 或 https://www.jcscp.org/CN/Y2019/V39/I1/43

表1 4种不锈钢的合金元素成分及PREN值

图1 人造缝隙电极结构示意图及实物图

图2 316，904L，254sMo和2507不锈钢的人造缝隙电极在70 ℃死亡绿液中的循环伏安曲线

图3 4种不锈钢缝隙腐蚀数量统计图

图4 4种不锈钢缝隙腐蚀深度统计图

图5 316不锈钢人造缝隙电极在70 ℃死亡绿液中循环伏安测试后的腐蚀形貌

图6 904L不锈钢人造缝隙电极在70 ℃死亡绿液中循环伏安测试后的腐蚀形貌

图7 254sMo不锈钢人造缝隙电极在70 ℃死亡绿液中循环伏安测试后的腐蚀形貌

图8 2507不锈钢人造缝隙电极在70 ℃死亡绿液中循环伏安测试后的腐蚀形貌

图9 不锈钢缝隙腐蚀IR降机理示意图[14,15]

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