加铜<strong>4Cr16Mo</strong>马氏体不锈钢在应力作用下的腐蚀研究

doi:10.11902/1005.4537.2023.132

中国腐蚀与防护学报

2023, Vol. 43

Issue (5): 1094-1100 CSTR: 32134.14.1005.4537.2023.132 DOI: 10.11902/1005.4537.2023.132

海洋材料腐蚀与防护及钢筋混凝土耐久性与设施服役安全专栏

本期目录 | 过刊浏览

加铜4Cr16Mo马氏体不锈钢在应力作用下的腐蚀研究

李佳媛¹^,², 曾天昊¹^,², 刘友通¹^,², 吴晓春¹^,²(

)

^1.上海大学材料科学与工程学院上海 200444
^2.上海大学高品质特殊钢冶金与制备省部共建国家重点实验室上海 200444

Corrosion Behavior of 4Cr16Mo Martensite Stainless Steel with 1% Cu Addition by Applied Stress

LI Jiayuan¹^,², ZENG Tianhao¹^,², LIU Youtong¹^,², WU Xiaochun¹^,²(

)

^1.School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
^2.State Key Laboratory of Metallurgy and Preparation of High Quality Special Steel, Shanghai University, Shanghai 200444, China

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摘要:

采用应力腐蚀实验方法，对比研究了添加1%Cu的4Cr16MoCu及4Cr16Mo两种材料在3.5%NaCl溶液中的耐蚀性能。结果表明，在低温250 ℃回火后，两种材料的耐蚀性能没有明显差异，但在600 ℃高温回火后，4Cr16MoCu材料的耐蚀性能显著增强，通过微结构分析推测，这与富铜相析出有关。通过腐蚀形貌及腐蚀形貌发展过程分析提出此材料在应力腐蚀下的腐蚀发展模型，即在腐蚀初期由于钝化膜破裂引起表面阴阳极区分，形成类电解抛光效应剥离表面钝化膜后进一步形成点蚀。

关键词 ：马氏体不锈钢, 富Cu相, 应力腐蚀, 类电解抛光效应

Abstract：

The corrosion resistance of 4Cr16Mo martensite stainless steels without and with 1%Cu addition (i.e., 4Cr16MoCu) in 3.5%NaCl solution was comparatively studied by three-point flexural loading stress corrosion test method. The results show that there is no significant difference in corrosion resistance between the two steels after tempering at 250 ℃. However, after tempering at 600 ℃, the corrosion resistance of 4Cr16MoCu steel is significantly enhanced. Through microstructure analysis, it is speculated that this is related to the precipitation of the Cu-rich phase. A stress corrosion model for the 4Cr16MoCu steel is proposed based on the characteristics and evolution process of corrosion morphology of the steel, i.e., in the early stage of corrosion, breaks of the passivation film may induce the emerging discrete anode- and cathode-spots on the steel surface, further result in an electrolytic polishing-like effect to peel off the surface passivation film and finally the pitting corrosion.

Key words： martensite stainless steel Cu-rich phase stress corrosion quasi-electrolytic polishing ion effect

收稿日期: 2023-05-04 32134.14.1005.4537.2023.132

ZTFLH:

TG171

基金资助:国家重点研发计划(2016YFB0300400)

通讯作者: 吴晓春，E-mail: xcwu@staff.shu.edu.cn，研究方向为先进模具材料及其表面处理

Corresponding author: WU Xiaochun, E-mail: xcwu@staff.shu.edu.cn

作者简介: 李佳媛，女，1994年生，博士生

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引用本文:

李佳媛, 曾天昊, 刘友通, 吴晓春. 加铜4Cr16Mo马氏体不锈钢在应力作用下的腐蚀研究[J]. 中国腐蚀与防护学报, 2023, 43(5): 1094-1100.
LI Jiayuan, ZENG Tianhao, LIU Youtong, WU Xiaochun. Corrosion Behavior of 4Cr16Mo Martensite Stainless Steel with 1% Cu Addition by Applied Stress. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1094-1100.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2023.132 或 https://www.jcscp.org/CN/Y2023/V43/I5/1094

表1 两种实验用钢的成分 (mass fraction / %)

图1 三点弯曲应力腐蚀实验示意图

图2 样品在100 MPa应力下的腐蚀形貌

图3 250 ℃回火后材料表面腐蚀产物拉曼光谱

图4 4Cr16MoCu-250 ℃回火样的局部腐蚀形貌

图5 4Cr16MoCu在600 ℃回火后的STEM图像及面扫描结果

图6 腐蚀圈形成模型

图7 4Cr16Mo材料的腐蚀后表面形貌

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