组织配分对2002双相不锈钢点蚀萌生及扩展的影响

doi:10.11902/1005.4537.2020.183

中国腐蚀与防护学报

2021, Vol. 41

Issue (6): 837-842 DOI: 10.11902/1005.4537.2020.183

研究报告

本期目录 | 过刊浏览

组织配分对2002双相不锈钢点蚀萌生及扩展的影响

雷哲缘, 汪毅聪, 胡骞(

), 黄峰, 刘静

武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北省海洋工程材料及服役安全工程技术研究中心 430081

Effect of Microstructure Distribution on Pitting Initiation and Propagation of 2002 Duplex Stainless Steel

LEI Zheyuan, WANG Yicong, HU Qian(

), HUANG Feng, LIU Jing

Hubei Engineering Technology Research Center of Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要:

通过固溶处理得到含有不同占比和元素含量组成相的2002双相不锈钢试样，采用恒电位极化、动电位扫描和表面形貌分析，研究并探讨了组织配分对点蚀萌生及扩展规律及机理的影响。结果表明，随着固溶温度升高，主要合金元素向γ相聚集，α相含量增加，但耐蚀性下降，点蚀更倾向于在弱相α相上萌生，2002双相不锈钢整体点蚀抗性降低。点蚀发生时具有蕾丝花边形貌，蕾丝盖下的点蚀坑具有浅而宽的碟形特征。2002双相不锈钢点蚀抗性越好，点蚀坑越容易沿宽度方向扩展，对深度方向的扩展影响不大。

关键词 ：双相不锈钢, 组织配分, 点蚀萌生, 点蚀扩展

Abstract：

Test pieces of 2002 duplex stainless steel composed of different proportion of phases with various amount of alloying elements were prepared by solution treatment. The effect of microstructure partition on the pitting initiation and propagation of the steel in 3.5% (mass fraction) NaCl solution were investigated by means of potentiostatic polarization, potentiodynamic scanning and surface morphology analysis. Results show that with the increase of solution treatment temperature, the main alloying elements gather to γ phase, the volume faction of α phase increases but the anti-corrosion property of the steel decreases, therewith, pitting initiates on α phase more easily. As a consequence, the pitting resistance of 2002 DSS decreases. The formed pits present lacework-like morphology, beneath the cover of a lacework there is a dish-lie pit with larger mouth opening but shallower depth. In a word, 2002 duplex stainless steel exhibits better corrosion resistance, which may be ascribed to that the formed pits on the steel surface tend preferentially to grow laterally but not deeply.

Key words： duplex stainless steel microstructure distribution pitting initiation pitting propagation

收稿日期: 2020-10-03

ZTFLH:

TG172

基金资助:国家自然科学基金(51871171)

通讯作者: 胡骞 E-mail: huqian@wust.edu.cn

Corresponding author: HU Qian E-mail: huqian@wust.edu.cn

作者简介: 雷哲缘，男，1997年生，硕士生

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引用本文:

雷哲缘, 汪毅聪, 胡骞, 黄峰, 刘静. 组织配分对2002双相不锈钢点蚀萌生及扩展的影响[J]. 中国腐蚀与防护学报, 2021, 41(6): 837-842.
Zheyuan LEI, Yicong WANG, Qian HU, Feng HUANG, Jing LIU. Effect of Microstructure Distribution on Pitting Initiation and Propagation of 2002 Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 837-842.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.183 或 https://www.jcscp.org/CN/Y2021/V41/I6/837

图1 3种2002双相不锈钢试样金相组织

表1 3种2002双相不锈钢试样α和γ两相占比和主要元素分布

图2 3种2002双相不锈钢试样阳极极化曲线

图3 2002双相不锈钢试样恒电位极化后的点蚀形貌和点蚀密度

图4 2002双相不锈钢试样恒电位极化后的点蚀形貌和三维尺寸

图5 3种2002双相不锈钢试样中α和γ相的PREN值

图6 两种试样在恒电位极化后表面蕾丝花边形貌

图7 蕾丝盖形成示意图

图8 不同耐蚀性试样蚀坑横向扩展示意图

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