组织配分对双相不锈钢微区极化行为及点蚀抗性的影响

doi:10.11902/1005.4537.2020.210

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 667-672 DOI: 10.11902/1005.4537.2020.210

研究报告

本期目录 | 过刊浏览

组织配分对双相不锈钢微区极化行为及点蚀抗性的影响

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武汉 430081

Effect of Microstructure Partition on Micro-polarization Behavior and Pitting Resistance of Duplex Stainless Steel

WANG Yicong, HU Qian, HUANG Feng, LIU Jing(

)

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

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摘要:

通过固溶处理制备了具有不同基体组成相比例的2205双相不锈钢试样，利用宏观电化学测试和微区极化测试，结合腐蚀形貌分析研究了组织配分对2205双相不锈钢微区极化行为及点蚀抗性的影响，探讨了α和γ单相微区电化学活性对2205双相不锈钢点蚀抗性的影响机制。结果表明：固溶处理改变了合金元素在α和γ两相中的分配以及两相的占比，对两相的微区电化学活性及两相间的电偶效应产生影响。当α相占比为60.8%时，两相具有最高的自腐蚀电位、最低的自腐蚀电流密度和最弱的微电偶效应，此时2205双相不锈钢具有最高的点蚀抗性。

关键词 ：双相不锈钢, 点蚀, 组织配分, 微区极化

Abstract：

2205 Duplex stainless steels (DSS) with different volume ratio of ferrite to austenite were prepared by solution treatment. Then their micro-polarization behavior and pitting resistance were studied by means of electrochemical measurement, micro-polarization measurement and corrosion morphology analysis. The effect of electrochemical activity of single α and γ phase on pitting resistance of 2205 DSS was also examined. Results show that the alloying element content and phase fraction of two phases changed after solution treatment, which influenced the micro-electrochemical activity of two phases and galvanic effect between two phases. When the phase fraction of α is 60.8%, the steel of two phases showed the highest corrosion potential, the lowest corrosion current density and the weakest galvanic effect. The 2205 DSS, in this case, possesses the best pitting resistance.

Key words： duplex stainless steel pitting microstructure partition micro-polarization

收稿日期: 2020-10-26

ZTFLH:

TG174

基金资助:国家自然科学基金(51871171)

通讯作者: 刘静 E-mail: liujing@wust.edu.cn

Corresponding author: LIU Jing E-mail: liujing@wust.edu.cn

作者简介: 汪毅聪，男，1997年生，硕士生

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引用本文:

汪毅聪, 胡骞, 黄峰, 刘静. 组织配分对双相不锈钢微区极化行为及点蚀抗性的影响[J]. 中国腐蚀与防护学报, 2021, 41(5): 667-672.
Yicong WANG, Qian HU, Feng HUANG, Jing LIU. Effect of Microstructure Partition on Micro-polarization Behavior and Pitting Resistance of Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 667-672.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.210 或 https://www.jcscp.org/CN/Y2021/V41/I5/667

图1 2205双相不锈钢的金相组织

表1 6种试样中两组成相占比及主要合金元素含量

图4 恒电位极化后6种试样表面点蚀形貌

图5 6种试样中两组成相上的点蚀密度统计

图6 1#、3#和5#试样中两组成相上的微区极化曲线

图7 3#试样微区极化测试后两组成相上的腐蚀形貌

图2 6种试样在60 ℃ 3.5%NaCl溶液中的极化曲线

图3 不同2205双相不锈钢试样的点蚀电位

表2 1#、3#和5#试样微区极化曲线拟合参数

图8 不同试样中α和γ两相PREN和对应的点蚀电位

表3 影响两相间微电偶效应的部分参数

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