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Insight into microstructure evolution on anti-corrosion property of AlxCoCrFeNiC0.01 high-entropy alloys using scanning vibration electrode technique

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Abstract

The effect of microstructure on the corrosion resistance of AlxCoCrFeNiC0.01 (x = 0.2, 0.7, and 1.2) high-entropy alloys (HEAs) was systematically studied in this work. The microstructure evolution by regulating the Al content was analyzed in detail. Corrosion behavior was in situ monitored using the scanning vibration electrode technique, as well as some traditional electrochemical measurements. It is interesting to find that the compositions of body-centered cubic (bcc) and face-centered cubic (fcc) phases changed with the rising Al content, while the corresponding electrochemical responses for both phases were discriminated using the scanning Kelvin probe force microscopy method. Cr element was mainly distributed in the bcc phase for Al0.2 (x = 0.2) alloy, while its distribution changed to the fcc phase for the Al0.7 and Al1.2 alloys. The micro-galvanic corrosion cells formed between Cr-depleted and Cr-rich phases, resulting in the localized corrosion behaviors for the AlxCoCrFeNiC0.01 HEAs, and the order for anti-corrosion property was Al0.2 > Al1.2 > Al0.7 HEAs.

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摘要

本工作系统地研究了微观结构变化对AlxCoCrFeNiC0.01 (x=0.2, 0.7和1.2) 高熵合金（HEAs）耐蚀性能的影响。通过改变Al元素添加量来调控合金微观结构，采用扫描振动电极技术结合传统电化学测量方法对合金腐蚀行为进行了原位监测。结果表明：合金中的bcc和fcc相的组成随着Al元素含量的增加而发生改变，使用扫描开尔文探针分析两相的电化学响应。对于Al0.2合金，Cr元素主要分布在bcc相，而对于Al0.7和Al1.2合金，其分布改变为fcc相。贫铬区和富铬区之间形成微电偶腐蚀原电池，AlxCoCrFeNiC0.01 HEAs表现为局部腐蚀特征，耐蚀性能顺序为Al0.2＞Al1.2＞Al0.7 HEAs。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51971067 and 52001080), the Platform Research Capability Enhancement Project of Guangzhou University (No. 69-620939), and R&D Program of Joint Institute of GZHU & ICoST (Nos. GI202107 and GI202109).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China

    Bo-Kai Liao, Zhi-Gang Luo & Xing-Peng Guo

  2. School of Physics and Materials Science, Center of Advanced Functional Materials, Guangzhou University, Guangzhou, 510006, China

    Yue Liu, Hao-Wei Deng & Tao Zhang

  3. Joint Institute of Guangzhou University and Institute of Corrosion Science and Technology, Guangzhou University, Guangzhou, 510006, China

    Bo-Kai Liao, Hao-Wei Deng, Tao Zhang & Xing-Peng Guo

  4. Science and Technology Digitization Department, China General Nuclear Power Corporation, Shenzhen, 518038, China

    Zhan-Xiang Liang

  5. Institute of Nuclear Fuel and Materials, China Nuclear Power Technology Research Institute, Shenzhen, 518031, China

    Qi-Sen Ren & Hong-En Ge

  6. Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xing-Peng Guo

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Liao, BK., Liang, ZX., Luo, ZG. et al. Insight into microstructure evolution on anti-corrosion property of AlxCoCrFeNiC0.01 high-entropy alloys using scanning vibration electrode technique. Rare Met. 42, 3455–3467 (2023). https://doi.org/10.1007/s12598-023-02322-z

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