共晶高熵合金AlCoCrFeNi2.1 在H2SO4 溶液中的腐蚀行为
收稿日期: 2022-05-12
修回日期: 2022-06-30
网络出版日期: 2022-07-15
基金资助
广东省区域联合基金-青年基金项目(2021A1515110560)
Corrosion Behavior of AlCoCrFeNi2.1 Eutectic High-Entropy Alloy in Sulfuric Acid Solution
Received date: 2022-05-12
Revised date: 2022-06-30
Online published: 2022-07-15
Supported by
Guang Dong Basic and Applied Basic Research Foundation(2021A1515110560)
利用电化学测试、SEM、EDS、XPS等方法研究了AlCoCrFeNi2.1共晶高熵合金(EHEA)在0.05 mol/L H2SO4溶液与0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中的腐蚀行为。结果表明，AlCoCrFeNi2.1 EHEA在H2SO4溶液中的钝化行为与局部腐蚀受Cl-影响明显；Cl-不改变AlCoCrFeNi2.1 EHEA钝化膜的半导体类型，但对钝化膜的致密性影响明显；钝化膜中的Ni受Cl-影响较小，Cl-主要通过影响Al、Cr氧化物的含量进而改变钝化膜的性质；在0.05 mol/L H2SO4溶液中，AlCoCrFeNi2.1 EHEA的腐蚀为富Ni-Al相选择性溶解；在0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中，则为点蚀与选择性溶解。
胡文滨 , 张晓雯 , 宋龙飞 , 廖伯凯 , 万闪 , 康磊 , 郭兴蓬 . 共晶高熵合金AlCoCrFeNi2.1 在H2SO4 溶液中的腐蚀行为[J]. 金属学报, 2023 , 59(12) : 1644 -1654 . DOI: 10.11900/0412.1961.2022.00237
Several high-entropy alloys (HEAs), such as single-phase bcc HEA with high strength and fcc with high ductility have been developed over the past few decades. Eutectic HEA (EHEA), such as AlCoCrFeNi2.1, consists of both fcc and bcc microstructure, imparting excellent mechanical properties. The recent research on AlCoCrFeNi2.1 EHEA primarily focuses on its mechanical properties. However, corrosion resistance of AlCoCrFeNi2.1 EHEA is rarely discussed, which is crucial for the application of new materials. This work investigates the corrosion behavior of AlCoCrFeNi2.1 EHEA in 0.05 mol/L H2SO4 and 0.05 mol/L H2SO4 + 0.02 mol/L NaCl solutions using electrochemical evaluation, SEM, EDS, and XPS. The results indicate that Cl- do not alter the semiconductor type of passive film on AlCoCrFeNi2.1 EHEA, but they considerably affect the compactness. Cl- change passive film properties by influencing the Al and Cr oxide contents; however, Ni is not affected by Cl-. The Ni-Al-rich phase is preferentially dissolved in 0.05 mol/L H2SO4 solution, and pitting corrosion and selective dissolution occur in 0.05 mol/L H2SO4 + 0.02 mol/L NaCl solution.
Key words： eutectic high-entropy alloy; localized corrosion; passivation
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