共晶高熵合金AlCoCrFeNi2.1 在H2SO4 溶液中的腐蚀行为

doi:10.11900/0412.1961.2022.00237

金属学报

2023, Vol. 59

Issue (12): 1644-1654 DOI: 10.11900/0412.1961.2022.00237

本期目录 | 过刊浏览

共晶高熵合金AlCoCrFeNi_2.1 在H₂SO₄ 溶液中的腐蚀行为

胡文滨, 张晓雯, 宋龙飞(

), 廖伯凯, 万闪, 康磊, 郭兴蓬(

)

广州大学化学化工学院广州 510006

Corrosion Behavior of AlCoCrFeNi_2.1 Eutectic High-Entropy Alloy in Sulfuric Acid Solution

HU Wenbin, ZHANG Xiaowen, SONG Longfei(

), LIAO Bokai, WAN Shan, KANG Lei, GUO Xingpeng(

)

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

引用本文:

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AlCoCrFeNi_2.1 在H₂SO₄ 溶液中的腐蚀行为[J]. 金属学报, 2023, 59(12): 1644-1654.
Wenbin HU, Xiaowen ZHANG, Longfei SONG, Bokai LIAO, Shan WAN, Lei KANG, Xingpeng GUO. Corrosion Behavior of AlCoCrFeNi_2.1 Eutectic High-Entropy Alloy in Sulfuric Acid Solution[J]. Acta Metall Sin, 2023, 59(12): 1644-1654.

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摘要:

利用电化学测试、SEM、EDS、XPS等方法研究了AlCoCrFeNi_2.1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，AlCoCrFeNi_2.1 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AlCoCrFeNi_2.1 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，AlCoCrFeNi_2.1 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。

关键词 ：共晶高熵合金, 局部腐蚀, 钝化

Abstract：

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 AlCoCrFeNi_2.1, consists of both fcc and bcc microstructure, imparting excellent mechanical properties. The recent research on AlCoCrFeNi_2.1 EHEA primarily focuses on its mechanical properties. However, corrosion resistance of AlCoCrFeNi_2.1 EHEA is rarely discussed, which is crucial for the application of new materials. This work investigates the corrosion behavior of AlCoCrFeNi_2.1 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 AlCoCrFeNi_2.1 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

收稿日期: 2022-05-12

ZTFLH:

TG178

基金资助:广东省区域联合基金-青年基金项目(2021A1515110560)

通讯作者: 宋龙飞，songlongfei@gzhu.edu.cn，主要从事金属腐蚀与防护研究;
郭兴蓬，guoxingpeng@gzhu.edu.cn，主要从事金属腐蚀与防护研究

作者简介: 胡文滨，男，1999年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00237 或 https://www.ams.org.cn/CN/Y2023/V59/I12/1644

图1 AlCoCrFeNi2.1共晶高熵合金(EHEA)显微组织

图2 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中的循环极化曲线

表1 AlCoCrFeNi2.1 EHEA的电化学参数

图3 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中的EIS

表2 AlCoCrFeNi2.1 EHEA的EIS拟合参数

图4 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中的恒电位极化曲线

图5 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中的M-S曲线

表3 AlCoCrFeNi2.1 EHEA以不同电位恒电位极化2 h后的受主密度和施主密度

图6 AlCoCrFeNi2.1 EHEA浸泡在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液25 d后的SEM像

图7 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中浸泡25 d的EDS元素面分布

图8 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中恒电位0.2 V (vs SCE)极化2 h后的高分辨XPS图

图9 AlCoCrFeNi2.1 EHEA在0.05 mol/L H2SO4溶液和0.05 mol/L H2SO4 + 0.02 mol/L NaCl溶液中的局部腐蚀机理示意图

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