Microstructure and corrosion performance of AlCoCrFeNi2.1 high-entropy alloy coating on AZ31B magnesium alloy via friction stir processing

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-05-17 DOI:10.1016/j.apsusc.2025.163566

Yu Ni, Hui Xu, Jiaxu Pan, Rui Zhang, Pengxian Zhang, Changqing Zhang, Yuhua Jin, Zhongke Zhang

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Abstract

In this study, a high-entropy alloy (HEA) coating of AlCoCrFeNi_2.1 was prepared on AZ31B magnesium alloy surface by friction stir processing (FSP), which enhanced the magnesium alloy’s corrosion resistance significantly. The work focused on studying the microstructural evolution near the interface between the substrate and the coating, as well as evaluating the coatings’ corrosion resistance. The consequences showed that the coating structure is dense and uniform, with good interfacial bonding and no defects. The microstructure on both sides of the interface has undergone significant refinement, which is caused by severe plastic deformation of the coating during processing. Compared to AZ31B magnesium alloy, the corrosion potential (E_corr) of coating was increased to −0.332 V, and the corrosion current density (I_corr) of coating was reduced by three orders of magnitude. In 3.5 wt% NaCl solution, the coating forms a protective passive film predominantly composed of metal oxides and metal hydroxides, with some pitting corrosion spots observed on its surface.

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搅拌摩擦处理AZ31B镁合金表面AlCoCrFeNi2.1高熵合金涂层的组织与腐蚀性能

本研究通过搅拌摩擦处理（FSP）在AZ31B镁合金表面制备了高熵合金（HEA）涂层AlCoCrFeNi2.1，显著提高了镁合金的耐蚀性。重点研究了涂层与基体界面附近的微观组织演变，并对涂层的耐蚀性进行了评价。结果表明：涂层结构致密均匀，界面结合良好，无缺陷。界面两侧的微观组织发生了明显的细化，这是由于涂层在加工过程中发生了严重的塑性变形造成的。与AZ31B镁合金相比，涂层的腐蚀电位（Ecorr）提高到−0.332 V，腐蚀电流密度（Icorr）降低了3个数量级。在3.5 wt% NaCl溶液中，涂层形成以金属氧化物和金属氢氧化物为主的钝化保护膜，表面出现点蚀点。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.