Structural and electrochemical corrosion properties of plasma-sprayed CoCrFeNiMo HEA coating in corrosive solutions

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Engineering, Science and Technology Pub Date : 2022-09-13 DOI:10.1080/1478422X.2022.2120945

Liu Zhicheng, K. Dejun

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引用次数: 2

Abstract

ABSTRACT A CoCrFeNiMo high-entropy alloy (HEA) coating was prepared on Ti6Al4V alloy by plasma spraying technique. The microstructure and phases of the obtained coating were analysed using an ultra-depth-of-field microscope and X-ray diffraction, respectively. The electrochemical corrosion properties of CoCrFeNiMo HEA coating in 3.5% NaCl, 0.1 M H2SO4 and 0.1 M NaOH solutions were comparatively evaluated using an electrochemical workstation, and the corrosion mechanisms were also discussed by the corrosion models. The results show that the CoCrFeNiMo HEA coating is mainly a solid solution structure of face-centered cubic, which forms mechanical bonding at the coating interface. The charge transfer resistance R ct of 597 × 1016 μA·cm–2 in 0.1 M H2SO4 solution is the highest and the corrosion current density i corr of 4.203 × 10–7 μA·cm–2 also presents the lowest among the three kinds of corrosive solutions, which shows the highest electrochemical corrosion resistance. As a result, the sequence of corrosion resistance is in 0.1 M H2SO4 solution > in 3.5% NaCl solution > in 0.1 M NaOH solution, in which the corrosion resistance is further improved by the passive film on the CoCrFeNiMo HEA coating.

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等离子喷涂CoCrFeNiMo HEA涂层在腐蚀溶液中的结构和电化学腐蚀性能

摘要:采用等离子喷涂技术在Ti6Al4V合金表面制备CoCrFeNiMo高熵合金(HEA)涂层。利用超景深显微镜和x射线衍射分析了涂层的显微组织和物相。利用电化学工作站对比评价了CoCrFeNiMo HEA涂层在3.5% NaCl、0.1 M H2SO4和0.1 M NaOH溶液中的电化学腐蚀性能，并通过腐蚀模型探讨了腐蚀机理。结果表明:CoCrFeNiMo HEA涂层主要为面心立方固溶结构，在涂层界面处形成机械键合;在0.1 M H2SO4溶液中电荷转移电阻rct最高，为597 × 1016 μA·cm-2，腐蚀电流密度rct最低，为4.203 × 10-7 μA·cm-2，具有最高的电化学耐蚀性。结果表明，CoCrFeNiMo HEA涂层的耐蚀性顺序为:在0.1 M H2SO4溶液中>在3.5% NaCl溶液中>在0.1 M NaOH溶液中，其中CoCrFeNiMo HEA涂层的钝化膜进一步提高了其耐蚀性。

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.