Enhanced wear resistance, corrosion behavior, and thermal management in magnesium alloys with PEO coatings

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131438

Ruonan Ji , Shuqi Wang , Xinrui Zhao , Yongchun Zou , Tianyi Zhang , Xin Qian , Guoliang Chen , Yaming Wang , Jiahu Ouyang , Dechang Jia , Yu Zhou

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引用次数: 0

Abstract

The harsh conditions encountered in aerospace applications, such as high operational temperatures, abrasive wear, and corrosive substances, present significant challenges to the performance and longevity of magnesium alloy components. To create a coating with superior wear resistance, corrosion resistance, and high emissivity, this study employs plasma electrolytic oxidation (PEO) technology to develop a nanocomposite coating doped with carbon nanotubes (CNTs) and hexagonal boron nitride (h-BN). The results demonstrate that the MgO-BN/CNTs coating with an emissivity of 0.82 reduces the equilibrium temperature of the 5 W LED junction by nearly 10 °C compared to the magnesium alloy substrate, showing improved radiative heat dissipation performance. Due to the ability of the porous structure to accommodate abrasive particles, coupled with the lubricating effect of h-BN and CNTs, the friction coefficient of the MgO-BN/CNTs coating is 0.57, which is 21 % lower than that of the MgO coating. Additionally, the coating exhibits excellent corrosion protection, attributed to the dense microstructure and chemical inertness of h-BN. The findings demonstrate that the strategic incorporation of h-BN and CNTs into PEO coatings effectively improves the wear resistance, corrosion resistance, and thermal management performance of magnesium alloys.

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使用 PEO 涂层提高镁合金的耐磨性、腐蚀性和热管理性能

航空航天应用中遇到的苛刻条件，如高工作温度、磨料磨损和腐蚀性物质，对镁合金部件的性能和使用寿命提出了重大挑战。为了制造具有优异耐磨性、耐腐蚀性和高发射率的涂层，本研究采用等离子电解氧化（PEO）技术开发了一种掺杂碳纳米管（CNT）和六方氮化硼（h-BN）的纳米复合涂层。结果表明，与镁合金基底相比，发射率为 0.82 的 MgO-BN/CNTs 涂层可将 5 W LED 结的平衡温度降低近 10 °C，显示出辐射散热性能的改善。由于多孔结构能够容纳研磨颗粒，再加上 h-BN 和 CNTs 的润滑作用，MgO-BN/CNTs 涂层的摩擦系数为 0.57，比 MgO 涂层低 21%。此外，由于 h-BN 的致密微观结构和化学惰性，涂层还具有优异的防腐蚀性能。研究结果表明，在 PEO 涂层中策略性地加入 h-BN 和 CNT 可有效改善镁合金的耐磨性、耐腐蚀性和热管理性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.