One-step fabrication of wear resistant and friction-reducing Al2O3/MoS2 nanocomposite coatings on 2A50 aluminum alloy by plasma electrolytic oxidation with MoS2 nanoparticle additive

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2025-02-01 Epub Date: 2025-01-13 DOI:10.1016/j.surfcoat.2025.131796

Min Zhang , Xining Ma , Siyang Zhang , Liyan Hou , Kwang Ho Kim

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Abstract

Wear resistant and friction-reducing Al₂O₃/MoS₂ nanocomposite coatings were fabricated in-situ on 2A50 aluminum alloy substrate using one-step plasma electrolytic oxidation in silicate electrolyte solution with MoS₂ nanoparticle addition. The effect of MoS₂ incorporation on microstructure and wear resistance of the obtained ceramic coatings was investigated by regulating the concentration of MoS₂ nanoparticle. Phase structure, microstructure, composition and wear resistance of the ceramic coatings were characterized by XRD, SEM, EDS, profilometer and ball-on-disc friction and wear tester. The results show that the anodic voltage of micro-arc discharge stage increased with the increasing of MoS₂ concentration and the prepared ceramic coatings were mainly composed of α-Al₂O₃, γ-Al₂O₃, MoS₂, and mullite phases. The EDS mapping results show Mo and S elements were evenly distributed in the ceramic coatings indicating the formation of Al₂O₃/MoS₂ nanocomposite coatings. Friction performance evaluation shows that the ceramic coatings obtained at the MoS₂ nanoparticle concentration of 4 g/L exhibit the best wear resistance and antifriction property. During the friction and wear test, the protective lubricant film formed between ceramic layer and grinding parts is the largest and the average friction coefficient is the lowest, as low as 0.1. The wear rate was the lowest (about 5.28 × 10⁻⁴ cm³·N⁻¹·m⁻¹). It can be concluded that MoS₂ can play a good antifriction and lubrication effect in ceramic layer, optimize the microstructure of ceramic layer, and improve the wear resistance of ceramic layer.

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用二硫化钼纳米颗粒添加剂一步法制备2A50铝合金表面的Al2O3/MoS2纳米复合涂层

在硅酸电解质溶液中，采用一步等离子体电解氧化的方法，在2A50铝合金基体上原位制备了Al2O3/MoS2耐磨减摩纳米复合涂层。通过调节纳米二硫化钼颗粒的浓度，研究了二硫化钼掺入对陶瓷涂层微观结构和耐磨性的影响。采用XRD、SEM、EDS、轮廓仪和球盘式摩擦磨损试验机对陶瓷涂层的相结构、显微组织、成分和耐磨性进行了表征。结果表明：微弧放电阶段阳极电压随MoS2浓度的增加而升高，制备的陶瓷涂层主要由α-Al2O3、γ-Al2O3、MoS2和莫来石相组成；能谱分析结果表明，Mo和S元素均匀分布在陶瓷涂层中，形成了Al2O3/MoS2纳米复合涂层。摩擦性能评价表明，MoS2纳米颗粒浓度为4 g/L时获得的陶瓷涂层具有最佳的耐磨性和减摩性能。在摩擦磨损试验中，陶瓷层与磨削部件之间形成的保护润滑膜最大，平均摩擦系数最低，低至0.1。磨损率最低，约为5.28 × 10−4 cm3·N−1·m−1。结果表明，MoS2可以在陶瓷层中发挥良好的减摩润滑作用，优化陶瓷层的微观结构，提高陶瓷层的耐磨性。

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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.