Wear behavior of electron beam remelting modified Ni/WC thermal spray coatings

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

Surface & Coatings Technology Pub Date : 2024-09-10 DOI:10.1016/j.surfcoat.2024.131336

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引用次数: 0

Abstract

Ni/WC composite coatings were prepared by combining thermal spraying and electron beam remelting. Characterization methods such as SEM, EBSD and XRD were used. The effect of electron beam remelting beam current on the corrosion and wear resistance of Ni/WC composite coatings was investigated. The microstructure showed that hard carbides and borides such as W₂C, Cr₂₃C₆, and M₃B were generated within the remelted coating. Compared to the thermal spray specimens, the hardness of the 16 mA specimen was increased by a factor of 1.47, and the hardness of the 22 mA specimen was also increased by a factor of 1.14. The results of the corrosion experiments showed that the 16 mA specimen had the lowest corrosion current density and the highest corrosion potential, which showed the best corrosion resistance. Wear experiments were carried out by using SiC balls as the counterbodies. The results showed that the wear resistance of both 16 mA and 22 mA specimens under dry friction with 3.5 % NaCl solution conditions was improved compared to the thermal spray coating. The 22 mA specimens showed more obvious subsurface damage. The wear mechanism of thermal spray coatings is mainly abrasive, and the wear mechanism of remelted coatings is mainly abrasive and adhesive.

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电子束重熔改性 Ni/WC 热喷涂涂层的磨损特性

通过热喷涂和电子束重熔相结合的方法制备了 Ni/WC 复合涂层。使用了 SEM、EBSD 和 XRD 等表征方法。研究了电子束重熔束流对 Ni/WC 复合涂层耐腐蚀性和耐磨性的影响。显微结构显示，重熔涂层中产生了硬碳化物和硼化物，如 W2C、Cr23C6 和 M3B。与热喷涂试样相比，16 mA 试样的硬度提高了 1.47 倍，22 mA 试样的硬度也提高了 1.14 倍。腐蚀实验结果表明，16 毫安试样的腐蚀电流密度最低，腐蚀电位最高，耐腐蚀性能最好。以碳化硅球为反面进行了磨损实验。结果表明，与热喷涂涂层相比，16 mA 和 22 mA 试样在 3.5% NaCl 溶液干摩擦条件下的耐磨性都有所提高。22 mA 试样的表面下损伤更为明显。热喷涂涂层的磨损机理主要是磨蚀，而重熔涂层的磨损机理主要是磨蚀和粘附。

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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.