Abrasive Properties of TD-Cr/PVD-CrN Composite Coatings on 45 Steel Surfaces

被引：0
|
作者：
Luo Y. [1 ]
Wan Q. [1 ]
Cao D.-C. [1 ]
Yang Z.-H. [1 ]
Li S.-J. [1 ]
Meng L. [1 ]
Xiao Y.-Y. [1 ]
Han M.-X. [1 ]
机构：
[1] College of Engineering, Huazhong Agricultural University, Wuhan
来源：
Surface Technology | 2023年 / 52卷 / 07期
基金：
中国国家自然科学基金;
关键词：
45; steel; corrosion resistance; friction and wear; mechanical properties; TD-Cr/PVD-CrN coating;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.07.042
中图分类号：
学科分类号：
摘要：
Thermal diffusion (TD) and vapor physical deposition (PVD) are effective means to strengthen metal surface. The surface hardness of metal can be improved by thermal diffusion (TD) chromizing, but the surface roughness of chromizing layer leads to the phenomenon that the wear rate is too high in the friction process, and the existence of metal elements in thermal diffusion chromizing treatment is not conducive to the surface corrosion resistance. The metal nitride coating prepared by vapor phase physical deposition (PVD) has the characteristics of high hardness, wear resistance and corrosion resistance, which is suitable to be combined with TD chromizing metal layer to form a low friction, wear resistance and corrosion resistance surface. Among them, CrN coating has stable friction coefficient, high wear and corrosion resistance, and is often used as a surface strengthening coating for easily worn parts. In this study, thermal diffusion (TD) metallization technology and physical vapor deposition (PVD) technology were used to strengthen the surface of 45 steel, so as to improve the surface hardness and abrasion resistance of 45 steel and prolong the service life of 45 steel. Firstly, the 45 steel substrate was chromized in a vacuum metallizing furnace. The chromizing process was to preheat at 500 ℃ for 1 h, and heat to 960 ℃ for 15 h, then cool to 200 ℃ with the furnace, and cool to room temperature. Then, the CrN coating was deposited on 45 steel and TD-Cr coatings by vacuum multi arc ion plating technology, PVD-CrN coating and TD-Cr/PVD-CrN composite coating were prepared. The current and voltage in the deposition process were 160 A and 20 V, the N2 content ratio was 40%, the negative bias voltage was 70 V, the deposition temperature was 300 ℃, and the deposition time was 1 h. The microstructure, elements and phase composition of the coating were studied by scanning electron microscope (SEM) and X-ray diffraction (XRD). The hardness and Young's modulus of the coating were studied by nanoindentation. The tribological and corrosion properties of the coating were studied by friction wear tests and electrochemical corrosion tests. The results showed that the structures of TD-Cr, PVD-CrN, TD-Cr/PVD-CrN coatings were uniform and compact, and their thickness was 19.78 μm, 1.075 μm, 32.24 μm, respectively. The hardness of TD-Cr/PVD-CrN composite coating reached 28.7 GPa, which was higher than that of other coatings. Meanwhile, the Modulus and We of TD-Cr/PVD-CrN coating were better than those of other coatings. The friction coefficients of TD-Cr, PVD-CrN, TD-Cr/PVD-CrN were 0.52, 0.38 and 0.35 in salt water environment friction, respectively, and the wear volume were 26, 0.15 and 0.05, respectively. The TD-Cr/PVD-CrN had a good wear resistance. The corrosion resistance of TD-Cr/PVD-CrN was slightly lower than that of CrN coatings in the salt water environment. As the transition layer, the Cr coating provides a good base film bonding performance, alleviates the stress mismatch problem caused by the excessive hardness difference between 45 steel substrate and CrN coating, so as to give full play to the good mechanical properties of the CrN coating. The CrN coating is combined with the Cr coating to improve the mechanical properties of the coating and reduce the friction coefficient. Overall, TD-Cr/PVD-CrN coating can effectively improve the abrasion resistance of 45 steel and prolong its service life. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：455 / 463
页数：8
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