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Microstructure and Mechanical Properties of Zn-Ni-Al2O3 Composite Coatings

1
College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao 266580, China
2
Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Materials Research Institute, Qingdao 266237, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2018, 11(5), 853; https://doi.org/10.3390/ma11050853
Received: 26 March 2018 / Revised: 17 May 2018 / Accepted: 17 May 2018 / Published: 21 May 2018
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Abstract

Zn-Ni-Al2O3 composite coatings with different Ni contents were fabricated by low-pressure cold spray (LPCS) technology. The effects of the Ni content on the microstructural and mechanical properties of the coatings were investigated. According to X-ray diffraction patterns, the composite coatings were primarily composed of metallic-phase Zn and Ni and ceramic-phase Al2O3. The energy-dispersive spectroscopy results show that the Al2O3 content of the composite coatings gradually decreased with increasing of Ni content. The cross-sectional morphology revealed thick, dense coatings with a wave-like stacking structure. The process of depositing Zn and Ni particles and Al2O3 particles by the LPCS method was examined, and the deposition mechanism was demonstrated to be mechanical interlocking. The bond strength, micro hardness and friction coefficient of the coatings did not obviously change when the Ni content varied. The presence of Al2O3 and Ni increased the wear resistance of the composite coatings, which was higher than that of pure Zn coatings, and the wear mechanism was abrasive and adhesive wear. View Full-Text
Keywords: low-pressure cold spray; Zn-Ni composite coating; microstructure; wear resistance low-pressure cold spray; Zn-Ni composite coating; microstructure; wear resistance
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Bai, Y.; Wang, Z.; Li, X.; Huang, G.; Li, C.; Li, Y. Microstructure and Mechanical Properties of Zn-Ni-Al2O3 Composite Coatings. Materials 2018, 11, 853.

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