Title: Tribological properties of laser surface cladding Ni-base alloy coatings under dry friction and seawater conditions

Authors: Ye-Fa Tan; Long He; Xiao-Long Wang; Hua Tan; Chun-Hua Zhou

Addresses: College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China ' College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China ' College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China ' College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China ' College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China

Abstract: Ni-base alloy coatings were prepared on aluminium alloy 7005 by laser surface cladding (LSC). The tribological properties of the coatings under dry friction and seawater conditions were investigated. Results showed that the coatings contained the phases of NiAl, NiAl₃, Al₃Ni₂ and a few Cr₂₃C₆ and CrB. Compared with atmosphere plasma spraying (APS) Ni-base alloy coatings, LSC Ni-base alloy coatings exhibited higher microhardness, interfacial adhesion and cohesion force, and smaller friction coefficients and wear losses. The wear mechanisms of LSC Ni-base alloy coatings changed from micro-cutting wear into multi-plastic deformation wear, adhesive wear and oxidative wear as loads increased in dry friction. In seawater environment, LSC Ni-base coatings experienced micro-cutting wear and pitting corrosion wear at the loads of 3∼6 N, and multi-plastic deformation wear and local fracture wear at the loads higher than 9 N.

Keywords: laser surface cladding; LSC; nickel; sliding wear; corrosion wear; surface analysis; tribological properties; tribology; alloy coatings; dry friction; seawater; aluminium alloys; microhardness; interfacial adhesion; cohesion force; friction coefficient; micro-cutting wear; multi-plastic deformation; adhesive wear; oxidative wear; pitting corrosion; fracture.

DOI: 10.1504/IJSURFSE.2016.076512

International Journal of Surface Science and Engineering, 2016 Vol.10 No.2, pp.147 - 161

Received: 05 Mar 2014
Accepted: 17 Dec 2014
Published online: 11 May 2016 *

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