Effects of Cobalt Content on Mechanical and Corrosion Properties of Electroless Ni-Co-P/TiN Nano-Composite Coatings
Ternary Ni-Co-P/TiN(20 nm)nano-composite coatings with cobalt content in the range of 0~23 wt.% were successfully co-deposited on aluminum alloys by electroless plating.The morphology,composition,microstructure,microhardness,wear behavior and corrosion properties of the deposits were observed using SEM,EDS,XRD,Vickers hardness,ball-on-disc wear tester and electrochemical workstation,respectively.The effect of cobalt content on the tribological and corrosion properties of Ni-Co-P/TiN coatings was investigated.It is found that all the nanocomposite coatings have a compact and rough granular structure with sub-micro globules nonuniformly distributed on the surface.The grain size and the content of Ni and P decrease,but the micro-hardness,adhesion force,friction coefficient and corrosion resistance correspondingly enhance with the increase of cobalt content in Ni-Co-P/TiN coatings.It is revealed that the improved corrosion resistance of Ni-Co-P/TiN nanocomposites is ascribed to the passivation behavior and small grain caused by the introduction of cobalt.Based on the excellent performance on the wear resistance and corrosion resistance,ternary Ni-Co-P/TiN nano-composite coatings with high Co content,such as Ni-Co22.93-P/TiN,may be applied as a wonderful protective coating for Al alloys.
Ni-Co-P/TiN Electroless composite coatings Cobalt content Tribological property Corrosion resistance
Liuting Shi Jia Hua Liang Fang Fang Wu X.L.Liao F.M.Meng
State Key Laboratory of Mechanical Transmission,College of Physics,Chongqing University,Chongqing,40 State Key Laboratory of Mechanical Transmission,College of Physics,Chongqing University,Chongqing,40 Key Laboratory of Biorheological Science and Technology,Ministry of Education,Chongqing University,C
国内会议
重庆
英文
505-516
2016-05-09（万方平台首次上网日期，不代表论文的发表时间）