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《Surface Technology》 2017-10
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Tribological Behavior of Cold Sprayed Cu402F Coating after Laser Remelting

CHEN Zheng-han;SUN Xiao-feng;LI Zhan-ming;SHI Yu-peng;LIU Xiao-tong;Armored Force Engineering College;  
The work aims to study tribological behavior of cold sprayed Cu402F coating in corrosive medium after laser remelting.Laser remelting technology was applied to modify properties of a nearly 882.11 μm thick cold sprayed Cu402F coating,which was prepared on nickel-aluminum bronze by adopting cold spraying technology.Microstructure of coating section and surface was observed by using OM and SEM; structure,surface residual stress,tribological properties and corrosion behavior of the coating were mainly studied by using XRD,X-ray residual stress tester,multi-function surface property tester and multi-frequency linear reciprocating abrasion tester.Laser remelted coating was divided into surface remelted layer,porous remelted transition layer and cold spray inherited layer.Phases and residual stress of the coating did not change greatly after laser remelting.Average friction coefficient of the laser remelted coating increased progressively under the load of 20,50 and 100 N,the wear rate was 1.01×10~(-2),1.17×10~(-2) and 1.34×10~(-2) mm~3/(N·m),respectively.The abrasion test indicated that generation and breaking of passive film on surface of the coating appeared alternately,reflecting synergistic effect of wear and corrosion.OCP(open circuit potential) was positively correlated with friction coefficient,indicating that the generation of passive film was faster than destruction.Laser remelting reserve the advantages of cold spayed Cu402F coating.Meanwhile,quicker generation of passive film on laser remelted coating contributes to abrasion resistance improvement of coating.
【Fund】: 军内科研基金~~
【CateGory Index】: TG174.442
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