Performance Comparison of High-speed Laser Cladding Martensitic Stainless-steel Coatings and Electroplating Coatings
In order to compare the feasibility of high-speed laser cladding coatings replacing elec-troplated hard chrome coatings under different service conditions of hydraulic cylinders,martensite stainless steel cladding layers XG-1,XG-2 and electroplated hard chrome coatings were prepared re-spectively.The microstructure,hardness,corrosion performance and wear performance under simula-ted different conditions(scratch wear,dry sand grinding wear,sliding friction wear)of the three coat-ings were tested,and the coating failure behavior and application conditions were discussed.The re-sults show that the microstructures of XG-1 and XG-2 coatings are dense and uniform,with an aver-age microhardness of 720.5 HV and 653 HV,respectively.The electroplated hard chrome coatings contain defects such as pores and cracks,and the self-corrosion current density is about 10.45μA/cm2,indicating the worst corrosion resistance.Under the three wear modes,the electroplated hard chrome coatings have cracked and peeled off,while the high-speed laser cladding coatings exhibit better wear resistance,which are suitable for the service conditions of hydraulic cylinders such as pis-ton rod easily to be scratched,surrounding environment being rich in hard particle pollutants,and large lateral loads.
国家科技期刊平台
NSTL
万方数据
