| In this paper, Ni/Al intermetallic coating in-situ synthesized on stainless steel substrate by laser cladding. Discussed the influence of laser processing parameters on the coating quality to optimize the laser process parameters. Analysed the phase composition and the microstructure of cladding. Tested the conditions and properties of friction and wear on the cladding in different temperature with abrasion tester. In the end, studied corrosion resistance of the coating in electrochemical workstation.The experiment result showed that laser cladding parameters have great impact on the microstructure, macro-configuration and the capability of the cladding layers. the Ni/Al intermetallic coating on the stainless steel substrate could be prepared through optimizing the laser processing parameters. We obtained cladding coatings with good surface quality, fine microstructure, low dilution, high micro-hardness and good metallurgical combination interface with stainless steel.Tribological wear experiments result showed that the best condition of friction for Ni/Al intermetallic compound coating is under load of 5 N, sliding speed of 0.21 m/s. At different temperatures, Ni/Al intermetallic compound coating all had better properties of friction and wear. In the whole process of friction, friction coefficient was good stability and very low. And wear rate was also relatively less. From 25℃to 700℃, the tribological properties of coating changed regularly. The best properties of friction and wear were presented at 500℃.It was shown by polarization cure that Ni/Al intermetallic compound coating has better anticorrosion properties. The coating showed different anticorrosion properties and corrosion mechanisms in 3.5% NaCl solution, 1 mol/L NaOH solution and 1 mol/L HCl solution.
|
PDF Full Text Request