Microstructure,Wear and Corrosion Resistance Properties of Nickel-Coated WC Enhanced Iron-Based Alloy Coatings on Surface of Cr30 steel
In order to improve the erosion and wear resistance of Cr30 steel surface and its corrosion resistance to sulfuric acid and hydrochloric acid,a nickel-coated WC iron-based alloy coating was prepared on the surface of Cr30 steel by laser cladding technology with using a mixture of ferroalloy powder and nickel-coated WC particles as raw materials.The effects of the mass fraction of nickel-coated WC(10％～30％) in the raw material on the microstructure,phase composition,microhardness,erosion and wear resistance,and sulfuric acid and hydrochloric acid corrosion resistance of the iron-based alloy coating were studied.Results showed that the phases of the iron-based alloy coating without nickel-coated WC were FeCr solid solution and Cr23C6,while the phases of the iron-based alloy coating containing 10％ and 20％ nickel-coated WC were FeCr solid solution,Cr23C6 and Fe3W3C.As the content of nickel-coated WC increased to 30％,new carbides Fe6W6C were precipitated in the iron-based alloy coating,and the phases of the iron-based alloy coating containing 30％ nickel-coated WC were FeCr solid solution,Cr23C6,Fe3W3C and Fe6W6C.Meanwhile,with the increase of the content of nickel coated WC,the microhardness,erosion wear resistance and sulfuric acid and hydrochloric acid corrosion resistance of iron-based alloy coating were improved.When the mass fraction of nickel coated WC was 30％,the microstructure of the iron-based alloy coating was dense and the refinement effect was most obvious,and the hardness of the coating was the highest,reaching 786 HV0.5 .In general,the iron-based alloy coating with 30％ nickel-clad WC possessed the best resistance to erosion wear,sulfuric acid and hydrochloric acid corrosion.
laser claddingnickel coated WCiron-based alloy coatingerosion wearcorrosion in acidic media
NETL
NSTL
万方数据
