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 nickelcoated 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