Investigation of Microstructures and Corrosion Resistance of Two Types of AC-HVAF Sprayed WC Coatings

WC-10Co-4Cr,WC-12Co coatings are prepared using advanced AC-HVAF spray on 0Cr13Ni5Mo stainless steel,the microstructures and corrosion resistance are investigated by XRD,SEM,electrochemistry and salt fog tests.The results show that the phases of the coatings are the same as that of the powers,W2C and W phases are not found,so the AC-HVAF spray technology can control the decomposition of the WC effectively;the coatings are well combined with the 0Cr13Ni5Mo stainless steel and the porosity rates are very low;electrochemistry and salt fog tests show that the corrosion resistance of the WC-10Co-4Cr coatings are better than WC-12Co coatings and 0Cr13Ni5Mo stainless steel;element Cr added in the binder and low porosity rate are the main reasons that the WC-10Co-4Cr coatings have high corrosion resistance.