Substrate Preparation by Laser Texturing for Improved Coating Adhesion on AZ91D Magnesium Alloy

WC-12 Co powder was thermal sprayed on AZ91D Magnesium alloy using HVOF technique. Laser texturing substrate preparation technique was used to roughen the surface for good coating adhesion. Adhesion strength of the coating was determined using ASTM 633C adhesion strength test for thick coatings. were used to investigate coating microstructure. Coating was characterized for porosity, micro hardness and Scanning electron microscopy and X- ray diffraction techniques. The coating hence prepared, were found to achieve good adhesion strength, micro hardness and low porosity.