The aluminized 45 and H13 steel were prepared viahot-dipped aluminizing and subsequently high-temperature diffusion treatment.The phase,morphology and composition of aluminized coating were characterized by XRD,SEM and EDS methods.Comparative study was performed on unlubricated sliding wear behavior of plating under different substrates on a pin-on-disc wear tester,and the wear mechanism was explored.The results show that the coating is composed of ductile phases FeAl and Fe_3Al.Kikendall porosity parallel ...