Erosion wear property of surface diffusion alloyed coatings on magnesium alloy

Erosion wear tests under different erosion slurry mediums were carried out to investigate erosion properties of the treated samples of ZM5 magnesium alloy by surface diffusion alloying processing (SDAP). The result indicated that the micro-hardness (HV172) near the surface of alloyed specimen was about twice more than that of its substrate(HV82) after treated at 390 degrees C for 8h. The erosion wear resistance beta(0.68 x 10(4) mm(2)/g) of the treated specimen was better than that of untreated specimen (0.48 x 104 mm(2)/g,) under the conditions of erosion slurry of oil and quartz. The difference of erosion wear resistance between them was primary due to cutting wear mechanism. While erosion mediums was changed to the slurry of water and quartz, the wear resistance 13 of the treated specimen increase up to 0.24 x 10(4) (mm(2)/g) and that of the untreated specimen was only 0.09 x 10(4) (mm(2)/g),the difference between them resulted from corrosion wear mechanism predominating, which worsen the erosion wear resistance beta.