Synthesis and characterization of aluminum nitride ceramic coating on aluminum alloy by plasma electrolytic oxidation in CO(NH_2)_2 electrolyte

摘要

aluminum nitride ceramic coating were obtained on LY12 aluminum alloy by plasma electrolytic oxidation in CO(NH_2)_2 electrolyte. The microstructure of the ceramic coating including phase and elements composition, surface and cross section morphology were investigated. The properties of the ceramic coatings such as surface roughness, thickness and bonding strength were primarily studied. The results show that the ceramic coating on LY12 aluminum alloy surface was AlN coating with the thickness of 12μm. The AlN ceramic coating showed rough and porous. The average diameter of the pores was 6μm and the surface roughness was 1.5μm. The bonding strength of the coating was 18±2 MPa.