Abstract:This work aims to investigate the effects of sandblasting parameters on the surface roughness, matrix shape deformation and bonding strength of both inorganic and organic coatings on the Al-alloy thin wall parts. 24-mesh and 60-mesh brown corundum sands were used for sandblasting on the surface of 2 mm thick 6061 Al-alloy thin wall plates. The sandblasting pressures were 0.3~0.5 MPa, respectively. The repeated sandblasting time varies between 1~15. The changes of thickness, quality and surface roughness before and after sandblasting were tested, and the surface morphology after sandblasting was observed by scanning electron microscope and 3D optical microscope. YSZ thermal barrier coating and acrylic polyurethane organic coating were separately prepared on the surface of Al-alloy with different sandblasting times. The bonding strengths of the coatings were tested by tensile method and cross cutting method. Results showed that after once sandblasting, the surface roughness (Ra) of Alalloy surface significantly increased from 0.35 μm to 4.747 ~ 11.49 μm. The thickness also increased slightly, and the quality change was not obvious. 24-mesh sandblasting will cause obvious deformation of the substrate. The quality and thickness of Al-alloy thin wall plates decreaseed linearly with the sandblasting times. With the increase of sand particle size and sandblasting pressure, the reducing rate of quality and thickness increased. The bonding