Investigation on Reduction of Porosity and Crack in Plasma Sprayed Alloy Coating by Nanotechnology

Abstract

The corrosion resistance properties of plasma sprayed coating are often affected by pores and cracks. In this study, Fe-Cr nanoparticles alloy coating was prepared via suspension plasma spraying (SPS) under Q235, and FeCr microparticles alloy coating atmospheric plasma was sprayed (APS) under Q235 with the same component. Lots of pores and cracks were observed in micron-coating, few pores and cracks in nano-coating with SEM. nanoparticles there were close combination and uniform arrangement between particles in nano-coating by TEM. Via SECM test in 3.5 % (wt.) NaCl solution for 7 hour, vast and consecutive peaks were occurred in some concentrated area of micron-coating surface, a few peaks appeared in some concentrated area of micron-coating surface.