Corrosion resistance of electrodeposited
RE-Ni-W-P-SiC composite coating
RE-Ni-W-P-SiC composite coating
(School of Materials and Metallurgy Engineering，
Kunming University of Science and Technology, Kunming 650093, P.R.China)
Kunming University of Science and Technology, Kunming 650093, P.R.China)
Abstract: Immersion experiment results show that corrosion rate of the as-deposited RE-Ni-W-P-SiC composite coating in HCl solutions increases with the rise of HCl concentration. On the contrary, the corrosion rate of the composite coating after heat treatment decreases with increasing HCl concentration. The corrosion rates of the composite coatings in as-deposited state and after heat treatment in H2SO4 and H3PO4 solutions respectively decrease with the rise of H2SO4 and H3PO4 concentrations. The corrosion rate of the composite coating as-deposited in FeCl3 solutions decreases with increasing FeCl3 concentration, while the rate of the composite coating after heat treatment increases with the rise of FeCl3 concentration. The corrosion rate of 316L stainless steel in the corrosion media of H2SO4 , HCl, H3PO4 and FeCl3 solutions at different concentrations increases with rising concentration. In addition, the corrosion rate of 316L stainless steel in the corrosion media of H2SO4 , HCl, H3PO4 and FeCl3 solutions respectively is much greater than that of the RE-Ni-W-P-SiC composite coating as-deposited and after heat treatment in the same corrosion media.
Key words: corrosion resistance； RE-Ni-W-P-SiC composite coating； electrodeposition