Corrosion resistance of electrodeposited RE-Ni-W-P-SiC composite coating

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ÎÄÕÂÒ³Â룺413 - 416

Key words£ºcorrosion resistance£» RE-Ni-W-P-SiC composite coating£» electrodeposition

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 FeClª­3 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.