Fe-based alloy coatings were coated on surface of ductile cast iron by high-speed laser cladding, and the effects of chromic acid anodization on corrosion resistance of coatings were analyzed. The results show that as chromic acid anodization time increases, corrosion rate falls and then rises. After 20 min, the coating had Cr and Fe oxide passivation film, maximum impedance value (5.40 x 10(5) Omega center dot cm(2)) and polarization resistance (50.6 k Omega center dot cm(2)), and minimum self-corrosion current (0.77 mu A/cm(2)). Its corrosion resistance had improved significantly.
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