Abstract
Cr–P is a new material of great importance as a decorative coating with nickel in automobile industries. Electroless plating of Cr–P alloy has been carried out using a suitable plating bath solution and working conditions. The deposit is characterized by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray diffraction, X-ray photoelectron spectroscopy and polarization techniques. New phases appear on heat treatment of the coating. The composition (Cr/P) of the coating and the oxidation states of alloying elements vary from the surface to the bulk of the material. The coatings acted as a novel electrode material with good electrocatalytic activity (low overvoltage) and good corrosion resistance for anodic oxidation of methanol in H2SO4 at normal working temperature. The good corrosion resistance of the Cr–P film is accounted for by the existence of a double oxyhydroxide passive film on the surface. The electrocatalytic activity of Cr–P is very high when compared with chromium alone.
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