The Corrosion Resistance and Electrocatalytic Activity of Electroplated Ni-W-P Alloy Coating

Ni-W-P alloy coating was prepared using electroplating.The resulting Ni-W-P alloy coating was characterized by means of X-ray diffraction and scanning electron microscopy.Moreover,the electrocatalytic behavior of the Ni-W-P alloy coating was investigated,while its corrosion resistance in hydrochloric acid and sulfuric acid was evaluated.It was found that both the as-deposited coating and the coating heated at 200 ℃ for 0.5 h had amorphous structure.The alloy coating was composed of fine grains and had distinctive crystal boundary,and the grain size slightly increased after heat treatment.Moreover,the heat-treated Ni-W-P alloy had better corrosion resistance than the as-deposited coating,and the electrocalytic activity of the alloy coating could be ranked as Ni-W-P Ni-P Ni-W Ni.