Influence of Heat Treatment Temperature on Corrosion Resistance of Ni-W-P Coating

The anti-corrosion performance of as-plated and heat-treated Ni-W-P coatings was studied by immersion corrosion and electrochemical tests in 5% H2SO4 solution. The heat-treated Ni-W-P coatings had better corrosion resistance than the heat-treated Ni-P coatings. The treated Ni-P coatings had worse anticorrosion performance than the untreated coating, while the corrosion resistance of treated Ni-W-P coatings was better than the as-plated coating. And the corrosion resistance performance of Ni-W-P was greatly improved with the increase heat-treated temperature.