Effect of Heat Treatment on Anti-fouling Performance and Corrosion Resistance of Ni-P Electroless Plated Coating

The effect of heat treatment temperature on the microstructural evolution of electroless plated Ni-P coatings was investigated using X-ray diffraction(XRD) analysis. The results showed that the as plated electroless Ni-P coating is amorphous. After heat treatment at 350 ℃, Ni-P coatings turn into crystalline state, while Ni3P phase appeared at 400 ℃. With the increasing heat treatment temperature, the Ca2 +atomic percentage of the formed fouling scales reduced firstly at300 ℃, and then increased at 350 and 400 ℃. After heat treatment at 300 ℃, the internal stress and hydrogen embrittleness of the coating was eliminated, thereby, the anti-fouling performance and corrosion resistance of the coating was enhanced.