Preparation of electroless Ni-P composite coatings containing nano-scattered alumina in presence of polymeric surfactant

The results showed that increasing alumina concentration not only changed the surface morphology, but also promoted the corrosion resistance. Addition of surfactants has an indirect effect on the amount of the incorporated particles. Meanwhile, in the presence of surfactant, corrosion resistance of Ni-P coating containing even a small quantity of alumina was improved since a stabilized bath was obtained.