Obtaining of Ni-P-TiO2 Composite Coatings with TiO2 Sol and Surfactants and Their Properties

摘要

The influence of surfactants and TiO2 sol on mechanical, catalytic, and corrosive properties of electroless Ni-P coatings was investigated. Additives of the surfactants caused the decrease of internal stresses in the Ni-P coatings and smoothing of their surfaces. Incorporation of the TiO2 particles facilitated the rise of microhardness of the Ni-P coatings from 545 +/- 11Hv up to 614 +/- 17Hv. Additives of the surfactants accelerated hydrogen evolution reaction on the composite Ni-P-TiO2 coatings in acid and alkaline media, and increased photocatalytic activity in methylene blue decomposition. Incorporation of the TiO2 particles and application of the surfactants resulted in an improvement in the corrosion resistance of original Ni-P coatings in 0.5M H2SO4.