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

Abstract

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 ± 11 Hv up to 614 ± 17 Hv. 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 0.5 M H₂SO₄.

Keywords:

• Composite
• Corrosion
• Deposition
• Electroless
• Hydrogen
• Microhardness
• Ni–P–TiO₂
• Roughness
• Sol
• Surfactants
• TiO₂