High-Pressure Cold-Sprayed Ni and Ni-Cu Coatings - Improved Structures and Corrosion Properties

This study examines the structural and corrosion properties of Ni and NiCu coatings produced by high-pressure cold spraying. It also assesses the effect of heat treatment. FE-SEM images of coating cross-sections show tightly bonded particles with only a minor presence of open or oxidized boundaries. Polarization measurements in alkaline salt and acid solutions show that the Ni and NiCu coatings have good potential for corrosion protection applications. Corrosion behaviors of as-sprayed and heat treated coatings are compared with corresponding properties of bulk and substrate materials.