Investigations on Corrosion Behaviour of Cold-Sprayed Titanium on SS316L Steel

Abstract

Cold-Spray (CS) is a coating technique in which micron sized particles are propelled with a carrier gas at supersonic velocity hitting the substrate with high kinetic energy. Consequently, plastic deformation and localised melting at particle substrate interface cause the deposition and coating build up. Unlike other thermal spray techniques, CS does not involve heating particles to a high temperature thus this process helps in developing coatings with low oxide content even for thermally sensitive materials. Corrosion of structures is a big global challenge and CS is a promising technique to develop corrosion resistant coatings with higher deposition rates. In this current work, Titanium coating was developed on SS-316L by a highpressure CS and analysed for its mechanical and corrosion properties. Corrosion resistance of the generated coating was tested in a 3.5% NaCl medium for varying exposure time to understand the corrosion behaviour during long hour exposures.