A ASSESSMENT OF CORROSION RESISTANCE IN Ni-Cr-BASED COATINGS FABRICATED VIA COLD SPRAY TECHNIQUE

Abstract

The Cold Spray deposition method differs from traditional thermal spray techniques in that it operates at lower temperatures, allowing particle deposition without melting the material. This preserves the intrinsic properties of the sprayed particles and minimizes thermal degradation, whereas thermal spray methods involve melting the particles, which can lead to oxidation, residual stresses, and changes in material structure upon solidification. In our study, we examined the corrosion resistance of 4340 steel coated with a Ni/chromium carbide (Ni/CrC) particle blend. Electro-corrosion testing confirmed that the deposited layer has a near-intact condition, with only minimal compound traces found in the electrolyte solution, indicating substantially lower oxidation in the coating than in the base material.