Influences of Mechanical, Corrosion, erosion and tribological performance of cold sprayed Coatings A review

Abstract

Surface modification is done through various surface modification methods like atmospheric plasma spray (APS), flame spraying, chemical vapour deposition, physical vapour deposition, electroplating process and most widely used technique is High Velocity Oxy Fuel (HVOF). In that technique, powder in the hopper is melted by burning fossil fuel in the combustion chamber. This will develop coatings with high residual stress, crack propagation, oxidation of materials, and phase transition, it can affect mechanical, tribological, erosion and corrosion behavior of coating. Although during the burning of fossil fuels such as (LPG, acetylene and kerosene) with oxygen in the combustion chamber a large amount of energy is consumed, and also many harmful gases (like carbon monoxide (CO), carbon dioxide (CO2) is formed, which is very hazardous to the environment. To come out from this issue an eco-friendly technology cold spray coating process (CS) is the greater replacement for HVOF process. CS coating is formed using solid state impingement of feed stock powder to the substrate with supersonic velocity generated by de Laval nozzle. Cold spray coatings possess the improvement of tribological, mechanical, erosion and corrosion properties in contrast to HVOF. A study has been made to analyze the findings of mechanical, tribological, erosion and electrochemical characteristics of cold spray coating. The cold spray process assists to bring harmony between the environment and industries.