Thermal sprayed coatings for hot corrosion protection of exhaust valves in naval diesel engines

摘要

Fuel used in diesel engines for naval propulsion contains high levels of impurities, principally vanadium and sulfates, that can react to form aggressive compounds, responsible for hot corrosion phenomena, leading to severe degradation of the engines' components, especially exhaust valves. A protective coating is thus required to increase the service life of the valves in the highly corrosive environment.