Corrosion of Gasoline Engine Exhaust Valve Steels★

Abstract

Abstract The corrosive environment surrounding the exhaust valves in gasoline engines is considered in connection with the types of corrosion that can occur there. Included in the discussion are valve face, valve head, valve stem and weld junction corrosion. A method of evaluating the corrosion resistance of exhaust valve steels is given. The effect of analysis variation in the chromium-nickel, chromium-nickel-manganese and chromium-nickel-cobalt steels as it influences corrosion is presented. Other matters discussed include the influence of silicon on the corrosion of valve steels, the effect of a variation in nickel-iron content on aircraft valves, and the use of valve rotators in reducing exhaust valve corrosion.