Hot Corrosion Studies of Automotive Exhaust Valves Eaton Corporation, Engine Component Div. Marshall, Ml

Format:

Conference/Event

Author/Creator:

Ari-Gur, Pnina, author.

Conference Name:

International Congress & Exposition (1991-02-25 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1991

Summary:

This study compares the hot corrosion resistance of several internal combustion engine exhaust valve alloys in a simulated diesel engine environment. Hot corrosion of exhaust valves occurs when deposits accumulate on the head and are subjected to temperatures between 650 to 1000°C. Test specimens were subjected to a mixture of CaSO4, BaSO4, Na2SO4, and carbon at 870°C. The materials tested included head material specimens and valves with cobalt based or nickel based seat facings. The depth of corrosion penetration was measured and the valve base materials and seat face coatings were ranked accordingly. The results indicate that nickel based valve alloys have poorer sulfidation resistance than iron based alloys, and nickel based seat facings accelerate the corrosive attack on the base material in the faced region as compared to the unfaced portion of the valve. Valves with cobalt base Tribaloy seat facings exhibited the best resistance, followed by the iron base, Stellite and nickel base respectively

Notes:

Vendor supplied data

Publisher Number:

910633

Access Restriction:

Restricted for use by site license