This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Hot Corrosion Studies of Automotive Exhaust Valves
Annotation ability available
Sector:
Language:
English
Abstract
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.
Recommended Content
| Technical Paper | Aluminum Valve Lifter for Toyota New V-8 Engine |
| Technical Paper | Thermal Spraying of Nano-Crystalline Coatings for Al-Cylinder Bores |
Authors
Topic
Citation
Ari-Gur, P., Noble, V., Narasimhan, S., and Larson, J., "Hot Corrosion Studies of Automotive Exhaust Valves," SAE Technical Paper 910633, 1991, https://doi.org/10.4271/910633.Also In
References
- Caird, S. B. Trela, D. M. “High Temperature Corrosion-Fatigue Test Method for Exhaust Valve Alloys” SAE paper # 810033 1981
- Kocis, J. F. Matlock, W. M. “Alloy Selection for Exhaust Valves” Metal Progress 58 62 August 1975
- Chaudhuri, A. “Hot Corrosion of Diesel Engine Exhaust Valves” SAE paper # 730679 1973
- Clark, G. C “Sulfidation Corrosion of Nickel-Base Exhaust Valves” SAE paper # 750044 1975
- Birks, N. Meier, G.H. F.S. “High-Temperature Corrosion Resistance” Journal of Metals 28 31 December 1987
- Eiselstein H. L. Skinner E. N. “The Effect of Composition on the Scaling of Iron-Chromium-Nickel Alloys Subjected to Cyclic Temperature Conditions.” ASTM-STP 165 162 172 Philadelphia 1954
- Spengler C. J. Viswanathan R. “Effect of Sequential Sulfidation and Oxidation on the Propagation of Sulfur in an 85 Ni-15 Cr Alloy.” Metallurgical Transactions 3 January 1972 161 166
- McGeehan, J. A. Gilmore, J. T. Thompson, R. M. “How Sulfated Ash in Oils Causes Catastrophic Diesel Exhaust Valve Failures” SAE paper # 881584 International Fuels and Lubricants Meeting and Exposition October 10 13 1988
- The International Nickel Company, Inc. “High Chromium, High Nickel Alloys for High Temperature Corrosion Resistance” Casting Engineering 9 18