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The Effect of Diesel Soot on Reactivity of Oil Additives and Valve Train Materials
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 1, 1984 by SAE International in United States
Annotation ability available
Diesel soot contaminants may promote valve train wear and scuffing, in passenger car diesel engines, by interfering with the reactivity of oil additives on metal surface.
This is the result of field test and experimental work in a “TNO” tribometer on valve train materials, at various level of reactivity to Zn DTP.
It was found that compatibility between cam and tappet materials depends not only on proper mechanical properties, but on their chemical composition and reactivity to oil additives, provided favorable environmental conditions.
Particularly, high concentration of alloy elements (Ni, Cr) in low carbon steel may result in passivation layers, which inhibit both reactivity to phosphating and Zn DTP.
Besides, the presence of diesel soot contaminants may further reduce metal reactivity to Zn DTP, either through the formation of competitive chemisorption layers with the detergent additives and/or coordination products and micelles with the dispersants and the antiwear additive.
As a result of diesel soot interference, apparently, less antiwear film is formed on the metal surface and severe metal-to-metal contacts and adhesion arise, leading to early engine failure.
CitationCorso, S. and Adamo, R., "The Effect of Diesel Soot on Reactivity of Oil Additives and Valve Train Materials," SAE Technical Paper 841369, 1984, https://doi.org/10.4271/841369.
- Adamo R. and Corso S. “Frictional and Antiwear Behaviour of Fuel Efficient Gear Lubricants - J.L.E.-Nov.82 - ASLE-38/11.
- Rounds F.G. - G.M. - R.& D - SAE 770829 “Carbon: cause of wear?”
- Lorin G.- “Phosphatation des Metaux”- Eyrolles (1973) - 1-129
- Inoue Kiyoshi and Watanab A.- “Interation of Engine Oil Additives”. Preprint ASLE 82-AM-1B-1.
- Watanable H.: “Studies on the Mechanism of Solubilisation Action of Succinimides” - Bull. Japan Petrol, Inst. 13, 2 (1971 - 250-258)
- Schumacher R., Landolt D., Mathieu H.T. and Zinke H. “Surface Reaction Behaviour of Isogemetrical Phosphorus Compounds” Preprint ASLE 82-AM-5A-3.
- Jones R.B., and Loy R.C. “The chemistry of Zn DTP Additivies” ASLE Trans. 24 (1981) 91-97 - Scott D. - Ministry of Technology - National Laboratory.
- “Metallurgical Aspects of Materials for Tribological Application”. Joint Convention on Tribology, August 1968 (UK)
- Smalley R.J. and Gariglio R.. “Carbonitriding of engine tappets” SKF R&D Laboratory - Nieuwegein (The Netherlands).
- Ohkatsu S., “Antioxidative Mechanism of Zn DTP” - J. ASLE 23, 8 (1978) 606-613.
- Moore D.F., “Principles and application of Tribology” Pergamon Press. Oxford, New York (1975) 1-135.
- Georges J.M. “Microscopic Aspects of adhesion and Lubrucation” Elsevier, New York 1982.
- “The Role of Oxide Films in the Friction and Wear Behaviour of Metals” by; Quin T.F.J.. Tribology series, 7 - Georges J.M. (Editor) - Elsevier N.Y. 1982.