INHIBITION OF OXIDATION BY ZDTP AND ASHLESS ANTIOXIDANTS IN THE PRESENCE OF HYDROPEROXIDES AT 160 DEGREES C--PART I

A reaction scheme depicting engine oil oxidation chemistry occurring in internal combustion engines is proposed. This scheme reflects the idea that hydroperoxides, which are initial oxidation products, are formed continuously in engine oil, regardless of the presence of radical trapping inhibitors, due to a continuous influx of free radicals from the combustion process. Therefore, the antioxidant behavior of a zinc dialkyldithiophosphate (ZDTP) itself and in combination with an ashless phenolic antioxidant has been investigated using a model hydrocarbon oxidation system in the presence of excess hydroperoxides. In order to approximate temperatures existing in critical engine locations, these studies were carried out at 160 deg C. Results obtained contribute to a better understanding of the antioxidant mechanisms of ZDTP and also provide basic information needed in development of laboratory test procedures for evaluation of engine oil antioxidant systems under realistic conditions.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Reprinted from SP-558 Lubricant and Additive Effects on Engine Wear. Fuels and Lubricants Meeting San Francisco, California, October 31-November 3, 1983.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • JOHNSON, M D
  • Korcek, S
  • Zinbo, M
• Publication Date: 1983

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 16 p.
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Antioxidants; Engine oils; Hydrogen peroxide; Laboratory tests; Oxidation
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00387290
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 831684 Reprint, HS-036 783
• Files: HSL, USDOT
• Created Date: Jul 30 1984 12:00AM