Mechanisms of Antioxidant Decay in Gasoline Engines: Investigations of Zinc Dialkyldithiophosphate Additives

810014

02/01/1981

Event
SAE International Congress and Exposition
Authors Abstract
Content
Selected engine oils and zinc dialkyldithiophosphate additive concentrates have been added to used oils in various engines and subjected to engine testing. Oil samples obtained as a function of mileage accumulation have been analyzed using the peroxy radical titration method and 31P NMR. The engine studies were supplemented by laboratory investigations of antioxidant behavior of pure neutral and basic zinc dialkyldithiophosphates, dialkyldithiophosphoric acid, tetraalkylthioperoxydiphosphate (disulfide), and of neutral zinc dialkyldithiophosphate in combination with a hindered phenol antioxidant, 4,4′-methylenebis(2,6-di-tert-butylphenol). These investigations included studies of the effects of hydroperoxides and hydrocarbon oxidation products on the radical scavenging activity of the above compounds. The results obtained from engine and laboratory studies were used to assess the role and chemical changes of zinc dialkyldithiophosphate additives in radical scavenging processes in the engine.
Meta TagsDetails
DOI
https://doi.org/10.4271/810014
Pages
14
Citation
Korcek, S., Mahoney, L., Johnson, M., and Siegl, W., "Mechanisms of Antioxidant Decay in Gasoline Engines: Investigations of Zinc Dialkyldithiophosphate Additives," SAE Technical Paper 810014, 1981, https://doi.org/10.4271/810014.
Additional Details
Publisher
Published
Feb 1, 1981
Product Code
810014
Content Type
Technical Paper
Language
English