Aspects of Lubricant Oxidation

Stadtmiller, W. H.; Smith, A G

doi:10.1520/stp916-eb

Cited by 5 publications

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Oxidation of mineral base oils of petroleum origin: The relationship between chemical composition, thickening, and composition of degradation products

Maleville

Faure²,

Legros

et al. 1996

Lubrication Science

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The aim of this study was to improve understanding of high-temperature oxidation of base oils used in automobile engine oil formulations. Various oils were investigated: oils from the Middle East and the North Sea, with high and low aromatic and sulphur contents respectively; a hydro-isomerised polyalphaolefin oil with no aromatic or sulphur content; and a hydrocracked oil of intermediate composition.The influence of the aromatic and sulphur content and composition of the oils on thermo-oxidative degradation is investigated. These compoundsgive base oils natural protection from oxidation, but, under severe oxidation conditions, in the presence of a catalyst such as iron, which is always present i n a n engine, they become precursors of deposits.The action of two types of additive, radical inhibitors and hydroperoxide decomposers, was studied through oxygen consumption and thin-film oxidation tests.The oxidation products were identified; these provide insight into the degradation processes of the compounds during oxidation. They show too the influence of these processes on the formation of oxidised volatile species, on the increase in viscosity of the oil, and on the formation of oxidised species of high molar mass which, as they condense, contribute to the formation of insoluble compounds and deposits. RIrefractive index SEM scanning electron microscopy TFOUT uv ultraviolet (spectrometry) ZDTP thin film oxygen uptake test zinc alkyldithiophosphate (2 methyl, 4 pentyl)

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