Abstract
AbstractInvestigations of the effects of nitrogen oxides (NOX) on liquid phase oxidation and inhibition have been conducted in order to develop an improved understanding of the processes by which NOx accelerates oil degradation in internal combustion engines. Results from studies of the effects of NOx on oxidation of hexadecane (HD) alone, and in combination with a radical trapping (hindered phenol) antioxidant, and preliminary studies with zinc dialkyldithiophosphates (ZDTPs) were presented in previous reports.1‐3 The complexity of reactions involving NOx and the role in lubricant degradation of NOx from blowby were described. Those results suggested that NOx accelerates the rate of consumption of antioxidant additives and, thus, shortens the useful life of the oil. This work describes results of additional investigations with ZDTPs.
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