Interactions in Neopentyl Polyol Ester—Tricresyl Phosphate—Iron Systems at 500 F

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Abstract
Neopentyl polyol esters, typical of turbine engine lubricant base stocks, are thermally stable at 500 F, unless, as reported by others, ferrous metals are present; in the latter case oil degradation and metal corrosion are severe. Tricresyl phosphate (TCP) stabilizes the metal-ester system by generating a passive oxide film on the active metal surface. In the presence of water, TCP accelerates ester hydrolysis, resulting in acids corrosive to lead. Aliphatic amines which react with TCP acidic impurities or breakdown products reduce the catalyzed hydrolysis of the esters. TCP reacts with free carboxylic acids to generate corrosive phosphoric-type acids. Reaction mechanisms are postulated.