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The Penn State microoxidation test was used to study the effets of metals—copper, brass, aluminum, stainless steel, lead, and low-carbon steel—on the high-temperature oxidation of two esters di-2-ethylhexyl sebacate and trimethylolpropane triheptanoate. The results demonstrate that metal corrosion and sludge formation are interrelated and are greatly accelerated by intimate contact of air, lubricant and metal surface.
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Lahijani et al. (1982) studied this question.
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