Abstract
Oxidation testing during automatic transmission fluid (ATF) development showed various degrees of nylon component degradation by thermal mechanical analysis (TMA) and thermogravimetric analysis (TGA). The especially sensitive nylon components were the pump rotor guides and thrust washers. ATFs formulated to contain basic reserve additives (overbased calcium sulfonates) were observed to inhibit nylon transmission component degradation. The inhibition is hypothesized to occur by neutralization of acidic oxidation by-products and formation of stabilizing chemical films on the surface of the nylon components. Nylon parts tested with ATFs not containing basic reserve additives were susceptible to aggressive degradation.
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