NEOPENTYL POLYOL ESTERS FOR JET ENGINE LUBRICANTS-EFFECT OF TRICRESYL PHOSPHATE ON THERMAL STABILITY AND CORROSIVITY
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
Chrome-alloy steel AMS-5504 and mild steel promote thermal decomposition of most neopentyl polyol ester base stocks and some Specification MIL-L-23699 lubricant formulations at 500F. Without metals, these esters are stable at this temperature. A few such polyol ester base stocks show a much lower sensitivity to steel at 500F these exceptions are attributed to the effect of as yet unidentified components. Tricresyl phosphate TCP in 1 to 5 percent concentration effectively stabilizes metal-sensitive polyol esters by passivating the active metal surfaces. As in the case of the diester oils, the combination of TCP and water promotes ester hydrolysis and lead corrosivity this hydrolytic degradation is inhibited by suitable aliphatic amines.
- Lubricants and Hydraulic Fluids