Several perfluoroarylmetallic and nonmetallic compounds were highly successful in reducing or eliminating corrosion of ferrous alloys, titanium alloys, and copper immersed in PR-143 at 550 to 600 F under oxidizing environment. No bulk fluid degradation occurred when the new PR-143 formulations were subjected to oxidative conditions at 600 F in the presence of titanium alloys. Specifically, perfluoroarylphosphine and perfluoro aryl-phosphine oxide were the most effective of the additive types investigated.
