Synergistic effects between phosphonium-alkylphosphate ionic liquids and zinc dialkyldithiophosphate (ZDDP) as lubricant additives.

Qu, Jun; Barnhill, William C; Luo, Huimin; Meyer, Harry M; Leonard, Donovan N; Landauer, Alexander K; Kheireddin, Bassem; Gao, Hong et al. · Adv Mater · 2015

basic_science · Level V

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Abstract

Unique synergistic effects between phosphonium-alkylphosphate ionic liquids (ILs) and zinc dialkyldithiophosphate (ZDDP) are discovered when used together as lubricant additives, resulting in significant friction and wear reduction along with distinct tribofilm composition and mechanical properties. The synergism is attributed to the remarkably 30-70× higher-than-nominal concentrations of hypothetical new compounds (via anion exchange between IL and ZDDP) on the fluid surface/interface.