Synergistic Effects Between Phosphonium‐Alkylphosphate Ionic Liquids and Zinc Dialkyldithiophosphate (ZDDP) as Lubricant Additives

• DOI: 10.1002/adma.201502037
• Publication Date: 2015-07-14T19:09:48Z
• Authors: Jun Qu; William C. Barnhill; Huimin Luo; Harry M. Meyer; Donovan N. Leonard; Alexander K. Land...; Bassem Kheireddin; Hong Gao; Brian L. Papke; Sheng Dai
• Keywords: Phosphonium

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 wear reduction along with distinct tribofilm composition mechanical properties. The synergism is attributed to the remarkably 30-70× higher-than-nominal concentrations of hypothetical new compounds (via anion exchange IL ZDDP) on fluid surface/interface.