Synergistic effects in binary systems of lubricant additives: a chemical hardness approach
作者： Jean‐Michel Martin , Carol Grossiord , Karine Varlot , Béatrice Vacher , Jinichi Igarashi
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摘要: Tribochemical interactions between antiwear zinc dithiophosphate (Zndtp), friction modifier molybdenum dithiocarbamate (Modtc) and detergent overbased calcium borate (CB) lubricant additives have been investigated by coupling analytical TEM micro‐spot XPS in the tribotester Optimol of SRV GmbH (mild wear conditions boundary lubrication). Synergistic effects observed on both data, especially Modtc/Zndtp combination. Results interpreted basis a chemical hardness concept: hard soft acids bases (HSAB) principle, stabilisation hard–hard pairs maximum principle. The performance mixture is mainly due to generation MoS2 single sheets digestion MoO3, which also formed, polyphosphate glass. final result tribochemical reaction tribofilm composed embedded mixed Mo/Zn CB/Modtc has similar mechanism except that oxide not completely eliminated, softer anion compared with phosphate one.
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