부산대학교 도서관

The zinc dialkyl dithiophosphate (ZDDP) as multi-effect additive used in lubricating oil has always beenpaid more attention on the antioxidation, anticorrosion and antiwear performances. How to explain itsrole in tribology field has been paid more attention in the world. This studying showed a new insight intothe antiwear mechanism from the perspective of tribofilm of lubricating oil containing ZDDP using SEM/EDS, Raman spectrometer, atomic force microscope (AFM) etc. It was found that ZDDP tribofilm containeda little graphitic carbon and iron oxides besides metal phosphates and sulfides. The bonding of ZDDP tribofilmto the substrate was stronger than that of base oil (poly-alpha-olefin, PAO) tribofilm. The mechanicalproperties of ZDDP tribofilm were more stable than those of PAO tribofilm. Statistical analysisrevealed that ZDDP tribofilm was harder and less adhesive effects than PAO tribofilm, which might provideit with the ability to resist abrasive and adhesive wear. The similar elastic modulus of the two kindsof films indicated their similar plastic deformation. Moreover, the micro friction-reducing ability of ZDDPtribofilm might be the origin of ZDDP reducing the macro friction under boundary lubrication.