科研之友
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摘要
The zinc dialkyl dithiophosphate (ZDDP) as multi-effect additive used in lubricating oil has always been paid more attention on the antioxidation, anticorrosion and antiwear performances. How to explain its role in tribology field has been paid more attention in the world. This studying showed a new insight into the 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 contained a little graphitic carbon and iron oxides besides metal phosphates and sulfides. The bonding of ZDDP tri-bofilm to the substrate was stronger than that of base oil (poly-alpha-olefin, PAO) tribofilm. The mechan-ical properties of ZDDP tribofilm were more stable than those of PAO tribofilm. Statistical analysis revealed that ZDDP tribofilm was harder and less adhesive effects than PAO tribofilm, which might pro-vide it with the ability to resist abrasive and adhesive wear. The similar elastic modulus of the two kinds of films indicated their similar plastic deformation. Moreover, the micro friction-reducing ability of ZDDP tribofilm might be the origin of ZDDP reducing the macro friction under boundary lubrication.
