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Insight into the Tribological Behavior of Dialkyldithiophosphate Ester in Steel/Aluminum Contact

In an attempt to better elaborate the tribological behavior of dialkyldithiophosphate ester (DDPE) in steel/aluminum contact, a universal friction and wear tribotester was used under different lubrication conditions. The morphology and microstructure of the worn surfaces was observed using scanning electron microscope (SEM), and then the surface chemistry of which was also analyzed using X-ray photoelectron spectroscopy (XPS). The results revealed that DDPE possessed excellent anti-wear and anti-friction properties, which contributed to lower friction coefficient at boundary lubrication region. As the addition of DDPE, the friction coefficient and wear rate of aluminum disk decreased by 2.7% and 21.6% respectively. Surface analysis confirmed the dissociation of DDPE in lubricating process and a tribofilm containing P and S elements was created on worn surfaces by physisorption and chemisorption.