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Article

Tribochemical Interactions between Graphene and ZDDP in Friction Tests for Uncoated and W-DLC-Coated HS6-5-2C Steel

1
Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, 25-614 Kielce, Poland
2
Air Force Institute of Technology, 01-494 Warsaw, Poland
3
Oil and Gas Institute-National Research Institute, 31-503 Cracow, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Sergei Yu Tarasov
Materials 2021, 14(13), 3529; https://doi.org/10.3390/ma14133529
Received: 1 June 2021 / Revised: 16 June 2021 / Accepted: 18 June 2021 / Published: 24 June 2021
If a lubricant contains structures capable of conducting energy, reactions involving zinc dialkyldithiophosphate (ZDDP) may take place both very close to and away from the solid surfaces, with this indicating that ZDDP can be a highly effective anti-wear (AW) additive. The central thesis of this article is that the tribocatalytic effect is observed only when the energy emitted by the solids is transmitted by ordered molecular structures present in the lubricant, e.g., graphene. The friction tests were carried out for 100Cr6 steel balls in a sliding contact with uncoated or W-DLC-coated HS6-5-2C steel discs in the presence of polyalphaolefin 8 (PAO 8) as the lubricant, which was enhanced with graphene and/or ZDDP. There is sufficient evidence of the interactions occurring between ZDDP and graphene and their effects on the tribological performance of the system. It was also found that the higher the concentration of zinc in the wear area, the lower the wear. This was probably due to the energy transfer resulting from the catalytic decomposition of ZDDP molecules. Graphene, playing the role of the catalyst, contributed to that energy transfer. View Full-Text
Keywords: graphene; diamond-like carbon; zinc dialkyldithiophosphate; lubricant additive; surface layers of solid elements graphene; diamond-like carbon; zinc dialkyldithiophosphate; lubricant additive; surface layers of solid elements
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MDPI and ACS Style

Kowalczyk, J.; Madej, M.; Dzięgielewski, W.; Kulczycki, A.; Żółty, M.; Ozimina, D. Tribochemical Interactions between Graphene and ZDDP in Friction Tests for Uncoated and W-DLC-Coated HS6-5-2C Steel. Materials 2021, 14, 3529. https://doi.org/10.3390/ma14133529

AMA Style

Kowalczyk J, Madej M, Dzięgielewski W, Kulczycki A, Żółty M, Ozimina D. Tribochemical Interactions between Graphene and ZDDP in Friction Tests for Uncoated and W-DLC-Coated HS6-5-2C Steel. Materials. 2021; 14(13):3529. https://doi.org/10.3390/ma14133529

Chicago/Turabian Style

Kowalczyk, Joanna, Monika Madej, Wojciech Dzięgielewski, Andrzej Kulczycki, Magdalena Żółty, and Dariusz Ozimina. 2021. "Tribochemical Interactions between Graphene and ZDDP in Friction Tests for Uncoated and W-DLC-Coated HS6-5-2C Steel" Materials 14, no. 13: 3529. https://doi.org/10.3390/ma14133529

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