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Nano-MoS₂-PEG coating cuts friction on steel by 66 %
A nano-MoS₂-PEG6000 modified epoxy resin coating applied to stainless steel reduces friction coefficients by 66.4 % and wear rates by 99.2 % under water-lubricated conditions, offering a promising surface solution for water hydraulic pump components.
Water-lubricated mechanical systems require surface modifications that promote the formation of stable lubricating films to minimise friction and wear. A research team has now developed a modified epoxy resin coating incorporating nano-MoS₂-PEG6000 fillers that significantly enhances the tribological performance of stainless steel under water lubrication.
The nano-MoS₂-PEG6000 fillers were prepared via a hydrothermal method and uniformly dispersed into an epoxy resin matrix. The resulting coating was applied to the surfaces of stainless steel substrates and slipper pairs. Tribological testing was carried out using a slipper-on-disk configuration under water-lubricated conditions.
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Dramatic reductions in friction and wear
The experimental results demonstrated exceptional performance improvements. The friction coefficient was reduced by 66.4 % compared to uncoated surfaces, while the wear rate decreased by 99.2 %. Additionally, the mechanical performance and wettability of the modified epoxy coating were enhanced relative to the unmodified system.
Characterisation of the wear mechanisms revealed a dual-action principle: the MoS₂ nanoparticles reduce shear forces between contacting surface asperities, while PEG6000 contributes a strong hydration capacity that promotes the formation of a stable water-lubricating film on the coating surface. This synergistic effect between the two filler components is key to the coating’s outstanding tribological behaviour.
A new approach for water hydraulic pump design
The study offers a novel strategy for the tribological design of slipper pairs in water hydraulic pumps, where conventional oil-based lubrication is being replaced by water for environmental and safety reasons. By combining the solid lubricant properties of nano-MoS₂ with the hydrophilic characteristics of PEG6000 within an epoxy resin matrix, the coating provides a practical and effective surface engineering solution for demanding water-lubricated applications.
Source: Fang, Y. et al., Enhancing water-lubricated tribological performance of stainless steel with nano-MoS₂-PEG6000 modified epoxy resin coatings. Progress in Organic Coatings 109917 (2025).
