Abstract
The process of lubricant penetration into frictional interfaces has not been fully established, hence compromising their tribological performance. In this study, the penetration characteristics of deionized water (DI water) containing an electroosmotic suppressant (cetyltrimethylammonium bromide (CTAB)) and an electroosmotic promoter (sodium lauriminodipropionate (SLI)), were investigated using steel-on-steel friction pairs. The results indicated that the lubricant with electroosmotic promoter reduced the coefficient of friction and wear scar diameter, whereas that with an electroosmotic suppressant exhibited an opposite behavior compared with DI water. The addition of SLI promoted the penetration of the DI water solution, thus resulting in the formation of a thick lubricating film of iron oxide at the sliding surface. This effectively reduced the abrasion damage, leading to a lower coefficient of friction and wear loss.
Highlights
In mechanical systems, lubricants are widely used to reduce friction and improve worn surface quality [1]
When the concentration of SLI reached 0.1 mM, the best performance was recorded, in which the COF and wear scar diameters (WSDs) were 22.7% and 10.7% lower than those of DI water, respectively. These results suggest that the addition of SLI promotes the electroosmotic flow (EOF) toward the deeper friction interface, leading to more lubricants entering into the capillaries of the friction interface to participate in the anti-wear process, resulting in the reduction of the COF and WSD
The EOF velocities of pure DI water, DI water with CTAB, and DI water with SLI in steel capillaries with different inner diameters were verified by measurements under different electric fields
Summary
Lubricants are widely used to reduce friction and improve worn surface quality [1]. Lubricants can enter contact surfaces to form lubricating films through the gaps at the tool–chip interface, which generates a film-to-film contact of low shearing resistance and improves interfacial friction and wear conditions. Many of authors [3, 5] believed that these capillaries play a critical role in lubricant penetration. These capillaries serve as passageways by which lubricants can enter and wet the contact interface and promote the formation of lubricating films. The study reported in Ref. [8]
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