Active Control of Boundary Lubrication of Ceramic Tribo-Pairs in Sodium Dodecyl Sulfate Aqueous Solutions

Abstract

The objective of the study is to actively control friction between engineering ceramics in underwater applications. By designing a proper electrode system and applying an external electric field, the active control of friction between Al 2 O 3 plate and ZrO 2 ball in sodium dodecyl sulfate (SDS) aqueous solutions has been realized, which is different from the previous studies of potential controlled boundary lubrication where at least one part of tribo-pairs is a conductor. Reversible change of friction coefficient has been observed in the range from 0.12 to 0.35. An indirect electric field-assisted adsorption model has been proposed to explain the observed phenomena. The addition of inorganic salts containing counterions to the SDS solution or increasing the concentration of SDS can shorten the response time of friction to the variation of the applied electric field by facilitating the formation of SDS micelles. This opens a new way to realize the active control of friction for insulative tribo-pairs without corrosion.

Effect of Sodium Alkane Sulfonate Addition on Tribological Properties of Emulsion for Cold Rolling Strips: Experimental and Simulation Investigations

“…properties by applying an external electric field [29,33]. However, the interaction between SAS and polar additives is rarely studied.…”

“…Sodium alkane sulfonate (SAS) is a type of anionic surfactant composed of an alkyl chain and a sulfonic group. It has anti-rush [20,30], emulsification [32], and certain lubrication effects [29,33]. SAS is a classic corrosion inhibitor widely used in the industry for temporary rust prevention [34].…”

“…Zhu et al showed that the monolayer is effective with respect to corrosion inhibition, and the formation of bilayers/multilayers/semi-micelles does not contribute considerably to more corrosion inhibition [36]. Some studies have shown that SAS can affect tribological properties by applying an external electric field [29,33]. However, the interaction between SAS and polar additives is rarely studied.…”

Mitigation of tribocorrosion of metals in aqueous solutions by potential-enhanced adsorption of surfactants

“…( 14), the charging current reaches its maximum when t = 0 (at the moment of a voltage step change), and then decreases exponentially [23]. This equation can be used to explain the exponential decline of current over time for stainless steel in aqueous solution with 1 mM sodium dodecyl sulfate (SDS) and 10 mM NaCl, when the surface potential was changed from -0.1 to +0.2 V at 0 s in our previous research [27]. Most importantly, according to Eq.…”

Influence of Adsorption Characteristics of Surfactants Sodium Dodecyl Sulfate and Aerosol–OT on Dynamic Process of Water-Based Lubrication

“…Zhang studied the relationship between the adsorption structure and COF [31]. Siqing and Liu applied different electrode potentials to the friction pair to control the adsorption/desorption of SDS and its tribological properties [32][33][34]. As another widely studied surfactant in aggregation and wetting, sodium bis (2-ethylhexyl) sulfosuccinate (Aerosol-OT, AOT) is double-chained, with the same number of carbon atoms in the main carbon chains as SDS, as shown in Figure 1b.…”