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    The relationship between friction and wettability in aqueous environment

    Year: 2011

    Journal: Wear, Volume 271, Issues 9-10, 29 July 2011, Pages 1745-1749, 20111221

    Authors: Z. Pawlak a,b,* , W. Urbaniak b,c , A. Oloyede d

    Organizations: a Tribochemistry Consulting, Salt Lake City, UT 84117, USA, b Biotribology Laboratory, University of Economy, Garbary 2, 85-229 Bydgoszcz, Poland, c Kazimierz Wielki University, Faculty of Mathematics, Physics and Technical Sciences, 85-867 Bydgoszcz, Chodkiewicza 30, Poland, d Queensland University of Technology, School of Engineering Systems, GPO Box, 2434 Brisbane, Q 4001, Australia

    In this study, the influence of surface wettability (θ) and interfacial energy (γ) on the coefficient of friction (f) of tribopair surfaces in aqueous environment was investigated using a tribotester. The wettability behaviour of various tribopair surfaces [hydrophilic (HL) and hydrophobic (HB)]: (HL–HL), (HB–HB) and (HB–HL) was characterized by friction properties in water and aqueous two-phase lubricants (water + additive). The results show that the level of wettability of the tribopairs [the so-called delta wettability, Δθ = (θDisc − θPin)] is related to friction coefficient (f) in aqueous environment. In view of recent results, we conclude that both the interfacial energy and wettability of tribopair surfaces adequately characterize the lubrication processes.