Galvanically induced potentials to enable minimal tribochemical wear of stainless steel lubricated with sodium chloride and ionic liquid aqueous solution

查看全文 作　　者：Tobias [1]AMANN;Felix [1,2]GATTI;Natalie [1]OBERLE;Andreas [1]KAILER;Jürgen [3]RüHE

机构地区：[1]Fraunhofer Institute for Mechanics of Materials IWM;[2]Institute for Macromolecular Chemistry, University of Freiburg;[3]IMTEK-Department of Microsystems Engineering, University of Freiburg

出　　处：《Friction》索引2018年第6卷第2期,共13页

基　　金：the he MFW-BW(Ministeriumfür Wirtschaft,Arbeit und Wohnungsbau Baden-Württemberg,Project:BioSis)for funding this project 摘　　要：The effect of galvanically induced potentials on the friction and wear behavior of a 1 RK91 stainless steel regarding to tribocorrosion was investigated using an oscillating ball-on-disk tribometer equipped with an electrochemical cell. The aim of this investigation is to develop a water-based lubricant. Therefore 1 molar sodium chloride(NaCl) and 1% 1-ethyl-3-methylimidazolium chloride [C_2 mim][Cl] water solutions were used. Tribological performance at two galvanically induced potentials was compared with the non-polarized state: cathodic potential-coupling with pure aluminum- and anodic potential-coupling with pure copper. Frictional and electrochemical response was recorded during the tests. In addition, wear morphology and chemical composition of the steel were analyzed using scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS), respectively. The galvanically induced cathodic polarization of the stainless steel surface results in electrochemical corrosion protection and the formation of a tribolayer. Cations from the electrolyte(sodium Na^+ and 1-ethyl- 3-methylimidazolium [C_2 mim]^+) interact and adhere on the surface. These chemical interactions lead to considerably reduced wear using 1 NaC l(86%) and 1% 1-ethyl-3-methylimidazolium chloride [C_2 mim][Cl](74%) compared to the nonpolarized system. In addition, mechanical and corrosive part of wear was identified using this electrochemical technique. Therefore this method describes a promising method to develop water-based lubricants for technical applications. 关键词：sliding wear TRIBOCHEMISTRY potential controlled friction and wear galvanic coupling ionic liquids tribolayer formation

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Galvanically induced potentials to enable minimal tribochemical wear of stainless steel lubricated with sodium chloride and ionic liquid aqueous solution

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