Influence of Electrochemical Potentials on the Tribological Behavior of Silicon Carbide and Diamond-Coated Silicon Carbide

Abstract

Due to their high corrosion stability in combination with advantageous tribological performance, sintered silicon carbide ceramics are widely used in industrial applications. Both the corrosion stability and the tribological behavior can be affected by electrochemical processes. Tribological investigations were carried out using an electrochemical three electrode setup. The influence of electrochemical potentials on the friction and wear behavior of different sintered SiC materials in 1 M NaClsolution was investigated to analyze the complex interplay between mechanical, chemical, and electrochemical interactions during tribo-corrosion. The results revealed that friction and wear of SiC were decreased under cathodic electrochemical polarization depending on the material composition. In addition, tribological tests at different electrochemical potentials showed that the coefficient of friction can be switched immediately. The results indicated that the tribological behavior is strongly affected by the increased double-layer repulsion due to the electrochemical potentials, which supports the hydrodynamic lubrication.

Corrosive wear of multi-layer Fe-based coatings laser cladded from amorphous powders

“…Similar observations have been made by other investigators. For example, friction and wear of SiC were decreased under cathodic electrochemical polarization [27]. Even a threshold electrode potential could be found for a transition from low to high wear coefficients [30].…”

“…The electrochemical conditions determine material deterioration and the electrochemical potentials strongly influence the tribological behavior. Under an electrochemical potential, an electric double layer can be generated which consists of a compact layer (ions are strongly attracted to the wall surface and are immobile) and a diffuse double layer (ions are affected less by the electrical field and are mobile) [27]. For the effect of hydrodynamic lubrication, the COF is varied with the electrochemical potentials.…”

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

“…In a chloride environment for example there is a rapid passive film breakdown due to hydrolysis [48,49]. Recently published own work using ILs [50], aqueous solutions of ILs [51], and sodium chloride [52,53], we showed how strongly electrochemical potentials, applied in a three-electrode configuration [54], can improve friction, wear, and reduce tribocorrosive reactions. The Effect of potential in tribocorrosion of passive materials such as stainless steel has been previously studied and some degradation mechanisms have been already proposed [55,56].…”

Macroscopic Friction Studies of Alkylglucopyranosides as Additives for Water-Based Lubricants

“…In addition, some polymers (e.g., polyalkylene glycol [21]), ionic liquids (e.g., ibuprofen-based ionic liquids [22]) and surfactants (e.g., ammonium bromide cationic surfactant [23]) were identified as effective additives to form a protective film, offering better sliding properties and wear protection due to their special physicochemical properties. In case of an ionic liquid, for instance, imidazolium/phosphonium-based ionic liquids [24][25][26] and NaCl solutions [27] the surface adsorption can also be controlled by application of a galvanic potential.…”