Tribological Study of Chemical States of Protective Oxide Film Formed on Steel After Sliding in Humid Atmosphere and in Aqueous Solutions

Abstract

A tribological study of low-carbon steel was carried out in humid atmospheres and in corrosive aqueous solutions (water and 1 percent H2O2 solution), to determine the chemical states of the protective oxide film and its tribological properties. The chemical states of the oxide film on the slid steel surface were determined using an electron probe microanalyzer. The analytical results showed that the Fe3O4 layer effectively reduced the friction coefficient, whereas FeO and Fe2O3 did not. The chemical states and compositions of the oxide film were attributed to the sliding conditions which induced the oxidation tribologically. And the oxide forms remained stable until analysis even in the aqueous solutions. Friction work was a simple and useful parameter for classifying corrosive and mechanical wear on the slid surface.

An experimental investigation of transient traction characteristics in rolling–sliding wheel/rail contacts under dry–wet conditions

“…If we can neglect the effect of water on the fluid lubrication [3] and assume that the effective hardness remains nearly constant, we can suppose that a tribochemical reaction film with water would aid in preventing the destruction of the oxide film at the starting stage. The oxide film would then be destroyed more moderately than under the dry condition, and the effective hardness would decrease due to the formation of the tribochemical reaction film, which would consist of a mixture of oxide and hydroxide [17][18][19]. In the process (b) → (c), the surface roughness does not vary and hardness decreases slightly.…”

Influence of Contact Stress on Surface Microstructure and Wear Property of D2/U71Mn Wheel-Rail Material

“…As the degree of wear increased, the contact area of the wheel-rail samples gradually was increased to cause the decrease of contact stress gradually. Moreover, the oxidative wear can also reduce the traction coefficient during the wear process [20]. Consequently, the traction coefficient gradually was decreased with the increase of cycles after the initial wear stage.…”

Electrolytic Al2O3 coating on Co-Cr-Mo implant alloys of hip prosthesis

“…14 However, ceramic coatings have been studied and continued as another means of improving the wear characteristics of articulating surfaces and/or the corrosion resistance of metal substrates. [15][16][17][18][19][20][21][22] In general, physical vapor deposition processes are limited to metal implants having complex geometries. Plasma spraying presents poor substrate-coating bond strength that can result in delamination in service and is also limited to its thickness larger than 30 m; such a thickness will seriously affect the precision of ball design.…”