Nucleation and formation of oxide film with the magnetic field on dry sliding contact of ferromagnetic steel

Abstract

The nucleation and formation of oxide film in unidirectional dry sliding contact has been studied in a vacuum chamber with and without the application of a magnetic field in the intention of identifying the role of magnetic intensity on the oxidation wear. The wear tests of the steel AISI 1045/steel AISI 1045 couple are investigated on a pin‐disc configuration under three various gas environments: in ambient air, under oxygen at 105 Pa and in vacuum at 5.10−5 Pa. The formation of oxide layer strongly depends on oxygen partial pressure and magnetic field intensity.These took the form of protective raised ‘islands’ of compacted debris which is developed gradually but rapidly increased as the oxygen partial pressure is increased and which could persist for extended periods during subsequent evacuation. Evidence from various experimental techniques indicates that the compacted debris is a mixture of iron oxides in the form of oxide‐covered particles, although the depth of oxide film has not yet been fully elucidated. Copyright © 2010 John Wiley & Sons, Ltd.

Friction in vacuum and under different gaseous environment of magnetized sliding ferromagnetic contact

“…The microscopy analysis show that the oxygen rate adsorbed on the worn surface of the disc varies with the applied magnetic intensity. 9 The oxygen rate adsorbed on the worn surface in ambient air without magnetic field is almost the same throughout the contact surface. So, almost no trace of oxygen is detected.…”

“…However, the surface oxide coating is mainly composed of magnetite Fe 3 O 4 oxide and a little quantity of hematite α-Fe 2 O 3 . 9…”

“…Hiratsuka and Sasada 6 and Bhushan and others have observed a severe-mild wear transition and reduction of wear rate and friction coefficient in air due to the magnetic field during pin on disc experiments carried out for Ni/Ni and Fe/Fe contacts. In that way, Paulmier, El Mansori and Zaidi 7–13 have observed a decrease in the wear rate and friction coefficient of a magnetized steel/steel couple in ambient air.…”

“…The effect of magnetic field on friction and wear mode has been studied by some researchers. 3–10 After all works realized on this subject, it is difficult to draw definitive conclusions. In 1970 Muju and Ghosh 3 were certainly the first to observe the effects of magnetic field on wear mode of different metallic materials, and their results have shown that the magnetic field increases the hardness of the sliding surface and magnetic permeability.…”

Behavior of Wear Debris and Its Action Mechanism on the Tribological Properties of Medium-Carbon Steel with Magnetic Field

“…Further, wear debris is also assumed to influence the tribological properties of materials subjected to a magnetic field [1,14,15,16]. However, in studies on the oxidation mechanism during friction, wear debris is unavoidable [17,18,19,20]. Therefore, it plays an important role in dictating tribological properties during friction under the action of a magnetic field.…”