The use of new lubricants (modified magnetic fluids containing nanodispersed magnetic particles) in friction units of machines and mechanisms makes it possible to increase their reliability, quality and expand their functionality. In order to predict the operational properties of friction units lubricated with magnetic oil, the specific physicochemical features of the processes occurring on solid surfaces after applying a magnetic lubricant have been studied in detail. The energy changes occurring on the surface after applying magnetic oil to it were evaluated from the work function of electrons. The dynamics of change in the contact potential difference between metal surfaces lubricated with magnetic oil and its components has been studied. It is shown that the lubricating properties of the studied liquids correlate with the magnitude of the change in the contact potential difference after their application. In general, the contact potential difference between surfaces lubricated with magnetic oils is higher than those lubricated with a dispersion environment of magnetic oils. Using a two-component magnetic oil, the effect of dispersed magnetite particles on the work function has been studied. Particles of magnetite adhere to the surface under the action of van der Waals or dipole interaction and partially screen it. It follows from the data obtained that the addition of magnetic particles to the liquid of triethanolamine does not lead to a significant change in the work function in the entire time range. At the same time, magnetite particles covered with a layer of adsorbed fatty acid molecules increase the work function of electrons. Based on a large amount of empirical data, it can be qualitatively concluded that the work function of the sample surface from a magnetized material, which is covered with magnetic oil, stabilizes faster than for the surface of a demagnetized sample. It is not possible to quantify this difference due to the low reproducibility of the results.

Topics
Work functions, Electrostatics, Minerals, Chemical elements, Magnetic fluids, Fatty acids
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