Abstract
In this work, a specially designed thin film cell was built to study the metal/lubricant interfacial region between iron and three test lubricants: (a) mineral oil with acid phosphate additive (b) mineral oil with oleic acid additive, and (c) engine oil. From the ac impedance spectra, the resistance and capacitance of the bulk layer were first determined. By changing the distance between two electrodes in the thin film cells, the resistivity, permittivity, and thickness of the metal/lubricant interfacial region were subsequently determined. For a lubricant containing oleic acid, which physically adsorbs on metal, the interfacial region was found to be quite thin. For chemically reactive lubricants such as engine oil or a blend containing acid phosphate additive, the interfacial region was significantly thicker.
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