METHOD AND DEVICE FOR MEASURING THE EFFICACY OF A LUBRICATING OIL AND USES THEREOF

摘要

The invention concerns a method for measuring the efficacy of a lubricant by electrochemical impedance spectroscopy, which consists in: introducing the lubricant in a measuring cell comprising two metal electrodes; feeding said electrodes with at least a variable frequency voltage; measuring the impedance of the lubricant-electrode system in the high frequency range and in the low frequency range; simulating, by means of a software, an equivalent electric circuit supplying an impedance profile coinciding with the one measured with the cell; calculating, on the basis of said simulated equivalent electric circuit, at least a first specific parameter in the high frequency range and representing the modifications in the volume characteristics of the lubricant, and at least a second specific parameter in the low frequency range and representing surface characteristics of the lubricant. The invention also concerns a device for implementing said method.