Abstract
The effect of an electric field applied between rubbing surfaces on friction and wear characteristics was examined using a ball-on-disc testing apparatus under a mixed lubrication condition. The ball and disc were made of bearing steel with high hardness and plain carbon steel annealed with low hardness, respectively. The frictional characteristics were improved in an electric field in which the disc was the anode, but by applying an electric field in which the disc was the cathode the frictional characteristic was deterionated. The improvement resulted from the formation of a passive-state film on the disc surface of the anode. There were limiting values of voltage and electric current externally applied to form the passive-state surface film. Applying electric field below the limiting values could not form the effective passive state film. The limiting values were also influenced by the amount of oxygen dissolved in the oils tested.
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