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Abstract
The galling prevention property of oils containing oleyl acid phosphate (OLAP) and/or phosphoric acid has been investigated. A synergistic effect was observed with the oil containing these two additives. Heat-treatment was found to effectively enhance the galling prevention property of the oil. Surface analyses showed more phosphate formed on workpiece surfaces after the tests, using the oils with superior galling prevention property. Oil analyses suggested that OLAP, phosphoric acid and water associated to form molecular aggregates, and that the association between OLAP and phosphoric acid was promoted by heat-treatment. An oil with the highest, chemical reactivity and galling prevention property was obtained by the addition of the two additives to the base oil, followed fry heat-treatment at 120°C for one hour with stirring. The pretreatment of the workpieces in this oil further increased the galling prevention property due to the effect of phosphate films preformed on the. workpiece surfaces.
Presented as a Society of Tribologlsts and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Toronto, Ontario, Canada, October 8–10, 1990
Notes
Presented as a Society of Tribologlsts and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Toronto, Ontario, Canada, October 8–10, 1990