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RESEARCH PAPERS

Antiwear Mechanism of ZDDP in the Presence of Calcium Sulfonate Detergent

[+] Author and Article Information
Ph. Kapsa, J. M. Martin, C. Blanc, J. M. Georges

Ecole Centrale de Lyon, Laboratoire de Technologie des Surfaces, 69130-Ecully, France

J. of Lubrication Tech 103(4), 486-494 (Oct 01, 1981) (9 pages) doi:10.1115/1.3251714 History: Received December 15, 1979; Online November 17, 2009

Abstract

Interactions between zinc dithiophosphate (ZDDP) antiwear additive and commercial calcium sulfonate detergent are studied using a plane/plane contact configuration friction machine lubricated under boundary conditions. Comparative tests have allowed us to envisage three types of interactions, respectively, due to, — first: chemical interaction between both additives in the oil phase leading to an effective ZDDP concentration decrease. — second: detergent effect due to the presence of the calcium sulfonate surfactant molecule, preventing basal materials from agglomerating during running. — third: specific role due to the overbasing agent, considered as a colloidal dispersion. When an overbased detergent is used, the two latter contributions are predominant. This study suggests that a new approach in boundary lubrication should be envisaged in relation to the evolution of the interface products which must be regarded as a highly concentrated colloidal system.

Copyright © 1981 by ASME
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