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Tribology Transactions Volume 51, 2008 - Issue 5
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Original Articles

Experimental and Molecular Dynamics Simulations of Tribochemical Reactions with ZDDP: Zinc Phosphate–Iron Oxide Reaction

Clotilde Minfray Ecole Centrale de Lyon Ecully, Cedex, France
,
Thierry Le Mogne Ecole Centrale de Lyon Ecully, Cedex, France
,
Jean-Michel Martin Ecole Centrale de Lyon Ecully, Cedex, France
,
Tasuku Onodera Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Sayaka Nara Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Shuko Takahashi Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Hideyuki Tsuboi Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Michihisa Koyama Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Akira Endou Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Hiromitsu Takaba Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
,
Momoji Kubo Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan; PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
,
Carlos A. Del Carpio Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan
&
Akira Miyamoto Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan; New Industry Creation Hatchery Center, Tohoku University, Aoba-ku, Sendai, Japan
 show all
Pages 589-601 | Received 31 Mar 2007, Accepted 01 Feb 2008, Published online: 15 Oct 2008
 
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Abstract

Zinc phosphate glass is considered to be the main constituent of tribofilms generated under boundary lubrication with zinc dialkyldithiophosphate (ZDDP), a well-known antiwear additive. The reaction occurring during friction between zinc phosphate glasses and steel native iron oxide layer is investigated by both an experimental approach and by Molecular Dynamics simulations (MD). The importance of this “tribochemical” reaction in the general ZDDP antiwear process is discussed.

ACKNOWLEDGEMENTS

The authors thank Prof. Koji Kato and Dr. Kosuke Ito of the Department of Mechanical Systems and Design, Tohoku University, for their positive contribution in the etablishment of the collaboration between the LTDS and Miyamoto Laboratory. They also thank the Japanese Society for the Promotion of Science for financial support in Japan for one of the authors. They would like also to thank Béatrice Vacher for the TEM pictures.

Review led by Elaine Yamaguchi

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