Mixed lubrication of steel by C18 fatty acids revisited. Part I: Toward the formation of carboxylate

S. Loehlé; C. Matta; C. Minfray; T. Le Mogne; R. Iovine; Y. Obara; A. Miyamoto; J. M. Martin

doi:10.1016/j.triboint.2014.10.020

Mixed lubrication of steel by C18 fatty acids revisited. Part I: Toward the formation of carboxylate

S. Loehlé, C. Matta, C. Minfray, T. Le Mogne, R. Iovine, Y. Obara, A. Miyamoto, J. M. Martin

New Industry Creation Hatchery Center (NICHe)

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

The requirements in automotive lubrication impose more complex lubricant formulation. For environmental issues, it is important to reduce additives containing sulfur and phosphorous compounds. We propose to revisit the lubrication of steel by stearic acid with a new approach combining experimental and molecular simulation techniques. The adsorption mechanism of stearic acid on iron oxide surface is investigated by ultra-accelerated quantum chemistry molecular dynamics simulations. Adsorption experiments are performed followed by in-situ XPS and ex-situ PMIRRAS analyses. The adsorption mechanism occurred through the acid group mainly by chemisorption. Friction behavior of stearic acid with iron oxide is studied. Results suggest that the friction process favors the formation of carboxylate function. The low friction behavior seems to be related to the generation of a SAM strongly bonded to the surface.

Original language	English
Pages (from-to)	218-227
Number of pages	10
Journal	Tribology International
Volume	82
Issue number	PA
DOIs	https://doi.org/10.1016/j.triboint.2014.10.020
Publication status	Published - 2015 Feb

Keywords

Adsorption
Computer simulation
Friction
Organic friction modifiers

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Surfaces and Interfaces
Surfaces, Coatings and Films

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abstract = "The requirements in automotive lubrication impose more complex lubricant formulation. For environmental issues, it is important to reduce additives containing sulfur and phosphorous compounds. We propose to revisit the lubrication of steel by stearic acid with a new approach combining experimental and molecular simulation techniques. The adsorption mechanism of stearic acid on iron oxide surface is investigated by ultra-accelerated quantum chemistry molecular dynamics simulations. Adsorption experiments are performed followed by in-situ XPS and ex-situ PMIRRAS analyses. The adsorption mechanism occurred through the acid group mainly by chemisorption. Friction behavior of stearic acid with iron oxide is studied. Results suggest that the friction process favors the formation of carboxylate function. The low friction behavior seems to be related to the generation of a SAM strongly bonded to the surface.",

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T2 - Toward the formation of carboxylate

AU - Loehlé, S.

AU - Matta, C.

AU - Minfray, C.

AU - Mogne, T. Le

AU - Iovine, R.

AU - Obara, Y.

AU - Miyamoto, A.

AU - Martin, J. M.

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AB - The requirements in automotive lubrication impose more complex lubricant formulation. For environmental issues, it is important to reduce additives containing sulfur and phosphorous compounds. We propose to revisit the lubrication of steel by stearic acid with a new approach combining experimental and molecular simulation techniques. The adsorption mechanism of stearic acid on iron oxide surface is investigated by ultra-accelerated quantum chemistry molecular dynamics simulations. Adsorption experiments are performed followed by in-situ XPS and ex-situ PMIRRAS analyses. The adsorption mechanism occurred through the acid group mainly by chemisorption. Friction behavior of stearic acid with iron oxide is studied. Results suggest that the friction process favors the formation of carboxylate function. The low friction behavior seems to be related to the generation of a SAM strongly bonded to the surface.

KW - Adsorption

KW - Computer simulation

KW - Friction

KW - Organic friction modifiers

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