Title: Effect of an iron-enriched aluminium surface fabricated via fine particle peening on tribological behaviour under oil lubrication

Authors: Yutaka Kameyama; Jun-Ya Tachizawa; Kazuki Seo; Ryota Shimazaki; Hideaki Sato; Ryokichi Shimpo

Addresses: Department of Mechanical Engineering, Tokyo City University, 1-28-1, Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan ' Graduate School of Integrative Science and Engineering, Tokyo City University, 1-28-1, Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan ' Department of Mechanical Engineering, Tokyo City University, 1-28-1, Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan ' Department of Mechanical Engineering, Tokyo City University, 1-28-1, Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan ' Department of Mechanical Engineering, Tokyo City University, 1-28-1, Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan ' Department of Mechanical Engineering, Tokyo City University, 1-28-1, Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan

Abstract: Although zinc dialkyldithiophosphate (ZnDTP) is a commonly used as a lubricant additive for suppressing wear, its effectiveness has been reported to be insufficient when it was applied to sliding components made of aluminium (Al). This study proposes a novel surface modification process that enhances the antiwear performance of ZnDTP on Al sliding components. Fine particle peening (FPP) was performed to transfer shot particle elements onto a peened surface. Fe elements that were to react with ZnDTP, forming an antiwear tribofilm during sliding, were concentrated onto the Al peened surface through FPP using steel shot particles. Results of tribological tests performed on the peened surface revealed that Fe elements introduced through FPP can act as an adsorption site of ZnDTP and contribute to iron phosphate formation. The Fe-enriched surface fabricated through FPP exhibited reduced wear compared to the untreated surface when the ZnDTP-derived tribofilm successfully functioned.

Keywords: peening; material transfer; ZnDTP; lubricant additives; tribofilm; tribology; friction coefficient; wear; surface texture; Al cast alloy; fine particle peening; FPP.

DOI: 10.1504/IJAT.2024.140494

International Journal of Abrasive Technology, 2024 Vol.12 No.2, pp.128 - 146

Received: 31 Jul 2023
Accepted: 17 Dec 2023
Published online: 20 Aug 2024 *

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