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Study on tribological behavior, lubrication and anti-corrosion properties of W/O microemulsion for cold rolling of copper strip

Hao Wu (College of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, China)
Sang Xiong (College of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, China and Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing, China)
Wei Lin (College of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, China)
Fanxin Kong (College of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, China and Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 17 February 2021

Issue publication date: 2 June 2021

140

Abstract

Purpose

The purpose of this paper is to improve lubrication and anti-corrosion properties of the water-in-oil (W/O) microemulsion for rolling of copper strip and sheet to replace the traditional rolling oil.

Design/methodology/approach

The W/O microemulsion is prepared by using hydrogenated base oil, a deionized aqueous solution of 0.03 mol/L of Na2SO4 and composite emulsifier such as Sp20, Tx-7 or sodium petroleum sulfonate. Tribological behavior of the microemulsions and traditional cold rolling oil was conducted by MR-10A four-ball tester. The lubrication performance of microemulsion for cold rolling of copper strip was performed by cold-rolling experiment. The morphology of worn surface and the rolled copper was characterized. Anti-corrosion properties of microemulsion for rolled copper was investigated, and the corroded surface was analyzed by X-ray photoelectron spectrometer (XPS).

Findings

The results show that the extreme pressure and antiwear properties of the microemulsions have been improved; the average friction coefficient of the improved microemulsion is 0.065, which is 30% lower than the commercial cold rolling oil. For cold rolling of copper strip, the microemulsion has a higher thinning effect than the commercial cold rolling oil, and a smooth surface is obtained and the surface roughness (Sa) is decreased by 6.8%. The XPS analysis indicated microemulsion adsorbed on the copper surface mitigate the corrosion of oils.

Originality/value

This paper used the prepared W/O microemulsion as a new lubricant in the process of rolling for copper strip and sheet in industry, demonstrating the microemulsion has broad application prospects in the future.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0227/

Keywords

Acknowledgements

This study was funded by National Natural Science Foundation of China (No. 51474025), Natural Science Foundation of Jiangsu province (No. BK20181026), Project funded by China Postdoctoral Science Foundation (No. 2019M661461), and Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Foundation (No. ASMA201907 and ASMA201805). Challenge Cup of Nanjing Institute of Technology (TZ20200002), Jiangsu University Student Innovation Project (202011276076Y) and Outstanding Scientific and Technological Innovation Team in Colleges and Universities of Jiangsu Province.

Citation

Wu, H., Xiong, S., Lin, W. and Kong, F. (2021), "Study on tribological behavior, lubrication and anti-corrosion properties of W/O microemulsion for cold rolling of copper strip", Industrial Lubrication and Tribology, Vol. 73 No. 4, pp. 554-562. https://doi.org/10.1108/ILT-06-2020-0227

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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