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/

中文翻译：

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W/O微乳液用于铜带冷轧的摩擦学、润滑和防腐性能研究

目的

本文的目的是提高油包水（W/O）微乳液用于铜带板轧制的润滑和防腐性能，以替代传统的轧制油。

设计/方法/方法

W/O微乳液由氢化基础油、0.03mol/L的Na2SO4去离子水溶液和Sp20、Tx-7或石油磺酸钠等复合乳化剂制备而成。微乳液与传统冷轧油的摩擦学行为采用MR-10A四球试验机进行测试。通过冷轧实验研究了微乳液对铜带冷轧的润滑性能。对磨损表面和轧制铜的形貌进行表征。研究了微乳液对压延铜的防腐性能，并用X射线光电子能谱仪（XPS）分析了腐蚀表面。

发现

结果表明，微乳液的极压性能和抗磨性能得到了提高；改进后的微乳液平均摩擦系数为0.065，比商品冷轧油低30%。对于铜带冷轧，微乳液比市售冷轧油具有更高的稀释作用，表面光滑，表面粗糙度（Sa）降低6.8%。XPS 分析表明吸附在铜表面上的微乳液减轻了油的腐蚀。

原创性/价值

本文将制备的W/O微乳液作为工业上铜带板轧制过程中的一种新型润滑剂，表明该微乳液在未来具有广阔的应用前景。

同行评审

本文的同行评审历史可从以下网址获得：https://publons.com/publon/10.1108/ILT-06-2020-0227/