Corrosion Characteristics of Rolling Oil on the Rolled Copper Foil.

Lei Xia,Sang Xiong,Zhengyi Jiang,Yan Li,Shen Zhao

doi:10.3390/ma13214933

Abstract

Static corrosion experiments were carried out to investigate the corrosion of each kind of component in the rolling oil on the rolled copper foil. The surface morphology and chemical composition of corrosion products were detected by a digital camera, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that the maximum corrosion rate of rolled copper foil in the base stock and friction modifiers (butyl stearate and dodecanol) was close to zero, while that of rolled copper foil in the N-containing borate, phosphate and the fully formulated rolling oil were 0.17, 1.12 and 0.78 mm/a, respectively. The color of rolled copper foil changing from pink into purple-black when corroded in the N-containing borate. The composition of it was mainly CuO and Cu2O with some N-containing borate adsorbed on it. However, the color and composition of the corroded copper foil in the phosphate were similar to that of the original copper foil. It was complicated for the corroded copper foil in the fully formulated rolling oil, which showed characteristics both in the N-containing borate and in the phosphate according to different positions. It indicated that there might be little corrosion for the base stock and friction modifiers on the rolled copper foil. It might mainly be extreme pressure additives (N-containing borate and phosphate) that caused the corrosion of rolled copper foil. There might be competition between N-containing borate and phosphate for the corrosion of rolled copper foil in the fully formulated rolling oil, resulting in a lower corrosion rate compared with that in the phosphate.

Highlights

With the rapid development of the electronic information industry, more and more attention has been paid to the rolled copper foil due to its high quality and high reliability [1,2]
The white oil was selected as the base stock, butyl stearate and dodecanol were used as friction modifiers, and nitrogen-containing borate and phosphate were chosen as extreme pressure additives
The results shown of corrosion on micro-morphology the micro-morphology the rolled foil surface

Summary

Introduction

With the rapid development of the electronic information industry, more and more attention has been paid to the rolled copper foil due to its high quality and high reliability [1,2]. The rolling oil used in lubrication may cause corrosion to the surface of rolled copper foil and affect the quality of rolled copper foil. Materials 2020, 13, 4933 lubrication should not lead to corrosion on the surface of rolled copper foil, in addition to excellent lubricity It is always contradictory between improving the lubricity of rolling oil and reducing the corrosion of rolling oil on the rolled copper foil. Functional additives, such as friction modifiers, extreme pressure agents, are often added into the rolling oil to improve its lubricating performance [6,7,8]. The research results might provide a reference for selecting less corrosive additives used in the rolling oil and develop rolling oils with better performance

Corrosion Test

Molecular

Corrosion

Corrosion Rate

Conclusions