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Lubricants 2017, 5(1), 1; doi:10.3390/lubricants5010001

Surface Film Adsorption and Lubricity of Soybean Oil In-Water Emulsion and Triblock Copolymer Aqueous Solution: A Comparative Study

School of Mechanical, Materials and Mechatronics Engineering, University of Wollongong, Wollongong 2522, NSW, Australia
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Author to whom correspondence should be addressed.
Academic Editor: Robert J. K. Wood
Received: 21 July 2016 / Revised: 23 December 2016 / Accepted: 23 December 2016 / Published: 30 December 2016
(This article belongs to the Special Issue Green Tribology)
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Abstract

This paper investigates the surface film adsorption and lubricity of two different types of potential environmentally friendly cold metal forming lubricants: soybean vegetable oil in water VO/W emulsions and triblock copolymer aqueous solutions. The lubricants have different visual appearance, surface film adsorption characteristic, lubricity and surface cleaning behaviour. The effects of concentration, temperature and emulsification ultrasonic energy (for VO/W emulsion) are studied. The result shows that the soybean VO/W emulsions have stronger adsorption, superior lubricity and anti-wear property compared to the copolymer solutions. The effect of temperature is investigated at 30 °C and 65 °C which are below and above cloud point of the aqueous copolymer solutions. Both lubricants show improved friction and anti-wear property at 65 °C. However, tenacious residual film remained on the discs surface after surface cleaning indicates lower cleanability of the soybean VO/W emulsions compared to the copolymer solutions, postulating the need for extra post-processing cleaning operations after cold forming process with VO/W emulsion lubricant. View Full-Text
Keywords: adsorption; environmentally friendly lubricant; lubricity; vegetable oil in water emulsion; triblock copolymer solution adsorption; environmentally friendly lubricant; lubricity; vegetable oil in water emulsion; triblock copolymer solution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Taheri, R.; Kosasih, B.; Zhu, H.; Tieu, A.K. Surface Film Adsorption and Lubricity of Soybean Oil In-Water Emulsion and Triblock Copolymer Aqueous Solution: A Comparative Study. Lubricants 2017, 5, 1.

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