Film forming characteristics of oil-in-water emulsion with super-low oil concentration

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 340; no. 1; pp. 70 - 76
• Main Authors: Ma, Liran, Luo, Jianbin, Zhang, Chenhui, Liu, Shuhai, Lu, Xinchun, Guo, Dan, Ma, J.B., Zhu, T.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.05.2009; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; Emulsion; Emulsions. Microemulsions. Foams; Exact sciences and technology; Film thickness; General and physical chemistry; Low oil concentration; Particle size distribution; Surface physical chemistry; Low oil concentration; Particle size distribution; Emulsion; Film thickness; Oil water emulsion; Film; Glass; Transition metal; Steel; Lubricant; Thickness; Lubricating film; Oil; Chromium; Formation mechanism
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2009.03.006

The oil-in-water emulsion has been widely used as lubricant in metal working such as metal rolling and cutting. The film formation ability of emulsion was considered as an important evaluation factor. Thus the film formation mechanism and characteristics of emulsion have been widely investigated. However, the mechanism is still dubious and film forming characteristics were seldom discussed under an oil volume percentage of 0.05%. In this paper, a lubricating film testing apparatus is used to investigate the film forming characteristics of oil-in-water emulsion between the surface of a steel ball and that of a glass disc coated with chromium. By carrying out experiments under extremely low oil volume percentages (0.005–2.5%), some new phenomena are found in our program. The film formation mechanism of oil-in-water emulsion is discussed based on the different film forming performances of emulsion with different oil volume percentages. New viewpoints on the film formation of emulsion are put forward in this paper.