Turbidimetric Spectroscopy for the Evaluation of Metalworking Fluids Stability

The stability of oil-in-water (O/W) emulsions used as metalworking fluids is a key factor for the economical and environmental balance of the entire metalworking process because used and broken fluids must be recycled or disposed. In this study, the ability of turbidimetric spectroscopy in the ultra...

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Bibliographic Details
Published in:Tribology transactions 2012-03, Vol.55 (2), p.237-244
Main Authors: Glasse, Benjamin, Fritsching, Udo, Koch, Thomas, De Paiva, Jose L., Guardani, Roberto
Format: Article
Language:English
Subjects:
Applied sciences
Emulsion Stability
Exact sciences and technology
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Metalworking Fluids
Spectroscopy
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Summary:The stability of oil-in-water (O/W) emulsions used as metalworking fluids is a key factor for the economical and environmental balance of the entire metalworking process because used and broken fluids must be recycled or disposed. In this study, the ability of turbidimetric spectroscopy in the ultraviolet and visible light range to detect metalworking fluids destabilization was evaluated. Destabilization was achieved by adding calcium chloride, thus achieving accelerated aging, which leads to coalescence, creaming, and complete emulsion separation. The stability of the metalworking fluids at 5% volumetric concentration in deionized water was monitored using a spectroscopic turbidimeter composed of an optical probe for in-line measurements. Destabilization was also monitored by measuring the vertical profile of backscattered and transmitted light. The results of this offline measurement system were compared with those from the in-line spectroscopic sensor, indicating that the latter can provide local, real-time information on emulsion destabilization, thus enabling control actions.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402004.2011.653871