Measurement of Levels of Dross Intermetallic Particles in 55%Al-Zn Alloy Based Metal Coating Bath by Pressure Filtration Technique
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A pressure filtration technique was used to measure levels of dross intermetallic compound particles (IMCs) to assess overall metal cleanliness of 55%Al-Zn alloy-based metal coating bath. The weight of molten metal passing through a micro-filter was measured at constant pressure and temperature using a Prefil-Footprinter, a portable inclusion analyser. Fundamental cake filtration theory was applied to analyse Prefil data. Inverse average filtration rate (t/V) and dt/dV was plotted as a function of cumulative filtrate vol-ume (V ) to generate filtrations curves. Cake mode filtration parameters were determined from linearized plots of a constant pressure filtration equation (t/V=μαavC----------------2A2ΔP+μRm/APΔ) The linear diagram in the dt/dV form was used to assess deviations due to secondary effects. The IMC mass captured/unit volume of filtrate was calculated based on chemical analysis of the filter cake and standard cake mode filtration parameters. Detailed microstructural analysis was carried out to characterize the nature of IMCs captured in the filter cake. Fundamental cake fil- tration theory together with microstructural analysis of the filter cake can provide a quantitative measure for lev- els of IMCs present in the bath and overall metal cleanliness of the coating bath.
Abstract
A pressure filtration technique was used to measure levels of dross intermetallic compound particles (IMCs) to assess overall metal cleanliness of 55%Al-Zn alloy-based metal coating bath. The weight of molten metal passing through a micro-filter was measured at constant pressure and temperature using a Prefil-Footprinter, a portable inclusion analyser. Fundamental cake filtration theory was applied to analyse Prefil data. Inverse average filtration rate (t/V) and dt/dV was plotted as a function of cumulative filtrate vol-ume (V ) to generate filtrations curves. Cake mode filtration parameters were determined from linearized plots of a constant pressure filtration equation (t/V=μαavC----------------2A2ΔP+μRm/APΔ) The linear diagram in the dt/dV form was used to assess deviations due to secondary effects. The IMC mass captured/unit volume of filtrate was calculated based on chemical analysis of the filter cake and standard cake mode filtration parameters. Detailed microstructural analysis was carried out to characterize the nature of IMCs captured in the filter cake. Fundamental cake fil- tration theory together with microstructural analysis of the filter cake can provide a quantitative measure for lev- els of IMCs present in the bath and overall metal cleanliness of the coating bath.
참고문헌 (10)
- P. G. Enright, "A Shop Floor Technique for Quantitative Measurement of Molten Metal Cleanliness of Aluminium Alloys", Foundryman Magazine, pp.390~395 (1996), IBF Publications
- S. W. Hudson, "Inclusion Detection in Molten Aluminium Alloys", International Journal of Metalcasting, 10, pp.289~ (2016)[DOI]
- N. Setargew, "Detection of Dross Intermetallic Compound Particles in 55%Al-Zn Melt Using LAIS", InterZAC2004, pp.1~16 (2004)
- X. Cao, "Filtration Resistance During Pressure Filtration Tests of Liquid Aluminium Alloys", International Journal of Materials Research, 97, pp.1163~ (2006)[DOI]
- T. A. Engh, "Principles of Metal Refining", pp.253~ (1992), Oxford University Press
- M. Hennemann, "Influence of particle size uniformity on the filter cake resistance of physically and chemically modified fine particles", Separation and Purification Technology, 272, pp.118966~ (2021)[DOI]
- A. M. Samuel, "Inclusion Measurement in Al-Si Foundry Alloys Using Qualiflash and Prefil Filtration Techniques", International Journal of Metalcasting, 12, pp.625~ (2018)[DOI]
- N. Setargew, , Proc. 12th Int. Conf. on Zinc & Zinc Alloy Coated Steel Sheet (Galvatech 2021), pp.1292~1301 (2021), Voestalpine Stahl GmbH
- S. Ripperger, "Fundamentals Ullmann’s Encyclopaedia of Industrial Chemistry, 14", pp.678~ (2012)
- "VDI 2762 Part 2, German Standard, Mechanical Solid Liquid Separation, GVC" (2010)[URL]