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A non-contact method for measuring temperature changes due to gas wiping of Zn alloy coatings produced on a continuous galvanising line
,
David Penney ,
Sam Reis,
Anthony Lewis,
James Sullivan ,
Oliver Newton-Coombs,
Clive Challinor ,
Peter Holliman
Results in Engineering, Volume: 30, Start page: 110447
Swansea University Authors:
Stuart Cairns , David Penney , Sam Reis, Anthony Lewis, James Sullivan , Peter Holliman
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DOI (Published version): 10.1016/j.rineng.2026.110447
Abstract
Operando style, non-contact infrared thermography has been used to study the change in surface metal temperature between the zinc bath compared to just above the gas jet knives at an industrial, continuous galvanising line (CGL). Measuring photons in the wavelength range 7–12 μm at 30 frames per sec...
| Published in: | Results in Engineering |
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| ISSN: | 2590-1230 |
| Published: |
Elsevier BV
2026
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa71724 |
| Abstract: |
Operando style, non-contact infrared thermography has been used to study the change in surface metal temperature between the zinc bath compared to just above the gas jet knives at an industrial, continuous galvanising line (CGL). Measuring photons in the wavelength range 7–12 μm at 30 frames per second (fps), the change in photon count was 4608. Using an emissivity of 0.069, corresponding to zinc, this correlates to a minimum temperature drop of 14 °C. Using higher emissivities, linked with oxidized surfaces, suggests an even higher temperature drop (up to 19 °C). These data are key in understanding the influence of coating weight processing parameters on continuously galvanised sheet steel with implications for surface finish, microstructural morphology and resultant corrosion resistance of the material. The infrared data is validated using static measurements of molten zinc and zinc dross between 430 °C and 470 °C in a hot dip galvaniser simulation pot containing 40 kg of molten GI (Zn 0.2 wt. %Al). |
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| Keywords: |
Thermography; Continuous galvanising line; Gas wiping; Emissivity; Galvanised coating |
| College: |
Faculty of Science and Engineering |
| Funders: |
We gratefully thank EPSRC and Tata Steel for cosponsoring an iCASE PhD studentship (Voucher no 20000176) for SR, EPSRC for funding the Sustain Hub (EP/S018107/1) for PJH and AL. The FLIR thermal camera was funded through WEFO funding for IMPACT (Green Recovery). |
| Start Page: |
110447 |