Inspection of Trivalent Chromium Conversion Coatings Using Laser Light: The Unexpected Role of Interference on Cold-Rolled Aluminium

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dc.creatorRischmueller, Joerg-
dc.creatorToschke, Yannic-
dc.creatorImlau, Mirco-
dc.creatorSchlag, Mareike-
dc.creatorBrüning, Hauke-
dc.creatorBrune, Kai-
dc.date.accessioned2021-05-11T09:49:41Z-
dc.date.available2021-05-11T09:49:41Z-
dc.date.issued2020-04-11-
dc.identifier.citationRischmueller, Joerg; Toschke, Yannic; Imlau, Mirco; Schlag, Mareike; Brüning, Hauke; Brune, Kai. 2020. "Inspection of Trivalent Chromium Conversion Coatings Using Laser Light: The Unexpected Role of Interference on Cold-Rolled Aluminium" Sensors 20, no. 8: 2164.ger
dc.identifier.urihttps://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-202105114474-
dc.description.abstractLaser-based inspection of trivalent chromium conversion coatings on rough, cold-rolled aluminium substrates is studied from a basic physics perspective by means of angle and wavelength dependent measurements. As a result, we show that the correlation between the scattered laser light and the coating weight of the conversion layer is dominated by the phenomenon of interference. The combined experimental and numerical approach of our study is based on an appropriate layer model which was developed from a set of reference measurements of confocal microscopy, electron microscopy and X-ray photoelectron spectroscopy. The aluminium alloy AA3003 with a trivalent chromium conversion coating serves as an example. Our derived model is capable to reconstruct the reflectance of a laser beam at grazing incidence even for a pronounced surface roughness of Rq≈300 nm , for different coating thicknesses less than 70 n m corresponding to coating weights between zero and 0.5 g / m 2 and for laser wavelengths from 405 n m to 785 n m . In our discussion we outline the possibility to transfer the results to other aluminium alloys and/or other metallic substrates, as well as their potential for industrial applications such as 100% inline-capability, costs, velocity and ruggedness.eng
dc.relationhttps://doi.org/10.3390/s20082164ger
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectlaser-based inspectioneng
dc.subjectinterferenceeng
dc.subjectlayer modeleng
dc.subjecttrivalent chromium conversion coatingeng
dc.subjectcold-rolled aluminiumeng
dc.subjectrough surfaceeng
dc.subjectAA3003eng
dc.subject.ddc530 - Physikger
dc.titleInspection of Trivalent Chromium Conversion Coatings Using Laser Light: The Unexpected Role of Interference on Cold-Rolled Aluminiumeng
dc.typeEinzelbeitrag in einer wissenschaftlichen Zeitschrift [article]ger
orcid.creatorhttps://orcid.org/0000-0002-7009-372X-
orcid.creatorhttps://orcid.org/0000-0002-5343-5636-
dc.identifier.doi10.3390/s20082164-
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