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Title Optacial Appearance of Aluminium
Author Aggerbeck, Martin
Supervisor Ambat, Rajan (Materials Science and Engineering, Department of Mechanical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Lenau, Torben Anker (Innovation and Sustainability, Department of Management Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2010
Abstract Three commercial aluminium alloys (1050, 5754 and 6082), with different surface treatments (combinations of etching and polishing) has been investigated by LOM, GDOES and photospectrometry, to study how and why alloy composition and surface treatment affects the optical appearance of an Al specimen. It is found that reflection colour is alloy dependent and reflection intensity depends on both surface treatment and alloy purity. Studies have shown that a specimen with high surface roughness caused by water polishing turns black during anodising. Introductory experiments have been made with PVD coatings of Al and Ti on cast Al to investigate, the connection between Ti-concentration and optical appearance. Problems occurring when anodising the coatings have initiated examinations of the coatings by LOM, SEM and XRD. A few photospectrometry measurements have been done on the non-anodised PVD coatings. Ongoing experiments of a watermark under the anodised layer and a mokumé gane product have been initiated.
Imprint Technical University of Denmark (DTU) : Kgs. Lyngby, Denmark
Pages 90
Fulltext
Original PDF Martin_Aggerbeck_Optical_Appearance_of_Aluminium.pdf (13.81 MB)
Admin Creation date: 2010-11-29    Update date: 2011-01-17    Source: dtu    ID: 270468    Original MXD