Appearance of anodised aluminium: Effect of alloy composition and prior surface finish

Martin Aggerbeck, Stela Canulescu, Kai Dirscherl, Villads Egede Johansen, Sara Lena Josefin Engberg, Jørgen Schou, Rajan Ambat

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Effect of alloy composition and prior surface finish on the optical appearance of the anodised layer on aluminium alloys was investigated. Four commercial alloys namely AA1050, Peraluman 706, AA5754, and AA6082 were used for the investigation. Microstructure and surface morphology of the substrate prior to anodising were analysed using scanning electron microscopy and atomic force microscopy. The optical appearance of the anodised surface with and without sealing was investigated using a photography setup, photospectrometry and bidirectional reflectance distribution function. It was found that the roughness of the as-etched surface increases with the degree of alloying due to second phase particles making the reflection more diffused, and that the as-etched surface morphology is similar to the oxide–substrate interface after anodising. Proper polishing is achieved on hard alloys and the glossy appearance was kept for alloys of high purity. Sealing made the specular reflection of the mechanically polished specimens more distinct.
Original languageEnglish
JournalSurface and Coatings Technology
Volume254
Pages (from-to)28-41
ISSN0257-8972
DOIs
Publication statusPublished - 2014

Keywords

  • Aluminium
  • Appearance
  • Etching
  • Polishing
  • Alloy composition
  • BRDF

Cite this

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title = "Appearance of anodised aluminium: Effect of alloy composition and prior surface finish",
abstract = "Effect of alloy composition and prior surface finish on the optical appearance of the anodised layer on aluminium alloys was investigated. Four commercial alloys namely AA1050, Peraluman 706, AA5754, and AA6082 were used for the investigation. Microstructure and surface morphology of the substrate prior to anodising were analysed using scanning electron microscopy and atomic force microscopy. The optical appearance of the anodised surface with and without sealing was investigated using a photography setup, photospectrometry and bidirectional reflectance distribution function. It was found that the roughness of the as-etched surface increases with the degree of alloying due to second phase particles making the reflection more diffused, and that the as-etched surface morphology is similar to the oxide–substrate interface after anodising. Proper polishing is achieved on hard alloys and the glossy appearance was kept for alloys of high purity. Sealing made the specular reflection of the mechanically polished specimens more distinct.",
keywords = "Aluminium, Appearance, Etching, Polishing, Alloy composition, BRDF",
author = "Martin Aggerbeck and Stela Canulescu and Kai Dirscherl and Johansen, {Villads Egede} and Engberg, {Sara Lena Josefin} and J{\o}rgen Schou and Rajan Ambat",
year = "2014",
doi = "10.1016/j.surfcoat.2014.05.047",
language = "English",
volume = "254",
pages = "28--41",
journal = "Surface and Coatings Technology",
issn = "0257-8972",
publisher = "Elsevier",

}

Appearance of anodised aluminium: Effect of alloy composition and prior surface finish. / Aggerbeck, Martin; Canulescu, Stela; Dirscherl, Kai; Johansen, Villads Egede; Engberg, Sara Lena Josefin; Schou, Jørgen; Ambat, Rajan.

In: Surface and Coatings Technology, Vol. 254, 2014, p. 28-41.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Appearance of anodised aluminium: Effect of alloy composition and prior surface finish

AU - Aggerbeck, Martin

AU - Canulescu, Stela

AU - Dirscherl, Kai

AU - Johansen, Villads Egede

AU - Engberg, Sara Lena Josefin

AU - Schou, Jørgen

AU - Ambat, Rajan

PY - 2014

Y1 - 2014

N2 - Effect of alloy composition and prior surface finish on the optical appearance of the anodised layer on aluminium alloys was investigated. Four commercial alloys namely AA1050, Peraluman 706, AA5754, and AA6082 were used for the investigation. Microstructure and surface morphology of the substrate prior to anodising were analysed using scanning electron microscopy and atomic force microscopy. The optical appearance of the anodised surface with and without sealing was investigated using a photography setup, photospectrometry and bidirectional reflectance distribution function. It was found that the roughness of the as-etched surface increases with the degree of alloying due to second phase particles making the reflection more diffused, and that the as-etched surface morphology is similar to the oxide–substrate interface after anodising. Proper polishing is achieved on hard alloys and the glossy appearance was kept for alloys of high purity. Sealing made the specular reflection of the mechanically polished specimens more distinct.

AB - Effect of alloy composition and prior surface finish on the optical appearance of the anodised layer on aluminium alloys was investigated. Four commercial alloys namely AA1050, Peraluman 706, AA5754, and AA6082 were used for the investigation. Microstructure and surface morphology of the substrate prior to anodising were analysed using scanning electron microscopy and atomic force microscopy. The optical appearance of the anodised surface with and without sealing was investigated using a photography setup, photospectrometry and bidirectional reflectance distribution function. It was found that the roughness of the as-etched surface increases with the degree of alloying due to second phase particles making the reflection more diffused, and that the as-etched surface morphology is similar to the oxide–substrate interface after anodising. Proper polishing is achieved on hard alloys and the glossy appearance was kept for alloys of high purity. Sealing made the specular reflection of the mechanically polished specimens more distinct.

KW - Aluminium

KW - Appearance

KW - Etching

KW - Polishing

KW - Alloy composition

KW - BRDF

U2 - 10.1016/j.surfcoat.2014.05.047

DO - 10.1016/j.surfcoat.2014.05.047

M3 - Journal article

VL - 254

SP - 28

EP - 41

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -