High frequency pulse anodising of recycled 5006 aluminium alloy for optimised decorative appearance

Flemming Jensen*, Ib Kongstad, Kai Dirscherl, Visweswara Chakravarthy Gudla, Rajan Ambat

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

High frequency (HF) pulse anodising of a recycled AA5006 Aluminium alloy has been investigated to understand the effect of pulse anodising on improvements in optical quality of anodised surfaces in a sulphuric acid bath. The investigation includes the effect of applied voltage and pulse frequency on the anodising kinetics and optical properties of the recycled alloy with high number of intermetallic phases. The effect is compared with anodised surfaces produced using conventional DC anodising. Both the anodising kinetics and optical properties are largely dependent on the applied pulse frequency and amplitude of the anodising voltage. Surface gloss of the layer is generally improved upon using pulses compared to DC and improved by lowering the anodising voltage and increasing the pulse frequency. Improved kinetics under pulse mode allows for getting good anodic layers even with voltage levels lower than 10 V, however the surface gloss worsens when anodising below 10 V. The benefit from pulse anodising is found to be largely due to metal-oxide interface roughness rather than on the structure and composition of the anodised layer.
Original languageEnglish
JournalSurface and Coatings Technology
Volume368
Pages (from-to)42-50
ISSN0257-8972
DOIs
Publication statusPublished - 2019

Keywords

  • Recycled aluminium
  • AA5006
  • Pulse anodising
  • High frequency
  • Optical appearance
  • Kinetics

Cite this

Jensen, Flemming ; Kongstad, Ib ; Dirscherl, Kai ; Gudla, Visweswara Chakravarthy ; Ambat, Rajan. / High frequency pulse anodising of recycled 5006 aluminium alloy for optimised decorative appearance. In: Surface and Coatings Technology. 2019 ; Vol. 368. pp. 42-50.
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title = "High frequency pulse anodising of recycled 5006 aluminium alloy for optimised decorative appearance",
abstract = "High frequency (HF) pulse anodising of a recycled AA5006 Aluminium alloy has been investigated to understand the effect of pulse anodising on improvements in optical quality of anodised surfaces in a sulphuric acid bath. The investigation includes the effect of applied voltage and pulse frequency on the anodising kinetics and optical properties of the recycled alloy with high number of intermetallic phases. The effect is compared with anodised surfaces produced using conventional DC anodising. Both the anodising kinetics and optical properties are largely dependent on the applied pulse frequency and amplitude of the anodising voltage. Surface gloss of the layer is generally improved upon using pulses compared to DC and improved by lowering the anodising voltage and increasing the pulse frequency. Improved kinetics under pulse mode allows for getting good anodic layers even with voltage levels lower than 10 V, however the surface gloss worsens when anodising below 10 V. The benefit from pulse anodising is found to be largely due to metal-oxide interface roughness rather than on the structure and composition of the anodised layer.",
keywords = "Recycled aluminium, AA5006, Pulse anodising, High frequency, Optical appearance, Kinetics",
author = "Flemming Jensen and Ib Kongstad and Kai Dirscherl and Gudla, {Visweswara Chakravarthy} and Rajan Ambat",
year = "2019",
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language = "English",
volume = "368",
pages = "42--50",
journal = "Surface and Coatings Technology",
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High frequency pulse anodising of recycled 5006 aluminium alloy for optimised decorative appearance. / Jensen, Flemming; Kongstad, Ib; Dirscherl, Kai; Gudla, Visweswara Chakravarthy; Ambat, Rajan.

In: Surface and Coatings Technology, Vol. 368, 2019, p. 42-50.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - High frequency pulse anodising of recycled 5006 aluminium alloy for optimised decorative appearance

AU - Jensen, Flemming

AU - Kongstad, Ib

AU - Dirscherl, Kai

AU - Gudla, Visweswara Chakravarthy

AU - Ambat, Rajan

PY - 2019

Y1 - 2019

N2 - High frequency (HF) pulse anodising of a recycled AA5006 Aluminium alloy has been investigated to understand the effect of pulse anodising on improvements in optical quality of anodised surfaces in a sulphuric acid bath. The investigation includes the effect of applied voltage and pulse frequency on the anodising kinetics and optical properties of the recycled alloy with high number of intermetallic phases. The effect is compared with anodised surfaces produced using conventional DC anodising. Both the anodising kinetics and optical properties are largely dependent on the applied pulse frequency and amplitude of the anodising voltage. Surface gloss of the layer is generally improved upon using pulses compared to DC and improved by lowering the anodising voltage and increasing the pulse frequency. Improved kinetics under pulse mode allows for getting good anodic layers even with voltage levels lower than 10 V, however the surface gloss worsens when anodising below 10 V. The benefit from pulse anodising is found to be largely due to metal-oxide interface roughness rather than on the structure and composition of the anodised layer.

AB - High frequency (HF) pulse anodising of a recycled AA5006 Aluminium alloy has been investigated to understand the effect of pulse anodising on improvements in optical quality of anodised surfaces in a sulphuric acid bath. The investigation includes the effect of applied voltage and pulse frequency on the anodising kinetics and optical properties of the recycled alloy with high number of intermetallic phases. The effect is compared with anodised surfaces produced using conventional DC anodising. Both the anodising kinetics and optical properties are largely dependent on the applied pulse frequency and amplitude of the anodising voltage. Surface gloss of the layer is generally improved upon using pulses compared to DC and improved by lowering the anodising voltage and increasing the pulse frequency. Improved kinetics under pulse mode allows for getting good anodic layers even with voltage levels lower than 10 V, however the surface gloss worsens when anodising below 10 V. The benefit from pulse anodising is found to be largely due to metal-oxide interface roughness rather than on the structure and composition of the anodised layer.

KW - Recycled aluminium

KW - AA5006

KW - Pulse anodising

KW - High frequency

KW - Optical appearance

KW - Kinetics

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EP - 50

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -