Electrochemical etching of aluminium alloy in ionic liquids

P. Huang, P. C. Howlett, D. R. Macfarlane, M. Forsyth

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

AA5083 aluminium alloy has been shown to be partially passivated by a 2-step anodic pre-treatment in Trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)amide ([P6,6,6,14][NTf2]) ionic liquid. Surface characterisation revealed that an electrochemical etching process had occurred, comparable to acid etching of aluminium. Scanning electron microscopy/energy dispersive x-ray spectroscopy results have established that magnesium dealloyed from the Mg2Si intermetallic particles and metal fluorides were deposited onto the remaining Mg2Si sites, which subsequently led to decreased anodic corrosion kinetics (to one third of the control) as well as an increase in the corrosion and pitting potentials. This unique electrochemical etching process offers a simple and quick method to improve the corrosion resistance of an aluminium alloy as it leads to a more uniform surface, in terms of defect size and distribution, compared to conventional acid etching. This process has the potential to be used as a pre-treatment to inhibit corrosion of AA5083 alloy.

Original languageEnglish
Title of host publicationAnnual Conference of the Australasian Corrosion Association 2012
Place of PublicationKerrimuir VIC Australia
PublisherAustralasian Corrosion Association
Pages595-603
Number of pages9
ISBN (Print)9781622769698
Publication statusPublished - 2012
EventAustralasian Corrosion Association (ACA) Conference 2012: Corrosion and Prevention - Crown Conference Centre, Melbourne, Australia
Duration: 11 Nov 201214 Nov 2012

Conference

ConferenceAustralasian Corrosion Association (ACA) Conference 2012
Abbreviated titleACA 2012
CountryAustralia
CityMelbourne
Period11/11/1214/11/12
OtherCorrosion Management for a Sustainable World: Transport, Energy, Mining, Life Extension and Modelling

Keywords

  • Alluminium alloys
  • Anodic passivation
  • Corrosion
  • Electrochemical etching
  • Ionic liquids
  • Surface characterisation

Cite this

Huang, P., Howlett, P. C., Macfarlane, D. R., & Forsyth, M. (2012). Electrochemical etching of aluminium alloy in ionic liquids. In Annual Conference of the Australasian Corrosion Association 2012 (pp. 595-603). [104] Kerrimuir VIC Australia: Australasian Corrosion Association.
Huang, P. ; Howlett, P. C. ; Macfarlane, D. R. ; Forsyth, M. / Electrochemical etching of aluminium alloy in ionic liquids. Annual Conference of the Australasian Corrosion Association 2012. Kerrimuir VIC Australia : Australasian Corrosion Association, 2012. pp. 595-603
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Huang, P, Howlett, PC, Macfarlane, DR & Forsyth, M 2012, Electrochemical etching of aluminium alloy in ionic liquids. in Annual Conference of the Australasian Corrosion Association 2012., 104, Australasian Corrosion Association, Kerrimuir VIC Australia, pp. 595-603, Australasian Corrosion Association (ACA) Conference 2012, Melbourne, Australia, 11/11/12.

Electrochemical etching of aluminium alloy in ionic liquids. / Huang, P.; Howlett, P. C.; Macfarlane, D. R.; Forsyth, M.

Annual Conference of the Australasian Corrosion Association 2012. Kerrimuir VIC Australia : Australasian Corrosion Association, 2012. p. 595-603 104.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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N2 - AA5083 aluminium alloy has been shown to be partially passivated by a 2-step anodic pre-treatment in Trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)amide ([P6,6,6,14][NTf2]) ionic liquid. Surface characterisation revealed that an electrochemical etching process had occurred, comparable to acid etching of aluminium. Scanning electron microscopy/energy dispersive x-ray spectroscopy results have established that magnesium dealloyed from the Mg2Si intermetallic particles and metal fluorides were deposited onto the remaining Mg2Si sites, which subsequently led to decreased anodic corrosion kinetics (to one third of the control) as well as an increase in the corrosion and pitting potentials. This unique electrochemical etching process offers a simple and quick method to improve the corrosion resistance of an aluminium alloy as it leads to a more uniform surface, in terms of defect size and distribution, compared to conventional acid etching. This process has the potential to be used as a pre-treatment to inhibit corrosion of AA5083 alloy.

AB - AA5083 aluminium alloy has been shown to be partially passivated by a 2-step anodic pre-treatment in Trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)amide ([P6,6,6,14][NTf2]) ionic liquid. Surface characterisation revealed that an electrochemical etching process had occurred, comparable to acid etching of aluminium. Scanning electron microscopy/energy dispersive x-ray spectroscopy results have established that magnesium dealloyed from the Mg2Si intermetallic particles and metal fluorides were deposited onto the remaining Mg2Si sites, which subsequently led to decreased anodic corrosion kinetics (to one third of the control) as well as an increase in the corrosion and pitting potentials. This unique electrochemical etching process offers a simple and quick method to improve the corrosion resistance of an aluminium alloy as it leads to a more uniform surface, in terms of defect size and distribution, compared to conventional acid etching. This process has the potential to be used as a pre-treatment to inhibit corrosion of AA5083 alloy.

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Huang P, Howlett PC, Macfarlane DR, Forsyth M. Electrochemical etching of aluminium alloy in ionic liquids. In Annual Conference of the Australasian Corrosion Association 2012. Kerrimuir VIC Australia: Australasian Corrosion Association. 2012. p. 595-603. 104