Electrochemical etching of aluminium alloy in ionic liquids

Huang, P., Howlett, P. C., MacFarlane, D.R. and Forsyth, M. 2012, Electrochemical etching of aluminium alloy in ionic liquids, in ACA Corrosion & Prevention 2012 : Proceedings of the Annual Australasian Corrosion Association Conference, Australasian Corrosion Association, [Melbourne, Vic.], pp. 1-9.

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Title Electrochemical etching of aluminium alloy in ionic liquids
Author(s) Huang, P.
Howlett, P. C.
MacFarlane, D.R.
Forsyth, M.
Conference name Australasian Corrosion Association. Conference (2012 : Melbourne, Victoria)
Conference location Melbourne, Victoria
Conference dates 11-14 Nov. 2012
Title of proceedings ACA Corrosion & Prevention 2012 : Proceedings of the Annual Australasian Corrosion Association Conference
Editor(s) [Unknown]
Publication date 2012
Conference series Australasian Corrosion Association Conference
Start page 1
End page 9
Total pages 9
Publisher Australasian Corrosion Association
Place of publication [Melbourne, Vic.]
Keyword(s) aluminium alloys
ionic liquids
anodic passivation
electrochemical etching
surface characterisation
corrosion
Summary 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.
ISBN 9781622769698
Language eng
Field of Research 091207 Metals and Alloy Materials
030604 Electrochemistry
Socio Economic Objective 870302 Metals (e.g. Composites, Coatings, Bonding)
HERDC Research category E1 Full written paper - refereed
Persistent URL http://hdl.handle.net/10536/DRO/DU:30052870

Document type: Conference Paper
Collection: Institute for Frontier Materials
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