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Electrochemical etching of aluminium alloy in ionic liquids

conference contribution
posted on 01.01.2012, 00:00 authored by Peipei Huang, Patrick HowlettPatrick Howlett, D MacFarlane, Maria ForsythMaria Forsyth
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.

History

Event

Australasian Corrosion Association. Conference (2012 : Melbourne, Victoria)

Pagination

1 - 9

Publisher

Australasian Corrosion Association

Location

Melbourne, Victoria

Place of publication

[Melbourne, Vic.]

Start date

11/11/2012

End date

14/11/2012

ISBN-13

9781622769698

Language

eng

Publication classification

E1 Full written paper - refereed

Title of proceedings

ACA Corrosion & Prevention 2012 : Proceedings of the Annual Australasian Corrosion Association Conference