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Film formation in trihexyl(tetradecyl)phosphonium diphenylphosphate ([P6,6,6,14][dpp]) ionic liquid on AA5083 aluminium alloy

Huang, Peipei, Somers, Anthony, Howlett, Patrick C. and Forsyth, Maria 2016, Film formation in trihexyl(tetradecyl)phosphonium diphenylphosphate ([P6,6,6,14][dpp]) ionic liquid on AA5083 aluminium alloy, Surface and coatings technology, vol. 303, pp. 385-395, doi: 10.1016/j.surfcoat.2015.12.060.

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Title Film formation in trihexyl(tetradecyl)phosphonium diphenylphosphate ([P6,6,6,14][dpp]) ionic liquid on AA5083 aluminium alloy
Formatted title  Film formation in trihexyl(tetradecyl)phosphonium diphenylphosphate
([P6,6,6,14][dpp]) ionic liquid on AA5083 aluminium alloy
Author(s) Huang, Peipei
Somers, Anthony
Howlett, Patrick C.ORCID iD for Howlett, Patrick C. orcid.org/0000-0002-2151-2932
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Surface and coatings technology
Volume number 303
Start page 385
End page 395
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-10-15
ISSN 0257-8972
1879-3347
Keyword(s) aluminium alloys
ionic alloys
film formation
anodising
corrosion
Summary Whilst ionic liquids (IL) have been shown to inhibit corrosion on some reactive metals and alloys by forming a surface film, e.g. Li and Mg, understanding of the interaction between ionic liquids and aluminium is lacking. This research study investigated the viability of film formation on AA5083 Aluminium Alloy by electrochemical treatments in the trihexyl(tetradecyl)phosphonium diphenylphosphate ([P6,6,6,14][dpp]) IL. Two-step anodic treatments were performed on AA5083 in the IL, followed by a comparison of the corrosion behaviour of the IL-treated samples with that of a control. It has been revealed that the two-step IL-treatment led to reduced current densities on AA5083 under cyclic voltammetry scan in the IL before and after the IL-treatment. Lower corrosion rates have been shown on all samples treated in IL at room temperature. Surface characterisation showed a non-uniform porous film on the 50°C IL-treated sample with a film thickness ranging between 37nm and 155nm. The IL-film enhanced the corrosion resistance of AA5083 by protecting the Al-matrix and Fe-rich intermetallic particles (IMPs). Although findings of this study suggest similar IL-film formation as that on Li and Mg, more research needs to be conducted to optimise the electrochemical treatment conditions and ultimately to develop a robust IL-film formation procedure for corrosion protection.
Language eng
DOI 10.1016/j.surfcoat.2015.12.060
Field of Research 091207 Metals and Alloy Materials
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
0204 Condensed Matter Physics
Socio Economic Objective 870302 Metals (e.g. Composites
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID DP0986205
Copyright notice ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081111

Document type: Journal Article
Collection: Institute for Frontier Materials
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