Conversion coatings of Mg-alloy AZ91D using trihexyl(tetradecyl) phosphonium bis(trifluoromethanesulfonyl)amide ionic liquid

Howlett, P.C., Gramet, S., Lin, J., Efthimiadis, J., Chen, X.B., Birbilis, N. and Forsyth, M. 2012, Conversion coatings of Mg-alloy AZ91D using trihexyl(tetradecyl) phosphonium bis(trifluoromethanesulfonyl)amide ionic liquid, Science China chemistry, vol. 55, no. 8, pp. 1598-1607.

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Title Conversion coatings of Mg-alloy AZ91D using trihexyl(tetradecyl) phosphonium bis(trifluoromethanesulfonyl)amide ionic liquid
Author(s) Howlett, P.C.
Gramet, S.
Lin, J.
Efthimiadis, J.
Chen, X.B.
Birbilis, N.
Forsyth, M.
Journal name Science China chemistry
Volume number 55
Issue number 8
Start page 1598
End page 1607
Total pages 10
Publisher Springer
Place of publication Berlin, Germany
Publication date 2012-08
ISSN 1674-7291
1869-1870
Keyword(s) AZ91D
conversion coating
corrosion
ionic liquid
pretreatment
Summary This work reveals the performance of a trihexyl(tetradecyl)phosphonium bis(trifluoromethanesulfonyl)amide ([P6,6,6,14][NTf2]) ionic liquid (IL) conversion coating upon AZ91D. Such conversion coatings represent a novel avenue for chromate replacement. An optimization of coating performance was pursued by careful alloy pretreatment to generate a surface on which the coating performs best, as the AZ91 substrate is distinctly different from pure or dilute Mg alloys. The results reveal that a functional conversion coating can be achieved, retarding anodic dissolution kinetics, causing a significant decrease in corrosion rate. The coating efficacy is closely tied to the pretreatment performed, which dictates both the microstructural and electrochemical heterogeneity of the surface. The resulting coatings were found to contain MgxFx and phosphonium cation related components, the proportions of which were dependent on the pretreatment.
Language eng
Field of Research 091207 Metals and Alloy Materials
030604 Electrochemistry
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30051178

Document type: Journal Article
Collection: Institute for Frontier Materials
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