The effect of treatment time on the ionic liquid surface film formation: promising surface coating for Mg alloy AZ31

Zhang, Yafei, Liu, Xiao, Jamal, Sina S., Hinton, Bruce R.W., Moulton, Simon E., Wallace, Gordon G. and Forsyth, Maria 2016, The effect of treatment time on the ionic liquid surface film formation: promising surface coating for Mg alloy AZ31, Surface and coatings technology, vol. 296, pp. 192-202, doi: 10.1016/j.surfcoat.2016.04.038.

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Title The effect of treatment time on the ionic liquid surface film formation: promising surface coating for Mg alloy AZ31
Author(s) Zhang, Yafei
Liu, Xiao
Jamal, Sina S.
Hinton, Bruce R.W.ORCID iD for Hinton, Bruce R.W.
Moulton, Simon E.
Wallace, Gordon G.
Forsyth, MariaORCID iD for Forsyth, Maria
Journal name Surface and coatings technology
Volume number 296
Start page 192
End page 202
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-06-25
ISSN 0257-8972
Keyword(s) Science & Technology
Physical Sciences
Materials Science, Coatings & Films
Physics, Applied
Materials Science
Biodegradable magnesium implants
Surface coating
Ionic liquid
Summary Mg alloys are attractive materials for medical devices. The main limitation is that they are prone to corrosion. A low toxicity surface coating that enables uniform, controlled corrosion at a desired rate (this usually means it must offer barrier functions for a limited time period) is desirable. Phosphate-based ionic liquids (ILs) are known to induce a coating that can reduce the corrosion rate of Mg alloys, Furthermore, some ILs are known to be biocompatible and therefore, controlling the corrosion behaviour of an Mg alloy and its surface biocompatibility can be achieved through adding an appropriate low toxic IL surface layer to the substrate. In this study, we have evaluated the cytotoxicity of three phosphate-based ILs to primary human coronary artery endothelial cells. Among them, tributyl(methyl)-phosphonium diphenylphosphate (P1,4,4,4dpp) shows the lowest cytotoxicity. Therefore, further work was aimed at developing an appropriate treatment method to produce a homogeneous and passive surface coating based on P1,4,4,4dpp IL, with the focus on investigating the effect of treatment time. The results showed that that the formation of IL coating on AZ31 has proceeded progressively, and treatment time plays an important role. An IL treatment at 100 °C with an extended treatment time of 5 h significantly enhanced corrosion resistance of the AZ31 alloy in simulated body fluid. Additionally, the corrosion morphology was uniform and there was no evidence of "localized pitting corrosion" observed. Such a performance makes this ionic liquid coating as a potential surface coating biodegradable Mg-based implants.
Language eng
DOI 10.1016/j.surfcoat.2016.04.038
Field of Research 030604 Electrochemistry
091299 Materials Engineering not elsewhere classified
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
0204 Condensed Matter Physics
Socio Economic Objective 920103 Cardiovascular System and Diseases
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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