Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys

Markley, T. A., Mardel, J. I., Hughes, A. E., Hinton, B. R. W., Glenn, A. M. and Forsyth, M. 2011, Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys, Materials and corrosion, vol. 62, no. 9, pp. 836-840.

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Title Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys
Author(s) Markley, T. A.
Mardel, J. I.
Hughes, A. E.
Hinton, B. R. W.ORCID iD for Hinton, B. R. W.
Glenn, A. M.
Forsyth, M.ORCID iD for Forsyth, M.
Journal name Materials and corrosion
Volume number 62
Issue number 9
Start page 836
End page 840
Total pages 5
Publisher Wiley - VCH Verlag GmbH & Co. KGaA
Place of publication Berlin, Germany
Publication date 2011-09
ISSN 0947-5117
Keyword(s) aluminium alloys
filiform corrosion
Summary Mixed rare earth organophosphates have been investigated as potential corrosion inhibitors for AA2024-T3 with the aim of replacing chromate-based technologies. Cerium diphenyl phosphate (Ce(dpp) 3) and mischmetal diphenyl phosphate (Mm(dpp) 3) were added to epoxy coatings applied to AA2024-T3 panels and they were effective in reducing the amount and rate of filiform corrosion in high humidity conditions. Ce(dpp) 3 was the most effective and characterisation of the coating formulations showed approximately a factor of 5 reduction in both the number of corrosion filaments initiated as well as the length of these. Mm(dpp) 3 appeared to reduce the corrosion growth rate by a factor of 2 although it was the more effective inhibitor in solution studies. Spectroscopic characterisation of the coatings indicated that the cerium based inhibitor may disrupt network formation in the epoxy thus resulting in a coating that absorbed more water and allowed greater solubilisation of the corrosion inhibiting compound.
Language eng
Field of Research 091207 Metals and Alloy Materials
091205 Functional Materials
Socio Economic Objective 870302 Metals (e.g. Composites, Coatings, Bonding)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, WILEY-VCH Verlag GmbH & Co. KGaA
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