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Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys / T. A. Markley in Materials and corrosion, Vol. 62 N° 9 (Septembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 9 (Septembre 2011) . - pp. 836–840 Titre : Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys Type de document : texte imprimé Auteurs : T. A. Markley, Auteur ; J. I. Mardel, Auteur ; A. E. Hughes, Auteur Année de publication : 2011 Article en page(s) : pp. 836–840 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Aluminium  alloys  Coatings  Filiform  corrosion  Inhibition Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : 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. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905597/abstract [article] Chromate replacement in coatings for corrosion protection of aerospace aluminium alloys [texte imprimé] / T. A. Markley, Auteur ; J. I. Mardel, Auteur ; A. E. Hughes, Auteur . - 2011 . - pp. 836–840. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 9 (Septembre 2011) . - pp. 836–840 Mots-clés : Aluminium  alloys  Coatings  Filiform  corrosion  Inhibition Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : 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. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905597/abstract