Emeraldine base as corrosion protective layer on aluminium alloy AA5182, effect of the surface microstructure

Publication: Research - peer-reviewJournal article – Annual report year: 2007

  • Author: Cecchetto, L

    Laboratoire d’Electrochimie et de Physicochimie des Matériaux et des Interfaces

  • Author: Ambat, Rajan

    Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark, Produktionstorvet, 2800, Kgs. Lyngby, Denmark

  • Author: Davenport, A.J.

    University of Birmingham

  • Author: Delabouglise, D

    Laboratoire d’Electrochimie et de Physicochimie des Matériaux et des Interfaces

  • Author: Petit, J.-P.

    Laboratoire d’Electrochimie et de Physicochimie des Matériaux et des Interfaces

  • Author: Neel, O.

    Parc économic Centr' Alp, Pechiney

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AA5182 aluminium alloy cold rolled samples were coated by thin Wlms of emeraldine base (EB) obtained from a 5% solution in N-methylpyrrolidinone. Accelerated corrosion tests prove this coating very eVective for corrosion protection of aluminium alloys in neutral environment. This study underlines the prominent role of surface cathodic intermetallic particles in pit initiation and coating break down in enhanced corrosion conditions and suggest that, beside the EB barrier properties, the enhanced corrosion resistance observed on the EB coated samples could partly arise from two other mains factors: • a weak redox activity of the polymer which passivate the metal, • a proton involving self-healing process taking place at the polymer–metal interface, which contributes to delay local acidiWcation in Wrst steps of corrosion on EB coated aluminium surfaces.
Original languageEnglish
JournalCorrosion Science
Volume49
Issue number2
Pages (from-to)818-829
ISSN0010-938X
DOIs
StatePublished - 2007
Peer-reviewedYes
CitationsWeb of Science® Times Cited: 24

Keywords

  • Emeraldine base, Aluminium, Polyaniline, Pitting corrosion
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