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Electropolymerization and possible corrosion protection effect of polypyrrole coatings on AA1050 (UNS A91050) in NaCl solutions
Department of Industrial Engineering, University of Trento, Trento, Italy.
Center for Materials and Microsystems, Fondazione Bruno Kessler (FBK), Trento, Italy.
Department of Industrial Engineering, University of Trento, Trento, Italy.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0001-6445-6005
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2019 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 75, no 7, p. 745-755Article in journal (Refereed) Published
Abstract [en]

Effect of solution chemistry on the electropolymerization and the electrochemical properties of polypyrrole coatings on aluminum is studied by means of electrochemical techniques, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy. It is shown that the protection effect of the coating in long-term exposures and when exposed to more concentrated NaCl solutions depends on the chemistry of electropolymerization electrolyte. The results show that nitrate anions passivate the aluminum substrate during the electropolymerization process. The resulting coating is less prone to blistering in a NaCl solution and probably due to its higher electrochemical activity presents a higher anodic protection effect. The galvanic interaction of polypyrrole coating with aluminum in a NaCl solution is directly observed using focused ion beam-assisted SEM.

Place, publisher, year, edition, pages
National Association of Corrosion Engineers International , 2019. Vol. 75, no 7, p. 745-755
Keywords [en]
Aluminum, Conductive polymer, Corrosion protection, Galvanic interaction, Passivation, Polypyrrole, Aluminum coatings, Aluminum corrosion, Anodic protection, Electrolytes, Electropolymerization, Galvanic corrosion, Ion beams, Polypyrroles, Scanning electron microscopy, Sodium chloride, X ray photoelectron spectroscopy, Aluminum substrate, Electrochemical activities, Electrochemical techniques, Long term exposure, Polypyrrole coatings, Solution chemistry, Corrosion resistant coatings
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-45537DOI: 10.5006/3124ISI: 000474438600005Scopus ID: 2-s2.0-85069675948Local ID: HOA JTH 2019;JTHMaterialISOAI: oai:DiVA.org:hj-45537DiVA, id: diva2:1342098
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-13Bibliographically approved

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Andersson, Nils-EricZanella, Caterina

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