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Probing electrochemical mechanism of polyaniline and CeO 2 nanoparticles in alkyd coating with in-situ electrochemical-AFM and IRAS
KTH Royal Institute of Technology, Sweden.
University of Trento, Italy.
RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.ORCID-id: 0000-0001-8775-0602
KTH Royal Institute of Technology, School .
2019 (Engelska)Ingår i: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 132, s. 399-408Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The corrosion protection and electrochemical mechanism of solvent-borne alkyd composite coating containing 1.0 wt.% polyaniline (PANI) and 1.0 wt.% CeO 2 nanoparticles (NPs) for carbon steel in 3.0 wt.% NaCl solution were investigated by means of scanning electron microscopy (SEM), ex-situ, in-situ and electrochemical controlled (EC) atomic force microscopy (AFM), open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) methods. The SEM and ex-situ AFM results revealed the micro- and nanostructure of the composite coating. The in-situ sequential AFM images and line profiling analysis indicated electrochemical activity of the NPs and a high stability of the composite coating in NaCl solution. The results of EC-AFM combined with cyclic voltammetry (CV) demonstrated volume change of the PANI NPs upon reduction and oxidation at certain applied potentials on the coating. The redox reactions between the different forms of PANI and the effect of the CeO 2 NPs on the polymerization of the composite polymer were further confirmed by infrared reflection absorption spectroscopy (IRAS). The OCP and EIS results revealed that the composite coating provided an improved corrosion protection for carbon steel within several days of exposure, which was attributed to the barrier protection of CeO 2 NPs and the passivation ability of PANI.

Ort, förlag, år, upplaga, sidor
Elsevier B.V. , 2019. Vol. 132, s. 399-408
Nyckelord [en]
Alkyd coating, CeO 2, Corrosion mechanism, In-situ and EC-AFM, EIS, Nanoparticles, Polyaniline, Absorption spectroscopy, Atomic force microscopy, Cerium oxide, Composite coatings, Corrosion resistant coatings, Cyclic voltammetry, Electrochemical corrosion, Electrochemical impedance spectroscopy, Redox reactions, Scanning electron microscopy, Sodium alloys, Sodium chloride, Steel corrosion, Alkyd coatings, CeO2, Corrosion mechanisms, Electrochemical activities, Electrochemical mechanisms, Infrared reflection absorption spectroscopy, Micro and nanostructures, Open circuit potential, Cerium alloys
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Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-38352DOI: 10.1016/j.porgcoat.2019.04.012Scopus ID: 2-s2.0-85063906914OAI: oai:DiVA.org:ri-38352DiVA, id: diva2:1313838
Anmärkning

 Funding text 1: Financial support from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement No. SteelCoat 263262 is gratefully acknowledged. Dr. Matthew Fielden at the Department of Chemistry, KTH is gratefully acknowledged for language correction and comments for the results. J. Li thanks Dr. Mats Sandgren at Swedish University of Agricultural Sciences for kind help with potential plagiarism check.

Tillgänglig från: 2019-05-06 Skapad: 2019-05-06 Senast uppdaterad: 2023-05-09Bibliografiskt granskad

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Ahniyaz, Anwar

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