Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024 / Chigoziri N. Njoku in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 797–813 Titre : Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024 Type de document : texte imprimé Auteurs : Chigoziri N. Njoku, Auteur ; Weichen Bai, Auteur ; Innocent O. Arukalam, Auteur ; Lihui Yang, Auteur ; Baorong Hou, Auteur ; Demian I. Njoku, Auteur ; Li Ying, Auteur Année de publication : 2020 Article en page(s) : p. 797–813 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Copolymère urée formaldéhyde Epoxydes Métaux -- Revêtements protecteurs Microcapsules Revêtement autoréparant Revêtement autoréparant:Peinture autoréparante Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Self-reparable microcapsules which can repair microcracks in the coating matrix and effectively inhibit the corrosion at the substrate/coating interface during service have been evaluated. The main objective was to fabricate an innovative pH-responsive permeability-switching polyurea-formaldehyde (PUF)-based microcapsule laden with 8-hydroxyquinoline (8-HQ) as the core material for the production of smart epoxy coating for the long-term protection of Al alloys. Combined improved barrier, active, and self-repairing properties indicating sort of triple-action corrosion mitigating ability of the modified epoxy-based smart coating was demonstrated by electrochemical impedance spectroscopy and scanning electron microscopy. The results indicate that the self-repairing action occurs via two mechanisms: firstly, by the initiation of chain mobility at the modified coating defects on heat treatment. Secondly, by the crosslinking of the swelled hydrogel present in the PUF shell wall via the various polymer–polymer interactions. The active corrosion protection was due to the (smart) pH response–release ability of the encapsulated inhibitor (8-HQ) with an increase in corrosion degree. Meanwhile, the even dispersal of the fabricated microcapsule with its intrinsic rough surface in the epoxy coating matrix contributed to the improved barrier and adhesive properties. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - RESULTS AND DISCUSSION : Microcapsule morphology - Loading amount of 8-HQ in PUF microcapsules - Chemical content of the microcapsule - Release profiles of loaded inhibitor - Barrier properties of the unscratched coating - Evaluation of the combined active and self-repairing ability of the coating - Physical performance assessments DOI : https://doi.org/10.1007/s11998-020-00334-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00334-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34109 [article]

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The polyaniline-modified TiO2 composites in water-based epoxy coating for corrosion protection of Q235 steel / Xuehui Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 71-80 Titre : The polyaniline-modified TiO2 composites in water-based epoxy coating for corrosion protection of Q235 steel Type de document : texte imprimé Auteurs : Xuehui Liu, Auteur ; Peimin Hou, Auteur ; Xia Zhao, Auteur ; Xiumin Ma, Auteur ; Baorong Hou, Auteur Année de publication : 2019 Article en page(s) : p. 71-80 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier -- Conservation Anticorrosifs Anticorrosion Chimie analytique Dioxyde de titane Epoxydes Métaux -- Revêtements protecteurs Polyacrylonitrile Revêtement autoréparant Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The development of active systems to protect metal substrates against corrosion is a promising approach for many industrial applications. In this work, a self-healing coating based on TiO2 particles modified with polyaniline (PANI) was prepared for corrosion protection of Q235 steel. TiO2/PANI particles were synthesized by in situ polymerization and dispersed into a water-based epoxy coating. The structure and morphology of as-prepared TiO2/PANI particles were characterized by FTIR, XRD, and SEM. The anticorrosion performance of the coating was studied by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM). EIS analysis showed improved corrosion protection properties in the presence of TiO2/PNAI particles. SECM measurements were performed to monitor the reduction of oxygen process as a function of exposure time in 3.5% NaCl solution. SECM results showed that the epoxy coating with TiO2/PANI particles had a superior corrosion protection relative to the blank coating after artificial defect exposure to the corrosive environment. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of TiO2 particles - Preparation of TiO2/PANI particles - Preparation of water-based epoxy coatings - Characterization - RESULTS AND DISCUSSION : Characterization of TiO2 particles - Surface properties of the coatings - Evaluation of anticorrosion performance DOI : 10.1007/s11998-018-0101-4 En ligne : https://link.springer.com/article/10.1007/s11998-018-0101-4 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31966 [article]

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