Corrosion-resistant composite coatings based on a graphene oxide–metal oxide/urushiol formaldehyde polymer system / Lei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1209-1225 Titre : Corrosion-resistant composite coatings based on a graphene oxide–metal oxide/urushiol formaldehyde polymer system Type de document : texte imprimé Auteurs : Lei Zhang, Auteur ; Wupin Wang, Auteur ; Haitang Wu, Auteur ; Zeyu Zheng, Auteur ; Ming Wei, Auteur ; Xiaohua Huang, Auteur Année de publication : 2021 Article en page(s) : p. 1209-1225 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Bases (chimie) Copolymère urushiol formaldéhyde Dioxyde de titane Métaux -- Revêtements protecteurs Oxyde d'yttrium Oxyde de graphène Résistance chimique Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : Composite coatings were fabricated based on a graphene oxide–metal oxide/urushiol formaldehyde polymer (GO–TiO2/UFP, GO–SiO2/UFP and GO–Y2O3/UFP) system with modifications, and its effectiveness in corrosion protection of metal substrates was demonstrated. First, a GO–TiO2 composite was synthesized using titanium dioxide loading on GO via 3-aminopropyltriethoxysilane (APTES). The GO–Y2O3 composite was synthesized using nano-yttrium oxide intercalating into GO through two different silane coupling agents. The GO–SiO2 composite was synthesized via an in-situ two-step sol-gel process utilizing APTES and tetraethylorthosilicate (TEOS) in an aqueous ethanol solution. The morphology and structure of the GO–metal oxide composites (GO–TiO2, GO–Y2O3 and GO–SiO2) were studied. Subsequently, GO–metal oxides were incorporated into UFP to investigate the composite’s effectiveness in corrosion protection of metal substrates. Compared with GO–TiO2/UFP and GO–Y2O3/UFP, GO–SiO2/UFP showed superior alkali-resistance enhancing performance. Additionally, GO crosslinked with APTES–TiO2 via covalent bonds and the well-dispersed GO–TiO2 in UFP improved the electrochemical corrosion properties of the UFP coatings, most likely due to the obstruction of the diffusion pathways inside the UFP coating matrix, thus preventing the diffusion of penetrating species. It was revealed that the corrosion resistance of GO–TiO2/UFP composite coating was noticeably higher than GO–SiO2/UFP and GO–Y2O3/UFP composite coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Fabrication process of the composite coatings - Characterization of composite coatings - Analysis of chemical resistance properties - RESULTS AND DISCUSSION : FTIR analysis - Microstructure and chemical composition of GO–metal oxide in UFP - XRD analysis - XPS analysis - Electrochemical tests - Chemical resistance of the UFP composite coatings - Corrosion protection mechanism - Table 1 : The XPS results for the GO–TiO2, GO–Y2O3 and GO–SiO2 sample - Table 2 : Electrochemical parameters obtained from the polarization curves of the UFP coatings containing different contents of GO–TiO2, GO–Y2O3, GO–SiO2 and MGO - Table 3 : Electrochemical parameters obtained from the EIS spactra of the UFP coatings containing different contents of GO–TiO2, GO–Y2O3 and GO–SiO2 - Table 4 : Resistance of the GO–TiO2/UFP, GO–Y2O3/UFP and GO–SiO2/UFP composite coatings against chemical attack after immersion in 30% H2SO4, 10% NaOH and 3% NaCl solution at room temperature DOI : https://doi.org/10.1007/s11998-021-00480-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00480-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36426 [article]

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