Improving anticorrosion performance of epoxy coating by hybrids of rGO and g-C3N4 nanosheets / Zhuang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1219-1232 Titre : Improving anticorrosion performance of epoxy coating by hybrids of rGO and g-C3N4 nanosheets Type de document : texte imprimé Auteurs : Zhuang Liu, Auteur ; Rongtao Zhu, Auteur ; Xinxi Zhang, Auteur ; Haiyang Zhu, Auteur Année de publication : 2022 Article en page(s) : p. 1219-1232 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Electrochimie Epoxydes Nanoparticules Nitrure de carbone graphitique Oxyde de graphène Revêtements en phase aqueuse -- Additifs Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Applications of reduced graphene oxide (rGO) in epoxy (EP) anticorrosion coatings are hindered by its poor dispersibility and galvanic corrosion hazard with the metal matrix. With an excellent water dispersibility, the acid-treated g-C3N4 nanosheets (CNNS) can be physically combined with rGO through ultrasonic treatment so as to enhance the dispersion of rGO in waterborne epoxy. The structure and morphology of the new hybrids prepared by this simple ultrasonic treatment were characterized through FTIR, Raman, XRD, XPS, and TEM. The results show that the best anticorrosion performance of the coating is achieved in 0.5 M sulfuric acid when the mass ratio of CNNS and rGO in the hybrid is 1:5. Compared with the case of pure EP coating, the corrosion current density of the new hybrid decreases by one order of magnitude, and electrochemical impedance increases by nearly two orders of magnitude. The new CNNS@rGO hybrid prepared by a simple ultrasonic method has broad prospects in the field of waterborne epoxy resin anticorrosive coatings. Note de contenu : - EXPERIMENTAL METHOD : Materials - Preparation of CNNS and CNNS@rGO hybrid - Preparation of CNNS@rGO nanocomposite coating - Instruments and characterization - RESULTS AND DISCUSSION : Dispersibility of CNNS and rGO hybrids with different mass ratios - Chemical composition and microstructure - Coating interface state - EIS study of coatings in 0.5 M H2SO4 solution - Corrosion-resistant mechanism of the coatings - Table 1 : Detailed proportion of the composite coating - Table 2 : The fitted electrochemical parameters extracted from EIS experimental data - Table 3 : Electrochemical parameters obtained from the fitted sample polarization curve data DOI : https://doi.org/10.1007/s11998-021-00603-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00603-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38049 [article]

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Polyaniline/g-C3N4 composites as novel media for anticorrosion coatings / Shixiang Zuo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1307-1314 Titre : Polyaniline/g-C3N4 composites as novel media for anticorrosion coatings Type de document : texte imprimé Auteurs : Shixiang Zuo, Auteur ; Yao Chen, Auteur ; Wenjie Liu, Auteur ; Chao Yao, Auteur ; Yingruo Li, Auteur ; Jiangquan Ma, Auteur ; Yong Kong, Auteur ; Huihui Mao, Auteur ; Li Zhongyu, Auteur ; Yongsheng Fu, Auteur Année de publication : 2017 Article en page(s) : p. 1307-1314 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Electrochimie Exfoliation Nitrure de carbone graphitique Polyaniline Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, graphitic carbon nitride (g-C3N4) was first proposed for the pioneer application of anticorrosion coatings. Original g-C3N4 was facilely treated using HNO3 and the exfoliated g-C3N4 sheets (E-g-C3N4) were fabricated, and then, polyaniline/E-g-C3N4 composites (PANI/E-g-C3N4) as novel anticorrosive media were synthesized by chemical oxidative polymerization and devoted to the corrosion protection of coatings. The E-g-C3N4 sheets and PANI/E-g-C3N4 composites were characterized by X-ray diffraction, Fourier transform infrared, thermogravimetric analysis, and transmission electron microscopy. The anticorrosion properties of the samples prepared were investigated by electrochemical measurements including Tafel plots, electrochemical impedance spectra, and open-circuit potential. Accelerated corrosion tests of iron panels coated by PANI/E-g-C3N4 were performed in 3.5 wt% NaCl solution. Anticorrosive mechanism of PANI/E-g-C3N4 was discussed in detail. PANI/E-g-C3N4-3 fillers possessed superior corrosion inhibition than individual components on iron coatings, which was due to the synergetic effect of anticorrosion between E-g-C3N4 and PANI. Note de contenu : - EXPERIMENTAL : Preparation of PANI/E-g-C3N4 composites - Preparation of anticorrosion coatings - Characterization methods - Evaluation of anticorrosion performance - RESULTS AND DISCUSSION : Structures characterization - Morphologies characterization - Corrosion studies DOI : 10.1007/s11998-017-9916-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9916-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29635 [article]

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