Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications / Arshad Ali Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1447-1466 Titre : Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications Type de document : texte imprimé Auteurs : Arshad Ali Khan, Auteur ; Afzal Khan, Auteur ; Zainab Zafar, Auteur ; Ishaq Ahmad, Auteur Année de publication : 2024 Article en page(s) : p. 1447-1466 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Caractérisation Dioxyde de silicium Epoxydes Éther de diglycidyle et de bisphénol A Marines (peinture) Matériaux hybrides Métaux -- Revêtements protecteurs Oxyde de graphène Revêtements -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion protection of aluminum alloys is severely compromised by marine environments, demanding the formulation of efficient protective coatings. Epoxy resin, diglycidyl ether of bisphenol A (DGEBA), and curing agent diethylenetriamine (DETA) were used with the mixing ratio of 100:12 to synthesize functionalized SiO2/GO-based composite coatings and investigate the corrosion protection efficacy for aluminum alloy AA6061 in marine environments. To boost the coatings' barrier and anticorrosive attributes, functionalized silica (FSiO2, with 0, 3, 6, 9, 12, and 15 wt%) and graphene oxide (GO) were jointly incorporated into the DGEBA/DETA epoxy-hardener system for producing composite coatings. The functionalization of silica particles using 3-aminopropyl-triethoxysilane and synthesis of GO was successfully carried out, according to the Fourier transform infrared spectroscopy evidence. The structural properties were investigated by X-ray diffraction. The hydrophobicity tests were conducted for the measurement of the contact angles. The highest static contact angle (126° ± 2) and the lowest contact angle (74° ± 1.5) were recorded for the sample EHS9GO2 and AA6061, respectively, which showed that EHS9GO2 coating had the most hydrophobic behavior. An adhesion test (method B, tape test) was performed on prepared coatings to check the quality of adhesion with the substrate aluminum alloy AA6061. The neat epoxy coating (EHS0GO0) displayed a fair adhesion rating of 3B, while EHS9GO2 coating exhibited excellent adhesion (5B) with substrate AA6061. Furthermore, electrochemical impedance spectroscopy and potentiodynamic polarization tests were employed for assessing the electrochemical behavior and anticorrosion performance of the prepared coatings. It was observed from the Bode plot, that the impedance magnitude/modulus for EHS9GO2 at lower frequencies was the highest as compared to other samples during immersion in the artificial seawater. The bare aluminum alloy substrate AA6061 had the highest corrosion rate of value 0.10483 ± 0.00198 mm/year, due to the direct contact with the electrolyte. Moreover, the highest value of Ecorr (356 ± 0.42 mV) and lowest values of Icorr (0.18 ± 0.03µA), βa (48.7 ± 2 mV/decade), and βc (28.8 ± 1 mV/decade) were witnessed for EHS9GO2 coating, showing significant anticorrosion efficiency against the corrosive electrolyte. Note de contenu : - EXPERIMENTAL : Materials, chemicals, and reagents - Epoxy resin and curing agent attributes - Surface modification of SiO2 particles - Synthesis of graphene oxide (GO) - Elemental composition of AA6061 - Fabrication of AA6061 and composite samples - Characterization - RESULTS AND DISCUSSION : Reaction mechanism - FTIR spectroscopy analysis - X-ray diffraction (XRD) examination - Contact angle measurement - Coatings adhesion assessment - Morphology - Electrochemical and corrosion protection performance DOI : https://doi.org/10.1007/s11998-023-000906-z En ligne : https://drive.google.com/file/d/1I2CSf8KcWcqezmqEPi0ol1DY5PitpxlV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41310 [article]

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