Facile preparation of anticorrosive and decorative multifunctional coatings via the inclusion of pearlescent oxide-covered mica pigments / Walaa M. Abd El-Gawad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 603-622 Titre : Facile preparation of anticorrosive and decorative multifunctional coatings via the inclusion of pearlescent oxide-covered mica pigments Type de document : texte imprimé Auteurs : Walaa M. Abd El-Gawad, Auteur ; Essam A. Mossalam, Auteur ; Mohamed M. Selim, Auteur Année de publication : 2023 Article en page(s) : p. 603-622 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Arrachement (matériaux) Brillance (optique) -- Mesure Caractérisation Colorimétrie Epoxydes Evaluation Formulation (Génie chimique) Mica Oxydes métalliques Pigments nacrés Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements décoratifs Revêtements décoratifs:Peinture décorative Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The keynote of this work was to prepare cost-saving intensely colored pearlescent pigments with anticorrosive properties via deposition of a low ratio of expensive mixed oxides on mica to be applied in decorative and anticorrosive multifunctional coatings. Herein, a mixture of CeO2 and Fe2O3 was precipitated on mica to prepare anticorrosive pigment with golden color, while brilliant intensive orange pigment was prepared via the deposition of ZrO2.Fe2O3 mix on mica. The prepared pearlescent pigments based on mica flakes covered with CeO2.Fe2O3 and ZrO2.Fe2O3 were characterized using scanning electron microscopy, energy-dispersive X-ray analysis, X-ray fluorescence, and thermal gravimetric analysis. The mixed oxide-covered mica pigments (Ce-Fe@M and Zr-Fe@M) were applied in two paint formulations in addition to one formulation containing mica for comparison. The color of the resulting coatings was investigated utilizing the CIELab technique. Additionally, the inhibitive properties of the coatings were determined using potentiodynamic anodic polarization, open circuit voltage, linear polarization resistivity, and electrochemical impedance spectroscopy techniques. The results declared that the color of the coating containing CeO2.Fe2O3@M is gold and that of ZrO2.Fe2O3/M is brilliant orange. Moreover, the results deduced that the resistance of coating containing Ce-Fe@M ranged between (5061–4887 Ω) and that containing Zr-Fe@M is from 6846 to 3290 Ω, while coating based on mica is the least. These results revealed that the present study has succeeded in offering both anticorrosive and decorative functions in a single-layered coat. Note de contenu : - EXPERIMENTAL : Materials - Characterization of the prepared pigments - Application in coatings - Methods of testing and evaluation of coating - RESULTS AND DISCUSSION : Pigments characterization - FTIR - Coatings morphology - Corrosion results - Color and gloss measurements - Mechanical properties of the coatings - Pull-off strength results - Table 1 : The paint formulations - Table 2 : XRF analysis of mica, Ce-Fe@M, and Zr-Fe@M - Table 3 : Corrosion resistance of the coatings containing mica, Ce-Fe@M, and Zr-Fe@M - Table 4 : Electrochemical measurements results obtained from potentiodynamicanodic polarization and OCV technique - Table 5 : EIS data of the coatings containing mica, Ce-Fe@M, and Zr-Fe@MTable 6 Color and gloss results of coatings containing mica, Ce-Fe@M, and Zr-Fe@M DOI : https://doi.org/10.1007/s11998-022-00693-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00693-z.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39306 [article]

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A novel approach for new cost-saving durable anticorrosive and antibacterial coatings / Walaa M. Abd El-Gawad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1263-1281 Titre : A novel approach for new cost-saving durable anticorrosive and antibacterial coatings Type de document : texte imprimé Auteurs : Walaa M. Abd El-Gawad, Auteur ; Nivin M. Ahmed, Auteur ; Wael S. Mohamed, Auteur ; Eglal R. Souaya, Auteur Année de publication : 2019 Article en page(s) : p. 1263-1281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétate de vinyle L'acétate de vinyle est l'ester de l'acide acétique (acide éthanoïque) avec le tautomère alcoolique de l'éthanal (acétaldéhyde) et de formule semi-développée, CH3COO–CH=CH2. L'acétate de vinyle est préparé, en règle générale, en phase vapeur, en faisant réagir un grand excès d'acétylène sur de l'acide acétique (200 °C) en présence de catalyseurs au zinc et au cadmium). On obtient un liquide incolore à odeur très pénétrante qui ne se polymérise en polyacétate de vinyle (PVAC) qu'en présence de catalyseurs et donne des solides durs très stables à la chaleur. Il peut être copolymérisé avec d'autres composés vinyliques ou d'autres monomères. Antibactériens Anticorrosifs Anticorrosion Copolymérisation Essais accélérés (technologie) Evaluation Matériaux -- Propriétés fonctionnelles Matériaux hybrides Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Zéolites Index. décimale : 667.9 Revêtements et enduits Résumé : Multifunctional coatings that perform various actions simultaneously are now of prevailing importance, with zeolites being one of the most useful materials in this field. In this work, Na-P-zeolite was prepared from kaolin and subjected to a cation-exchange process to replace Na+ by Cu2+ and/or Zn2+ to achieve anticorrosive and antibacterial effects. In situ emulsion polymerization of vinyl acetate-vinyl versatate (VAc-VEOVA) copolymer at the nanoscale with P-zeolite and Zn-, Cu-, Zn/Cu-cation-exchanged P-zeolites was then applied to obtain P-zeolite-(VAc-VEOVA), Zn-P-zeolite-(VAc-VEOVA), Cu-P-zeolite-(VAc-VEOVA), and Zn/Cu-P-zeolite-(VAc-VEOVA) nanocomposites. Anticorrosive and antibacterial tests were then carried out on films containing the different nanocomposites using laboratory accelerated testing, electrochemical impedance spectroscopy (EIS), and the disc well diffusion method with different types of Gram-positive (G+) and Gram-negative (G−) bacteria, revealing that the film containing the mixed (Zn/Cu)-P-zeolite showed the best anticorrosive and antibacterial performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of P-zeolite - Prepration of cation-exchanged P-zeolites - Preparation of (VAc-VEOVA) copolymer nanocomposites by in situ emulsion polymerization - Paint preparation - Preparatin of steel panels for anticorrosion testing - Preparation of specimens for antibacterial testing - METHODS OF TESTING AND EVALUATION OF PAINTS : Anticorrosion measurements - RESULTS AND DISCUSSION : Characterization of P-zeolite and cation-exchanged P-zeolites - Characterization of the prepared nanocomposites - Anticorrosion performance of paints containing P-zeolite and cation-exchanged P-zeolites - Antibacterial results for cation-exchanged P-zeolites and their paint formulations DOI : 10.1007/s11998-019-00202-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00202-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33010 [article]

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