Ethanol extract of propolis as a protective coating for mild steel in chloride media / L. M. P. Dolabella in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 543-555 Titre : Ethanol extract of propolis as a protective coating for mild steel in chloride media Type de document : texte imprimé Auteurs : L. M. P. Dolabella, Auteur ; J. G. Oliveira, Auteur ; V. Lins, Auteur ; T. Matencio, Auteur ; W. L. Vasconcelos, Auteur Année de publication : 2016 Article en page(s) : p. 543-555 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosifs Anticorrosion Electrochimie Métaux -- Revêtements protecteurs Propolis Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The anticorrosion performance of commercial extract of ethanolic propolis (EP)-coated mild steel samples immersed in a 3.5% w/v NaCl in neutral and near neutral media was evaluated by classical electrochemical and electrochemical probe beam deflection techniques. The functional groups and major components of the extract were identified by Fourier transform infrared spectroscopy and high-performance liquid chromatography, respectively. The extract and the major constituent identified in the extract, 3,5-diprenyl-4-hydroxycinnamic acid (DHCA), are poorly hydro-soluble in a neutral medium. The bare and coated carbon steel surfaces were characterized by scanning electron microscopy and atomic force microscopy before and after a saline immersion. The electrochemical response of the coated electrodes was compared with bare mild steel electrodes and all qualitative and quantitative data obtained supported the hypothesis that EP is a potential mild steel corrosion inhibitor. Although several flavonoids are known to have remarkable antioxidant properties and be effective metal corrosion inhibitors, this work is pioneering in its evaluation of the inhibitory capacity of a natural product whose main constituent is DHCA. Note de contenu : - PROPOLIS - THEORY OF ELECTROCHEMICAL AND OPTICAL EXPERIMENTS (EPBD) - METHODOLOGY : Propolis source - Electrolyte medium : composition and pH - Electrodes - Electrochemical experiments - Coupled electrochemical and optical experiments (EPBD) - Electrode surface characterization by atomic force microscopy (AFM) - Electrode surface characterization by scanning electron microscopy (SEM) - RESULTS AND DISCUSSION : Carbon steel and extract characterizations - Electrochemical experiments : open circuit potential (OCP), polarization resistance (PR), potentiodynamic linear polarization (LV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) - Coupled electrochemical and optical experiments (EPBD - Electrode surface characterization by atomic force microscopy (AFM) - Electrode surface characterization by scanning electron microscopy DOI : 10.1007/s11998-015-9765-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9765-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26294 [article]

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