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Titre :
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Study on corrosive electrochemical behaviors of zinc-rich and graphite-filled epoxy coatings in 3.5 wt% NaCl solution (2012)
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Auteurs :
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J. Liu, Auteur ;
F. Wang, Auteur ;
K. C. Park, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Materials and corrosion (Vol. 62 N° 11, Novembre 2011)
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Article en page(s) :
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pp.1008–1014
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Note générale :
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Génie Mécanique
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Langues :
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Anglais
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Index. décimale :
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620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux)
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Tags :
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Corrosive behaviors EIS Epoxy coatings Mechanisms Seawater
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Résumé :
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Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (Rp) of the graphite-filled epoxy coating tested, which presents the film barrier performance, is higher than those of 6101 epoxy resin for initial seawater immersion, but the coating resistance of the zinc-rich epoxy coating was lower than that of 6101 epoxy resin. After salt spray tests, zinc-rich epoxy coating coated on the metal still has good anti-corrosion performances due to the existence of protection effects called “electrochemical” and “chemical” protection. Those behaviors and degradation mechanisms of two coatings can be explained by a series of measured electrochemical impedance spectroscopy measurements, and two equivalent circuit models were proposed to explain the degradation processes of the two organic coatings.
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DEWEY :
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620.1
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ISSN :
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0947-5117
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En ligne :
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http://onlinelibrary.wiley.com/doi/10.1002/maco.200905517/abstract
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