Influence of Si nanoparticles on the electrochemical behavior of organic coatings on carbon steel in chloride environment / A. Madhankumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 5 (09/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 5 (09/2012) . - p. 609-620 Titre : Influence of Si nanoparticles on the electrochemical behavior of organic coatings on carbon steel in chloride environment Type de document : texte imprimé Auteurs : A. Madhankumar, Auteur ; N. Rajendran, Auteur ; T. Nishimura, Auteur Année de publication : 2012 Article en page(s) : p. 609-620 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Electrochimie Epoxydes Microscopie électronique à balayage Nanoparticules Revêtements -- Corrosion Revêtements:Peinture Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : Scanning electrochemical microscopy (SECM) is an excellent technique to detect electrochemical processes with high spatial resolution. In this work, the effect of silicon (Si) nanoparticles on the corrosion protection performance of epoxy-coated steel was examined by electrochemical impedance spectroscopy (EIS) and SECM analysis. The EIS was performed in continuous immersion in 0.1 M NaCl(aq) solution. The addition of Si nanoparticles increased the coating film resistance (R f) and the charge transfer resistance (R ct) of coated steel. SECM mapping and line scan analysis was performed in order to estimate the coating performance with Si nanoparticles in 0.1 M NaCl(aq) solution. SECM results indicated that the tip current at ?0.70 V was decreased by the addition of Si nanoparticles in epoxy film. These results suggested that the dissolved oxygen (DO) was consumed by anodic dissolution of Si nanoparticles. Surface analysis showed that the Si was enriched at the scratched region of the coated steel after a corrosion test. From these results, Si was dissolved as Si n+ and transferred to the scratched area, and then consumed the DO in the solution. Thus, the anodic dissolution of Fe at the scratched area was suppressed by the Si nanoparticles, which implies the sacrificial effect of Si from the coating against the steel corrosion. Hence, it was concluded that the Si nanoparticles had a beneficial effect on enhancing the corrosion resistance of the coated steel. Note de contenu : - EXPERIMENTAL PROCEDURE : Sample preparation - Mechanical characterization - The cross scratch testing - Onset corrosion measurements - Scanning electrochemical microscopic measurements - Electrochemical measurements - Surface characterization - RESULTS AND DISCUSSION : Mechanical characterization of epoxy coating with Si nanoparticles - Onset of corrosion measurement - The cross scratch testing analysis - EIS analysis of scratched coated steel in O.1 M NaCl(aq) solution - SECM line scan analysis - SECM topographic imaging - Surface characterization DOI : 10.1007/s11998-012-9398-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9398-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16032 [article]

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