| Titre : |
Hybrid sol-gel coatings for corrosion protection of galvanized steel in simulated concrete pore solution |
| Type de document : |
texte imprimé |
| Auteurs : |
Riba B. Figueira, Auteur ; Carlos J. R. Silva, Auteur ; Elsa V. Pereira, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 355-373 |
| 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
Corrosion
Electrochimie
Matériaux hybrides
Métaux -- Revêtements protecteurs
Sol-gel, Procédé
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The aim of this experimental research was to study the electrochemical behavior of organic–inorganic hybrid (OIH) coatings for corrosion protection of hot-dip galvanized steel (HDGS) in the first instants of immersion in simulated concrete pore solution (SCPS) (pH > 12.5). The electrochemical performance of the OIH coatings was assessed by electrochemical impedance spectroscopy, potentiodynamic polarization curves, macrocell current density, and polarization resistance. The OIH coatings were prepared via the sol–gel method and were deposited on HDGS surfaces by dip-coating using one or three dip steps. The electrochemical results obtained for HDGS samples coated with OIH matrices in SCPS showed higher corrosion resistance than bare HDGS; as the molecular weight (MW) of Jeffamine® increased the barrier protection of the coating decreased. The lowest protection efficiency was found for HDGS samples synthesized with oligopolymers with an MW of 2000. Coatings produced with an oligopolymer of 230 MW conferred the highest protection. The surface morphology of the OIH coatings deposited on HDGS surfaces was studied by atomic force microscopy. The results show that the roughness of the OIH films depends on the MW of Jeffamine® and on the number of dip-coating steps used. Thermogravimetry results show that the Jeffamine® MW affected the thermal properties of the prepared OIH samples. The prepared OIH materials are thermally stable within the range of 20–80°C. |
| Note de contenu : |
- EXPERIMENTAL : Reagents - Synthesis procedure of OIL ureasilicate matrix monoliths films and coatings by sol-gel method - Coating deposition - Electrochemical measurements - Coating morphology analysis - Thermogravimetric measurements (TGA)
- RESULTS AND DISCUSSION : Electrochemical impedance spectroscopy (EIS) - Potentiodynamic polarization studies - Macrocell current density (igal) and polarization resistance measurements - Surface characterization by AFM - Thermogravimetric analysis (TGA) |
| DOI : |
10.1007/s11998-015-9751-7 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9751-7.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26120 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 355-373
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