| Titre : |
Tamarind shell tannin-doped hybrid sol-gel coatings on mild steel in acidic medium toward improved corrosion protection |
| Type de document : |
texte imprimé |
| Auteurs : |
Abdullahi Abdulmajid, Auteur ; Tuan Sherwyn Hamidon, Auteur ; M. Hazwan Hussin, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 527-542 |
| 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
Caractérisation
Extraction (chimie)
Métaux -- Revêtements protecteurs
Sol-gel, Procédé
Tanins végétaux
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
This study investigated the application of tamarind shell tannin extracts (TSTE) [isolated using methanol (TME) and 70% acetone (TAE)]-doped hybrid sol-gel coatings prepared using (3-Glycidyloxypropyl)trimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) in 0.5 M HCl solution. The anticorrosion properties of these hybrid coatings on the surface of mild steel electrodes were described using potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS) measurements. The hybrid sol–gel coatings were characterized via FTIR. Also, the hydrophobicity of the coated plates was determined through water contact angle measurement. Meanwhile, the surface morphology and elemental compositions were determined using SEM/EDX analyses. The electrochemical measurements showed that the mixture of doped TME and TAE hybrid sol-gel coating resulted in higher corrosion resistance. The corrosion inhibition efficiency (CE) was CETME = 94.02 % and CETAE = 91.35 %, respectively. The Tafel slopes revealed a mixed form of corrosion protection with the main effect at cathodic sites. FTIR absorption bands attained at 945 cm-1 for TME and 961 cm-1 for TAE revealed Fe-O-Si bond formation. The higher corrosion inhibition capability of the coating matrix corroborates to higher water contact angle (θTME = 107.64°, θTAE = 104.62°) values. SEM analysis revealed coatings' improved corrosion protection due to the doping's enhanced inhibitive performance. |
| Note de contenu : |
- Table 1 : Nyquist impedance parameters at various concentrations of TME- and TAE-doped hybrid sol-gel in 0.5 M HCl solution at 303 K
- Table 2 : Tafel parameters of undoped and TME- and TAE-doped hybrid sol–gel and their comparison with the bare mild steel in 0.5 M HCl solution at 303 K
- Table 3 : The FTIR bands of hybrid sol-gel matrix, coated hybrid sol–gel, and TAE- and TME-doped sol-gel coating
- Table 4 : The percentage of an element for the uncoated mild steel and hybrid sol-gel coated with TME and TAE extracts on mild steel acquired using EDX analysis |
| DOI : |
https://doi.org/10.1007/s11998-021-00539-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-021-00539-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37285 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 527-542
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