Titre : |
Phosphorylated PVA coatings for corrosion protection of Mg AZ31 alloy |
Type de document : |
texte imprimé |
Auteurs : |
Carlos Henrique Michelin Beraldo, Auteur ; Almir Spinelli, Auteur ; Nico Scharnagl, Auteur ; Thiago Ferreira da Conceição, Auteur |
Année de publication : |
2024 |
Article en page(s) : |
p. 243-253 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Anticorrosifs Anticorrosion Caractérisation Magnésium -- Alliages Métaux -- Revêtements protecteurs PhosphorylationLa phosphorylation est l'addition d'un groupe phosphate (un phosphoryl PO32- plus précisément) qui est transféré à une protéine ou à une petite molécule, telle le glucose ou l'adénine. Polyacétate de vinyle Polyacétate de vinyle phosphorylé Revêtements organiques
|
Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
In this paper, the influence of different amounts of phosphoric acid on the protective properties of phosphorylated PVA (PPVA) coatings on a Mg AZ31 alloy is investigated. PPVA coatings and free-standing films were prepared by dip-coating and casting, respectively, and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and swelling assays. The anticorrosion properties of the coatings were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization, both in 3.5 wt% NaCl solution. The results show that |Z| values increase with the amount of H3PO4, reaching values on the order of 105 Ω cm2 for the coating with the highest amount of H3PO4 (0.100 PPVA). Additionally, this sample shows the lowest swelling degree (around 80%). Polarization tests demonstrate that all coatings significantly decrease jcorr (from 4.8 μA cm−2 to values around 0.3 μA cm−2) by means of a cathodic inhibition. These results make of PPVA coatings interesting water-based alternatives to polysaccharide coatings. |
Note de contenu : |
- MATERIALS AND METHODS : Materials - Free-standing films preparation and characterization - Coatings preparation and characterization
- RESULTS AND DISCUSSION : Free-standing films characterization -
Coatings characterization
- Table 1 : Composition of the AZ31 Mg alloy
- Table 2 : Average values obtained from the polarization curves |
DOI : |
https://doi.org/10.1007/s11998-023-00813-3 |
En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-023-00813-3.pdf |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40444 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 243-253