Bio-based vanillin alcohol diglycidyl ether (DGEVA)-silica coatings for corrosion protection of AA2024

•DGEVA, a bio-based epoxy from wood lignin, can replace toxic compounds in coatings.•Silica prepared by sol–gel enhances the adhesion of DGEVA coatings on AA2024.•Hybrid DGEVA-silica coating fosters stronger bonds and barrier properties on AA2024.•Bio-based coatings can be designed with simple proce...

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Bibliographic Details
Published in:Materials letters 2024-09, Vol.370, p.136774, Article 136774
Main Authors: Trentin, A., Merino, E.C., Samiee, R., Parchoviansky, M., Pakseresht, A.H., Durán, A., Castro, Y., Galusek, D.
Format: Article
Language:English
Subjects:
AA2024
Bio-based
Coatings
DGEVA
Epoxy
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Summary:•DGEVA, a bio-based epoxy from wood lignin, can replace toxic compounds in coatings.•Silica prepared by sol–gel enhances the adhesion of DGEVA coatings on AA2024.•Hybrid DGEVA-silica coating fosters stronger bonds and barrier properties on AA2024.•Bio-based coatings can be designed with simple processing using green chemicals. Currently, 75% of global epoxy polymers are based on bisphenol A (BPA), a substance identified as reprotoxic, posing challenges to the development of eco-friendly epoxy coatings. Our study reports the synthesis of three novel bio-based anti-corrosion coatings composed of vanillin alcohol diglycidyl ether (DGEVA) and silica nanoparticles, which were added to improve the adhesion to AA2024 substrates. The coatings present high adhesion (∼7 MPa) and excellent thermal stability (>295 °C), besides good corrosion protection of the hybrid coating (impedance modulus of ∼4 MΩ cm−2 in 3.5 wt% NaCl for > 68 days). The results reveal that proper silica distribution fosters adhesion and extends lifespan via metal oxide-polymer bonds.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2024.136774