Self-assembly of SiO2 films on aluminum flakes for corrosion protection

Thin and dense films are required to protect aluminum flakes in waterborne coatings from corrosion while maintaining their luster. We herein report the preparation of a self-assembled SiO 2 film from tetraethoxysilane (TEOS) using acid- and alkali-catalyzed sol-gel processes. The different SiO 2 str...

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Bibliographic Details
Published in:Chemical engineering communications 2022-02, Vol.209 (2), p.196-205
Main Authors: Zhang, Qixing, Zhou, Weiming, Lawan, Ibrahim, Etuk, Samuel, Zhang, Mingxin, Garba, Zaharaddeen N., Fernando, Gerard, Yuan, Zhanhui
Format: Article
Language:English
Subjects:
Acid-catalyzed
Acids
alkali-catalyzed
Aluminum
Aluminum flakes
anticorrosion
Catalysis
coating sequence
Coatings
Corrosion
Corrosion prevention
Corrosion resistance
Metal oxides
Self-assembly
Silicon dioxide
SiO
Sol-gel processes
Tetraethyl orthosilicate
Thin films
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Summary:Thin and dense films are required to protect aluminum flakes in waterborne coatings from corrosion while maintaining their luster. We herein report the preparation of a self-assembled SiO 2 film from tetraethoxysilane (TEOS) using acid- and alkali-catalyzed sol-gel processes. The different SiO 2 structures formed under acid and alkali catalysis assembled into a compact SiO 2 film on the aluminum flakes, imparting corrosion resistance and stability under acidic conditions. The self-assembled film obtained when the acid-catalyzed process was performed before the alkali-catalyzed process was superior to that obtained when the sequence was reversed. This film was also significantly denser than the single coatings obtained from acid or alkali catalysis alone. FTIR, XRD, BET, SEM, TG, and theoretical calculations confirmed the formation of a dense film via the self-assembly of different types of SiO 2 particles. This process may also be applicable to the formation of colored aluminum flakes via coating with other metal oxides.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986445.2020.1852399