Innovative Formulation Combining Al, Zr and Si Precursors to Obtain Anticorrosion Hybrid Sol-Gel Coating

Clément Genet (1, 2) , Marie-Joëlle Menu (1) , Olivier Gavard (2) , Florence Ansart (1) , Marie Gressier (1) , Robin Montpellaz (2)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 Amphenol-Socapex

The aim of our study is to improve the aluminium alloy corrosion resistance with Organic-Inorganic Hybrid (OIH) sol-gel coating. Coatings are obtained from unusual formulation with precursors mixing: glycidoxypropyltrimethoxysilane (GPTMS), zirconium (IV) propoxide (TPOZ) and aluminium tri-sec-butoxide (ASB). This formulation was characterized and compared with sol formulations GPTMS/TPOZ and GPTMS/ASB. In each formulation, a corrosion inhibitor, cerium (III) nitrate hexahydrate, is employed to improve the corrosion performance. Coatings obtained from sol based on GPTMS/TPOZ/ASB have good anti-corrosion performances with Natural Salt Spray (NSS) resistance of 500 h for a thickness lower than 4 µm. Contact angle measurement showed a coating hydrophobic behaviour. To understand these performances, nuclear magnetic resonance (NMR) analyses were performed, results make sol-gel coating condensation evident and are in very good agreement with previous results.

Mots clés: Aluminium alloy 6061; Sol-gel process; Hybrid coating; Corrosion resistance

Domaines: Matériaux

Clément Genet, Marie-Joëlle Menu, Olivier Gavard, Florence Ansart, Marie Gressier, et al.. Innovative Formulation Combining Al, Zr and Si Precursors to Obtain Anticorrosion Hybrid Sol-Gel Coating. Molecules, 2018, 23 (5), pp.1135. ⟨10.3390/molecules23051135⟩. ⟨hal-02335651⟩