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

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

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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 natio celebrate eyeshadow palette (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 soderhamn ottoman cover (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.