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Ormosil-ZrO2 hybrid nanocomposites and coatings on aluminium alloy for corrosion resistance; A sol-gel approach

Abstract

Corrosion resistant coatings are prepared from a hybrid nanocomposite aerogel derived from the tri-functional silanes, methyl trimethoxy silane (MTMS), glycidyloxy propyl trimethoxy silane (GPTMS) and from zirconium isopropoxide (ZIP) precursor which acts as an inorganic nano-dispersion in the organically modified silane (ORMOSIL) matrix. A series of hybrid compositions of MTMS and GPTMS are prepared in which the amount of ZIP was varied. The variations in the pH, viscosity and the gelation time of the prepared compositions are monitored. The wet alcogels thus obtained are homogenized in a solvent by an ultrasonicator followed by coating the suspension on aluminum alloy and glass substrates using a dip coating unit. The prepared coatings are further dried and annealed at 400 °C for 1h. The wet alcogels are also dried under ambient conditions for seven days resulting in hybrid nanocomposite aerogel monoliths and are calcined at 400 °C. The hybrid nanocomposites and coatings are further characterized by X-ray diffraction Analysis, Fourier Transform Infrared Spectroscopy, BET Surface Area Analysis, X-ray Photoelectron Spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), UV-Visible spectroscopy, potentiodynamic polarization and EIS measurements. The hybrid nanocomposite coated aluminum alloy shows an enhanced corrosion protection when compared to the uncoated aluminum alloy. The anticorrosive feature of the ORMOSIL-ZrO2 hybrid nanocomposite coating makes them an important candidate in the field of protective environment resistant coatings.

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Supplementary files

Publication details

The article was received on 29 Dec 2017, accepted on 10 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C7NJ05174C
Citation: New J. Chem., 2018, Accepted Manuscript
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    Ormosil-ZrO2 hybrid nanocomposites and coatings on aluminium alloy for corrosion resistance; A sol-gel approach

    S. V. Smitha, S. S S, A. M. Peer, B. N. Nair and H. U. N. Saraswathy, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ05174C

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