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Silica-Based Coatings for Corrosion Protection of AA7075 Aluminum Alloy
Materials Performance and Characterization
  • Galtiere Rêgo, Universidade de São Paulo
  • Rafael M. Bandeira, Universidade de São Paulo
  • Ricardo T. Aureliano, Universidade de São Paulo
  • Amadeu N. Lombardi, Universidade Federal Tecnológica do Paraná
  • Luiz Carlos Casteletti, Universidade de São Paulo
  • George E. Totten, Portland State University
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The large economic and environmental impact caused by corrosion of metal structures has demanded new types of anti-corrosion coatings. This study proposes the application of silica-based coatings for corrosion protection of AA7075 aluminum alloy in saline environments rich in chloride ions. These coatings were obtained using the sol-gel technique. The samples were dip-coated in two types of solutions: (a) a mix of tetraethyl orthosilicate (TEOS) with 3-(Trimethoxysilyl)propyl methacrylate (TMPM) (Coating 1); and (b) a mix of titanium (IV) isopropoxide (TIP) with TMPM (Coating 2). The cure temperatures of the coatings were of 25°C, 60°C, 100°C, and 130°C, with treatment times of 1 and 3 hours. Characterization of the coatings was done by potentiodynamic polarization in aqueous saline solution (sodium chloride 3.5 %), nanoscratching, and scanning electron microscopy (SEM). The layers produced were uniform with good scratch resistance and with superior corrosion resistance when compared to the substrate.

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Rêgo, G., Bandeira, R., Aureliano, R., Lombardi, A., Casteletti, L., and Totten, G., "Silica-Based Coatings for Corrosion Protection of AA7075 Aluminum Alloy," Materials Performance and Characterization, Vol. 6, No. 5, 2017, pp. 904-912.