Journal Published Online: 27 September 2017
Volume 6, Issue 5

Silica-Based Coatings for Corrosion Protection of AA7075 Aluminum Alloy

CODEN: MPCACD

Abstract

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.

Author Information

Rêgo, Galtiere C.
Escola de engenharia de São Carlos Universidade de São Paulo, São Carlos, Brazil
Bandeira, Rafael M.
Instituto de Química de São Carlos Universidade de São Paulo, São Carlos, Brazil
Aureliano, Ricardo T.
Escola de engenharia de São Carlos Universidade de São Paulo, São Carlos, Brazil
Lombardi, Amadeu N.
Departamento de Engenharia Mecânica, Universidade Federal Tecnológica do Paraná, Londrina, Brazil
Casteletti, Luiz C.
Escola de engenharia de São Carlos Universidade de São Paulo, São Carlos, Brazil
Totten, George E.
Department of Mechanical and Materials Engineering, Portland State University, Portland, OR
Pages: 9
Price: $25.00
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Stock #: MPC20170020
ISSN: 2379-1365
DOI: 10.1520/MPC20170020