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    Volume 6, Issue 5 (November 2017)

    Special Issue Paper

    Silica-Based Coatings for Corrosion Protection of AA7075 Aluminum Alloy

    (Received 29 January 2017; accepted 27 March 2017)

    Published Online: 2017

    CODEN: MPCACD

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    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,

    Bandeira, Rafael M.
    Instituto de Química de São Carlos Universidade de São Paulo, São Carlos,

    Aureliano, Ricardo T.
    Escola de engenharia de São Carlos Universidade de São Paulo, São Carlos,

    Lombardi, Amadeu N.
    Departamento de Engenharia Mecânica, Universidade Federal Tecnológica do Paraná, Londrina,

    Casteletti, Luiz C.
    Escola de engenharia de São Carlos Universidade de São Paulo, São Carlos,

    Totten, George E.
    Department of Mechanical and Materials Engineering, Portland State University, Portland, OR


    Stock #: MPC20170020

    ISSN:2379-1365

    DOI: 10.1520/MPC20170020

    Author
    Title Silica-Based Coatings for Corrosion Protection of AA7075 Aluminum Alloy
    Symposium ,
    Committee G01