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Corrosion behavior of AA2024-T3 alloy treated with phosphonate-containing TEOS

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Abstract

Protection from corrosion of the aluminum alloy AA2024-T3 coated with a tetraethoxysilicate (TEOS)/aminotrimethyllenephosphonic acid (ATMP) film in a 0.05-mol L−1 NaCl solution was evaluated using electrochemical impedance spectroscopy, scanning electron microscopy, energy disperse spectroscopy, and atomic force microscopy. The present work investigates the influence of different pretreatment procedures of the alloy surface and the ATMP concentration on the corrosion resistance of the coated samples. The undoped sol–gel coatings did not provide adequate corrosion protection. The best corrosion protection was achieved using acetic acid pretreatment and subsequent deposition of an ATMP-modified TEOS film with an optimal concentration of 5.00 × 10−4 mol L−1 in the deposition bath. The acetic acid pretreatment promotes a decrease in galvanic corrosion and the surface enrichment of aluminum favoring the metalosiloxane and the metal–phosphonic bonds with increasing likely reaction sites, thus promoting the formation of a more homogeneous and compact coating with improved resistance.

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Acknowledgments

The authors gratefully acknowledge the support of this work by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

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  1. Institute of Chemistry, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil

    Viviane Dalmoro, João H. Z. dos Santos & Denise S. Azambuja

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  1. Viviane Dalmoro
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  2. João H. Z. dos Santos
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  3. Denise S. Azambuja
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Correspondence to Denise S. Azambuja.

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Dalmoro, V., dos Santos, J.H.Z. & Azambuja, D.S. Corrosion behavior of AA2024-T3 alloy treated with phosphonate-containing TEOS. J Solid State Electrochem 16, 403–414 (2012). https://doi.org/10.1007/s10008-011-1346-3

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  • DOI: https://doi.org/10.1007/s10008-011-1346-3

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