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Protection of Galvanized Steel with Silanes: Its Comparison with Chromium(VI)

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Abstract

The corrosion behavior of hot dip galvanized steel (HDGS) pre-treated with mercaptopropyltrimethoxysilane and a commercial sulfur-bearing silane was studied. Electrochemical polarization, electrochemical impedance spectroscopy, and electrochemical noise tests showed that silane coatings have a corrosion protection performance similar to the usual hexavalent chromium HDGS passivation treatments. It is also evident that the silane films protect the zinc surface through the formation of an isolating barrier. Through voltamperometric studies it was possible to define an electrochemical porosity of the protective coatings. Based on copper sulfate tests and electrochemical porosity results the films protection capability was evaluated, showing that silane treatments have similar or even better protection performance than standard chromium passivation.

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Acknowledgment

The authors thank the Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and the Universidad Nacional de La Plata (UNLP) by the financial support to carry out the present research paper. The authors also thank to Bernardo Browne and Andrés Campbell from Camsi-X for the silanes to do this research.

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Authors and Affiliations

  1. Centro de Investigación y Desarrollo en Tecnología de Pinturas, CIDEPINT, CICPBA-CONICET, Av. 52 s/n entre 121 y 122, B1900AYB, La Plata, Argentina

    P. R. Seré, C. Deyá, W. A. Egli, C. I. Elsner & A. R. Di Sarli

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  1. P. R. Seré
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  2. C. Deyá
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  3. W. A. Egli
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  4. C. I. Elsner
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  5. A. R. Di Sarli
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Correspondence to W. A. Egli.

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Seré, P.R., Deyá, C., Egli, W.A. et al. Protection of Galvanized Steel with Silanes: Its Comparison with Chromium(VI). J. of Materi Eng and Perform 23, 342–348 (2014). https://doi.org/10.1007/s11665-013-0746-1

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  • DOI: https://doi.org/10.1007/s11665-013-0746-1

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