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    Effect of organic precursor in hybrid sol–gel coatings for corrosion protection and the application on hot dip galvanised steel

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    Agustín-Sáenz2019_Ar ... (3.220Mb)
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    URI: http://hdl.handle.net/11556/893
    ISSN: 0928-0707
    DOI: 10.1007/s10971-018-4840-6
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    Author/s
    Agustín-Sáenz, Cecilia; Martín-Ugarte, Eider; Jorcin, Jean Baptiste; Imbuluzqueta, Gorka; Santa Coloma, Patricia; [et al.]
    Date
    2019-01
    Keywords
    Galvanised steel
    Corrosion protection
    Hybrid sol–gel coating
    Zirconium
    Bisphenol A
    Allyl-phenol
    Abstract
    Sol-gel coating material with enhanced corrosion protection for zinc-coated steel has been obtained through the incorporation of mono-phenol and bi-phenol organic precursors in an epoxide functionalised-silica-zirconia matrix. The effect of the presence of the organic precursors in the baseline formulation has been studied; sol stability has been examined by viscosity evolution; gel densification stage has been studied by differential scanning calorimetry (DSC); material composition has been analysed by Fourier transform infrared spectroscopy (FTIR) and X-ray spectroscopy (XPS); coating thickness and roughness has been measured by profilometry. Corrosion performance in three artificial weathering tests showed outstanding performance in the delay of zinc and steel corrosion products emergence, and electrochemical impedance spectroscopy (EIS) measurement permitted the identification of the coating presenting the most promising properties in terms of corrosion protection. Developed coatings ...
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