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

  • Cecilia Agustín-Sáenz
  • Eider Martín-Ugarte
  • Jean Baptiste Jorcin
  • Gorka Imbuluzqueta
  • Patricia Santa Coloma
  • Usoa Izagirre-Etxeberria
Original Paper: Sol-gel and hybrid materials for energy, environment and building applications
  • 41 Downloads

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 have shown outstanding contribution to service life extension of zinc-coated parts.

Highlights

  • New hybrid sol–gel coating composition for enhancing corrosion protection of galvanised steel is studied.

  • Addition of bi-functionalised organic precursor to silica and zirconia network permits to synthesise the coating with the highest barrier effect.

  • Hybrid sol–gel coating contributes to extend the bright and glossy typical appearance of ‘freshly galvanised’ steel.

Keywords

Galvanised steel Corrosion protection Hybrid sol–gel coating Zirconium Bisphenol A Allyl-phenol 

Notes

Acknowledgements

The authors thank the support of the Basque Government for EMAITEK 2017 program and the ELKARTEK project NG-FAB16 (contract number KK2016-00025). The authors thank CIC BiomaGUNE and Luis Yate for XPS characterisation.

Compliance with ethical standards

Conflict of interest

The authors are solely responsible for the content of this work and it only reflects the author’s view.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.TECNALIA (Energy and Environment Division)Parque Científico y Tecnológico de GipuzkoaDonostia - San SebastiánSpain

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