Evaluation of corrosion inhibition performance of silica sol–gel layers deposited on galvanised steel

N. Cotolan, S. Varvara, E. Albert, G. Szabó, Z. Hórvölgyi, L. M. Mureşan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The present work reports a comparative investigation of the electrochemical behaviour of some new types of silica sol–gel coatings with enhanced corrosion resistance deposited on electrolytically or thermally (hot-dip) zinc-coated steel. The coatings were rendered hydrophobic by silylation. Dichlorodimethylsilane or trimethylchlorosilane were used as silylating agents and cetyltrimethylammonium bromide or Pluronic PE 10300, as templating agents. The morpho-structural and optical properties of compact and mesoporous silica coatings were characterised with different methods. The corrosion behaviour of the coatings was evaluated by open circuit potential measurements, Tafel interpretation of the polarisation curves and electrochemical impedance spectroscopy. Both silylating agents improve significantly the corrosion resistance of both porous and compact coatings by reducing the corrosion current density with at least one order of magnitude. The possibility to use the porous structure of the coatings as corrosion inhibitor carriers was explored by loading of mesoporous silica layers with 1H-benzotriazole.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalCorrosion Engineering Science and Technology
DOIs
Publication statusAccepted/In press - Jan 22 2016

Fingerprint

Steel
Silicon Dioxide
Silica
Corrosion
Coatings
Corrosion resistance
Poloxamer
Corrosion inhibitors
Electrochemical impedance spectroscopy
Zinc
Structural properties
Current density
Optical properties
Polarization
Networks (circuits)

Keywords

  • Corrosion protection
  • Inhibitors
  • Mesoporous silica coatings
  • Sol–gel method
  • Zinc-coated steel

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Evaluation of corrosion inhibition performance of silica sol–gel layers deposited on galvanised steel. / Cotolan, N.; Varvara, S.; Albert, E.; Szabó, G.; Hórvölgyi, Z.; Mureşan, L. M.

In: Corrosion Engineering Science and Technology, 22.01.2016, p. 1-10.

Research output: Contribution to journalArticle

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