Mesoporous silica coatings with improved corrosion protection properties

Emoke Albert, Nicoleta Cotolan, Norbert Nagy, G. Sáfrán, Gabriella Szabó, Liana Maria Mureşan, Z. Hórvölgyi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Sub-micrometer thin, compact and mesoporous silica coatings were prepared on Zn substrates by sol-gel method, aiming the replacement of traditional chromates conversion coatings and pretreatments. The effect of layer thickness, porosity and the character of pore structure, number of thermal treatments, and various silylating agents were studied on the anti-corrosion behavior of the coatings, systematically and comparatively. The surface-, structural-, and optical properties of various silica thin films were characterized with different methods thoroughly. The corrosion resistance of the coatings was comparatively evaluated by open circuit potential measurements, Tafel interpretation of the polarization curves, and electrochemical impedance spectroscopy. Thicker films have better anti-corrosion property, as expected. More interestingly, we show that porous layers can have such a good corrosion resistance as compact films. This fact has special importance when impregnation with inhibitor would be applied. Furthermore, rendering the coatings hydrophobic improves the corrosion resistance of both porous and compact coatings significantly. The character of pore structure, the type of silylating agents, and the thermal treatment applied between two consecutive dippings do not affect notably the protective properties of the silica films. Furthermore, we demonstrate the difference in the accessibility of the pores in the case of ordered and disordered pore structure.

Original languageEnglish
Pages (from-to)102-113
Number of pages12
JournalMicroporous and Mesoporous Materials
Volume206
Issue numberC
DOIs
Publication statusPublished - Apr 1 2015

Fingerprint

Corrosion protection
Silicon Dioxide
corrosion
Silica
silicon dioxide
coatings
Coatings
porosity
Pore structure
corrosion resistance
Corrosion resistance
Heat treatment
Corrosion
Chromates
chromates
dipping
Electrochemical impedance spectroscopy
Thick films
Impregnation
pretreatment

Keywords

  • Corrosion
  • Hydrophobicity
  • Mesoporous silica
  • Sol-gel coating
  • Zn substrate

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Mesoporous silica coatings with improved corrosion protection properties. / Albert, Emoke; Cotolan, Nicoleta; Nagy, Norbert; Sáfrán, G.; Szabó, Gabriella; Mureşan, Liana Maria; Hórvölgyi, Z.

In: Microporous and Mesoporous Materials, Vol. 206, No. C, 01.04.2015, p. 102-113.

Research output: Contribution to journalArticle

Albert, Emoke ; Cotolan, Nicoleta ; Nagy, Norbert ; Sáfrán, G. ; Szabó, Gabriella ; Mureşan, Liana Maria ; Hórvölgyi, Z. / Mesoporous silica coatings with improved corrosion protection properties. In: Microporous and Mesoporous Materials. 2015 ; Vol. 206, No. C. pp. 102-113.
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