Mesoporous silica coatings with improved corrosion protection properties

Emoke Albert, Nicoleta Cotolan, Norbert Nagy, György Sáfrán, Gabriella Szabó, Liana Maria Mureşan, Zoltán Hórvölgyi

Research output: Contribution to journalArticle

18 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

Keywords

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

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Mesoporous silica coatings with improved corrosion protection properties'. Together they form a unique fingerprint.

  • Cite this