Corrosion inhibition of magnesium by combined zirconia silica sol-gel films

Yair Tamar, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

The inhibition of Mg (AZ91D) corrosion by thin sol-gel films was studied. The sol-gel films were prepared by the traditional acid or base-catalyzed hydrolysis and condensation, and finally deposited by dip coating. Two different sol-gel monomers were used: phenyltrimethoxysilane (PTMOS) and zirconium(IV)tetra-1-propoxide (ZrTPO). Films were made of each of the individual monomers and by depositing first a PTMOS film followed by ZrTPO-based film. The corrosion inhibition of the films and their characterization were examined by different methods including potentiodynamic polarization, contact angle measurement, adhesion test, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). We found that while the ZrTPO-based film did not show a significant corrosion inhibition, the PTMOS-based film provided moderate protection. Interestingly, the combined film exhibited superior corrosion inhibition as compared with the other films.

Original languageAmerican English
Pages (from-to)5118-5127
Number of pages10
JournalElectrochimica Acta
Volume53
Issue number16
DOIs
StatePublished - 30 Jun 2008

Bibliographical note

Funding Information:
This research was supported by GM Foundation Israel Program. The Harvey M. Krueger Family Center for Nanoscience and Nanotechnology of the Hebrew University is acknowledged.

Keywords

  • Corrosion
  • Magnesium
  • Silica
  • Sol-gel
  • Thin films
  • Zirconia

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