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 language | English |
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Pages (from-to) | 5118-5127 |
Number of pages | 10 |
Journal | Electrochimica Acta |
Volume | 53 |
Issue number | 16 |
DOIs | |
State | Published - 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