The study of protective film formation on Mg alloys by exposure to sodium selenite solutions was conducted. Anodic polarization studies, electrochemical impedance spectroscopy studies, morphological analysis, and Energy-dispersive X-ray spectroscopy were performed on AZ31 Mg alloy after coating treatment in different concentrations of sodium selenite. The corrosion resistance was improved by around 5 times compared with control. Improved resistance to localized corrosion was observed in the coatings treated by 5 mM or 10 mM sodium selenite. The protection mechanism was ascribed to the transformation of selenite to insoluble selenium, the formation of insoluble MgSeO3 hydrate, and polymerization of amorphous selenium.
|Number of pages||9|
|State||Published - Jan 2 2021|
Bibliographical noteFunding Information:
Funding: This research was funded by The Army Research Laboratory grant number W911NF-14-2-0004.
© 2021 by the authors. Li-censee MDPI, Basel, Switzerland.
ASJC Scopus subject areas
- Materials Science (all)
- Condensed Matter Physics