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Preparation of Mg-Yb alloy film by electrolysis in the molten LiCl-KCl-YbCl3 system at low temperature
- Source :
- Journal of Rare Earths. 28:128-133
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- The electrochemical behavior of Yb3+ and electrodeposition of Mg-Yb alloy film at solid magnesium cathode in the molten LiCl-KCl-YbCl3 (2 wt.%) system at 773 K was investigated. Transient electrochemical techniques, such as cyclic voltammetry, chronopotentiometry and chronoamperometry were used in order to explore the deposition mechanism of Yb. The reduction process of Yb3+ is stepwise reactions which are single-electron and double-electron reversible charge transfer reactions. The speed control step was a diffusion-controlled step which is caused by concentration polarization. The microstructures of Mg-Yb alloy film were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and EPMA area analysis. A very thin Mg2Yb alloy film (∼200 nm) was formed by potentiostatic electrolysis at −1.85 V (vs. Ag/AgCl) for 12 h. A much thicker Mg2Yb alloy film (∼450 μm) was obtained at −2.50 V (vs. Ag/AgCl) for 2.5 h. The corrosion resistance of magnesium can be enhanced by electrochemical formation of Mg-Yb alloy film on its surface.
- Subjects :
- Electrolysis
Materials science
Scanning electron microscope
Magnesium
Alloy
Metallurgy
Analytical chemistry
chemistry.chemical_element
General Chemistry
engineering.material
Chronoamperometry
Electrochemistry
law.invention
chemistry
Geochemistry and Petrology
law
engineering
Molten salt
Cyclic voltammetry
Subjects
Details
- ISSN :
- 10020721
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Journal of Rare Earths
- Accession number :
- edsair.doi...........0af279cba9548ea0f5f2067ce8b8649b
- Full Text :
- https://doi.org/10.1016/s1002-0721(09)60065-x