Abstract
The kinetics of anodic dissolution of Zr in hydrofluoric acid (HF) was investigated using potentiodynamic polarization experiments. At lower potentials, an active region with a rapid increase in current with the potential was observed and at higher potentials, a large passivation current plateau was observed. The current decreased only slightly with potential in the passive region. Scanning electron micrographs confirmed that the passivation is incomplete in the region where current exhibits a plateau and x-ray photoelectron spectroscopic analysis showed that oxides and oxyfluorides are present on the surface. A four-step mechanism with two adsorbed intermediate species was evaluated and the model captures the essential characteristics of the polarization plots. The results suggest that \( {HF}_2^{-} \) species participates in the chemical dissolution step and actual HF participates in the electrochemical dissolution step.
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Acknowledgments
The authors thank the Department of Science and Technology, India, for providing the SEM facility to the Department of Chemical Engineering, Indian Institute of Technology Madras through the FIST program; Prof. M. Kamaraj, Department of Metallurgical and Materials Engineering, IIT-Madras, for the grain structure image; and Dr. U. Kamachi Mudali and Dr. Rani P. George, CSTG, IGCAR, Kalpakkam for the XPS analysis.
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Amrutha, M.S., Srinivasan, R. Kinetics of anodic dissolution of Zr in acidic fluoride media. J Solid State Electrochem 21, 91–102 (2017). https://doi.org/10.1007/s10008-016-3342-0
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DOI: https://doi.org/10.1007/s10008-016-3342-0