Effect of bromide ions on the corrosion behavior of tantalum in anhydrous ethanol |
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Authors: | Haiping Yang Yanan Cai Motang Tang |
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Affiliation: | a School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China b School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China |
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Abstract: | The electrochemical behaviors of Ta in Et4NBr ethanol solutions were investigated using potentiodynamic polarization, cyclic voltammetry, potentiostatic current-time transient and impedance techniques. The potentiodynamic anodic polarization curves did not exhibit active dissolution region due to the presence of thin oxide film on the electrode surface, which was followed by pitting corrosion as a result of passivity breakdown by the aggressive attack of Br− anions. The pitting potential (Eb) decreased with the increase of solution temperature and Br− concentration, but increased with increasing potential scan rate and water concentration. The incubation time derived from potentiostatic current-time transients decreased with increasing potentials. The impedance spectra exhibited two time constants for all the potentials and the resistance of passive layer decreased with increasing potential. |
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Keywords: | EIS Electrochemical Et4NBr Tantalum Pitting corrosion |
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