Electrochemical properties and dissolution of UPd₃ in nitric acid solutions

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• 作者：S. V. Zavarzin ; A. G. Maslennikov ; K. N. Gedgovd ; G. S. Bulatov…
• 关键词：uranium ; palladium ; intermetallic compounds ; electrochemical behavior ; chemical dissolution
• 刊名：Radiochemistry
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：58
• 期：5
• 页码：466-472
• 全文大小：682 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nuclear Chemistry
  Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3288
• 卷排序：58

文摘

Electrochemical properties of the intermetallic compound UPd₃ in 0.5–8 M HNO₃ solutions were studied by linear voltammetry. In 0.5–2 M HNO₃ solutions, the UPd₃ surface is in the passive state. At HNO₃ concentrations exceeding 4 M, the alloy passivation was not observed. The previously unknown electrochemical characteristics of UPd₃ in nitric acid solutions were obtained using the Tafel equation. The values of Е(i = 0) and v_corr increased from 39 mV and 38 μg cm–2 h–1 in 0.5 M HNO₃ to 821 mV and 11 mg cm–2 h–1 in 8 M HNO₃, respectively. Dissolution experiments have shown that UPd₃ can dissolve in HNO₃ solutions of concentration exceeding 4 M at room temperature. In 8 M HNO₃, the dissolution rate can reach 17 mg cm–2 h–1 at 25°С, with the dissolution being virtually equimolar and accelerating with time.