Effect of dispersed oxide of cerium, lanthanum and thorium on the corrosion behaviour of tungsten in 3.5 wt-% NaCl solution
Effect of dispersed oxide of cerium, lanthanum and thorium on the corrosion behaviour of tungsten in 3.5 wt-% NaCl solution
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DOI：
10.1080/1478422x.2023.2193777
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
L. Díaz-Ballote;V. Rejón;L. Maldonado;M. Alpuche‐Aviles;E. Vega-Lizama
中科院分区：
文献类型：
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作者：
L. Díaz-Ballote;V. Rejón;L. Maldonado;M. Alpuche‐Aviles;E. Vega-Lizama
钨具有独特的物理和化学性质，这使其成为高温应用的理想选择。在室温下，由于其被氧化物/氢氧化物薄膜保护，它正被考虑用于医疗应用。然而，氧化膜的破裂和钨的溶解可能会对人类健康产生不利影响。用电化学方法研究了钨在3wt-%的氯化钠溶液中的腐蚀行为。结果表明，钨的溶解是在钨和分散的氧化钨表面形成一层氧化膜后发生的。La_2O_3和CeO_2可以降低钨的腐蚀速率，而W_2O_2/W的腐蚀速率与W相似。研究认为，由于Th的放射性性质，CeO2或La2O3可以取代钨中的ThO2。
Tungsten has unique physical and chemical properties that make it ideal for high-temperature applications. At room temperature, it is being considered for medical applications due to its protection by an oxide/hydroxide film. However, breakdown of the oxide film and tungsten dissolution can have adverse effects on human health. This study investigates the corrosion of tungsten with and without dispersed oxides of rare-earth elements (ThO2, CeO2, and La2O3) in a 3 wt-% NaCl solution using electrochemical techniques. The results suggest that tungsten dissolution occurs after the formation of an oxide film, likely WO3, on the surface of tungsten and dispersed oxide tungsten. La2O3 and CeO2 may decrease the corrosion rate of tungsten, while WThO2/tungsten has similar corrosion rates to tungsten. The study concludes that CeO2 or La2O3 could replace ThO2 in tungsten due to the radioactive nature of Th.