| Corrosion behavior of Zr–Nb–Cr cladding alloys |
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| 基金项目： | Acknowledgments This work was financially supported by the State Key Laboratory for Advanced Metals and Materials （No. 2011Z-06）, the Fundamental Research Funds for the Central Universities （No. FRF-TP-11-002A）, and the National High-Tech R＆D Program of China （No. 2012AA03A507）. The authors are also grateful to Dr. Zhong-Kui Li at Northwest Institute for Nonferrous Metals Research for his help with the corrosion tests. |
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| 摘 要： | Zr-Nb-Cr alloys were used to evaluate the effects of alloying elements Nb and Cr on corrosion behavior of zirconium alloys. The microstructures of both Zr substrates and oxide films formed on zirconium alloys were characterized. Corrosion tests reveal that the corro- sion resistance of ZrxNb0.1Cr （x = 0.2, 0.5, 0.8, 1.1; wt%） alloys is first improved and then decreased with the increase of the Nb content. The best corrosion resistance can be obtained when the Nb concentration in the Zr matrix is nearly at the equilibrium solution, which is closely responsible for the formation of columnar oxide grains with protective characteristics. The Cr addition degrades the corrosion resistance of the Zrl.lNb alloy, which is ascribed to Zr（Cr,Fe,Nb）2 precipitates with a much larger size than β-Nb.
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| 关 键 词： | 锆合金 腐蚀行为 铬合金 铌 覆层 耐腐蚀性 抗腐蚀性能 合金元素 |
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