| Zr-Sn-Nb合金I-SCC腐蚀产物研究 |
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| 引用本文： | 彭倩,李卫军,唐正华,崔旭梅,衡雪梅.Zr-Sn-Nb合金I-SCC腐蚀产物研究[J].核动力工程,2003,24(4):312-316. |
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| 作者姓名： | 彭倩 李卫军 唐正华 崔旭梅 衡雪梅 |
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| 作者单位： | 1. 中国核动力研究设计院核燃料及材料国家重点实验室,成都,610041
2. 四川大学材料科学与工程学院,成都,610065 |
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| 基金项目： | 核燃料及材料国家重点实验室基金资助项目(00JS85.1.1.ZS8501) |
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| 摘 要： | 利用SEM和EDXA对Zr-Sn-Nb合金碘致应力腐蚀断口上的腐蚀产物进行了观察分析。结果表明：腐蚀产物的成分主要是氧和锆，只有局部准解理断裂区域可检测到碘，碘与氧在锆基体上竞争吸附，形成不具保护作用的膜．促进局部严重氧化；应力、碘分压、合金成分及热处理状态等因素会影响腐蚀产物的特征，这些影响作用与碘的扩散、合金中第二相的数量以及Zr-I-O体系的化学平衡有关。
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| 关 键 词： | Zr－Sn－Nb合金 碘致应力腐蚀开裂 腐蚀产物 |
| 文章编号： | 0258-0926(2003)04-0312-05 |
| 修稿时间： | 2003年1月8日 |
A Study on the Corrosion Products on I-SCC Fracture of Zr-Sn-Nb Alloys |
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| PENG Qian,LI Wei-jun,TANG Zheng-hua,CUI Xu-mei,HENG Xue-mei.A Study on the Corrosion Products on I-SCC Fracture of Zr-Sn-Nb Alloys[J].Nuclear Power Engineering,2003,24(4):312-316. |
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| Authors: | PENG Qian LI Wei-jun TANG Zheng-hua CUI Xu-mei HENG Xue-mei |
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| Affiliation: | PENG Qian1,LI Wei-jun1,TANG Zheng-hua2,CUI Xu-mei2,HENG Xue-mei2 |
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| Abstract: | The corrosion products on the I-SCC fracture of Zr-Sn-Nb alloys have been investigated by SEM and EDXA. The result shows that, the products are mainly composed of Zr and O; and I can only be detected on the local pseud-cleavage zone. The adsorption of iodine at bare metal surface would be competing with that of oxygen. This could lead to the formation of a non-protective film and thus promote locally serious oxidation in test atmosphere. The stress, iodine partial pressure, composition of alloys and heat-treatment state would influence the morphology and thickness of the corrosion products, which can be explained by the diffusion of iodine, the quantities of precipitation particles or the reaction balance of Zr-I-O system. |
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| Keywords: | Zr-Sn-Nb alloy Iodine induced stress corrosion cracking Corrosion product |
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