Study on Corrosion Resistance of N36 Zirconium Alloy in LiOH Aqueous Solution

核科学与技术国际期刊(英文) Pub Date : 2018-03-30 DOI:10.4236/WJNST.2018.82004

Chao Sun, Z. Yang, Z. Wu

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引用次数: 8

Abstract

Zr-Sn-Nb-Fe alloys are one of the important directions for continuous improvement of zirconium alloys for high burn-up fuel assemblies. The corrosion resistance of Zr-Sn-Nb-Fe alloys is closely related to the alloying element and water chemical condition. To better understand the effect of Sn on corrosion resistance of Zr-Sn-Nb-Fe alloy, the normal N36 (Zr-1Sn-1Nb-0.3Fe) and low-tin N36 (Zr-0.8Sn-1Nb-0.3Fe) alloy sheets were prepared and tested in static autoclave in both of 0.01 mol/L LiOH and 0.03 mol/L LiOH aqueous solution at 360°C and 18.6 MPa. The characteristics of the microstructure and oxide film of alloys were analyzed by TEM and SEM respectively. It was shown that that the corrosion transition of the normal N36 appears earlier and the weight gain is higher than the low-tin N36 in two corrosive mediums. The cracks paralleling to the interface of oxide/metal are formed in the fracture surface of the oxide film and the micrographs at the oxide film/substrate interface appear uneven morphology. With the increasing of corrosion gain, there are more parallel cracks in oxide film and the uneven morphology at the oxide film/substrate interface is more obvious.

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N36锆合金在LiOH水溶液中的耐蚀性研究

Zr-Sn-Nb-Fe合金是高燃耗燃料组件用锆合金不断改进的重要方向之一。Zr-Sn-Nb-Fe合金的耐蚀性与合金元素和水化学条件密切相关。为了更好地了解Sn对Zr-Sn-Nb-Fe合金耐蚀性的影响，制备了普通N36 (Zr-1Sn-1Nb-0.3Fe)和低锡N36 (Zr-0.8Sn-1Nb-0.3Fe)合金板材，并在360℃、18.6 MPa、0.01 mol/L LiOH和0.03 mol/L LiOH水溶液中进行了静态高压釜测试。分别用透射电镜和扫描电镜分析了合金的显微组织和氧化膜特征。结果表明，在两种腐蚀介质中，正常N36的腐蚀转变出现得更早，增重量也高于低锡N36。氧化膜断裂面形成与氧化物/金属界面平行的裂纹，氧化膜/基体界面处显微形貌呈现不均匀形貌。随着腐蚀增益的增加，氧化膜中平行裂纹增多，氧化膜与基体界面处的不均匀形貌更加明显。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

核科学与技术国际期刊(英文)

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发文量

198