Corrosion-Resistant Ti-xNb-xZr Alloys for Nitric Acid Applications in Spent Nuclear Fuel Reprocessing Plants
Corrosion-Resistant Ti-xNb-xZr Alloys for Nitric Acid Applications in Spent Nuclear Fuel Reprocessing Plants
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DOI：
10.1007/s11661-011-0701-4
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发表时间：
2011-04
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影响因子：
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通讯作者：
Geetha Manivasagam;V. Anbarasan;U. Kamachi Mudali;B. Raj
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作者：
Geetha Manivasagam;V. Anbarasan;U. Kamachi Mudali;B. Raj
本文报道了两种新型合金Ti-4Nb-4Zr和Ti-2Nb-2Zr在沸腾硝酸环境中的发展、显微组织和腐蚀行为。在11.5M硝酸的液相、汽相和冷凝相中进行了腐蚀试验，并在室温下对两种合金进行了动电位极化研究。用扫描电子显微镜(SEM)和能量色散X射线微区分析(EDAX)对三相腐蚀试验样品进行了表征。由于与Ti-4Nb-4Zr相比，Ti-2Nb-2Zr合金在这三个相中表现出较差的腐蚀行为，因此只对Ti-4Nb-4Zr合金进行了焊接性和热处理研究。使用钨极惰性气体保护焊(TIG)工艺对新合金的焊接性进行了评估，然后对焊接试件进行了三个阶段的腐蚀行为测试。研究结果表明，与用于乏核后处理厂硝酸的常规合金相比，新开发的近αTi-4Nb-4Zr合金在所有三种相中都具有优异的耐腐蚀性和良好的焊接性。此外，贝塔热处理的Ti-4Nb-4Zr合金的耐腐蚀性优于在α+β相热处理的样品。
This article reports the development, microstructure, and corrosion behavior of two new alloys such as Ti-4Nb-4Zr and Ti-2Nb-2Zr in boiling nitric acid environment. The corrosion test was carried out in the liquid, vapor, and condensate phases of 11.5 M nitric acid, and the potentiodynamic anodic polarization studies were performed at room temperature for both alloys. The samples subjected to three-phase corrosion testing were characterized using scanning electron microscopy (SEM) and energy-dispersive X-ray microanalysis (EDAX). As Ti-2Nb-2Zr alloy exhibited inferior corrosion behavior in comparison to Ti-4Nb-4Zr in all three phases, weldability and heat treatment studies were carried out only on Ti-4Nb-4Zr alloy. The weldability of the new alloy was evaluated using tungsten inert gas (TIG) welding processes, and the welded specimen was thereafter tested for its corrosion behavior in all three phases. The results of the present investigation revealed that the newly developed near alpha Ti-4Nb-4Zr alloy possessed superior corrosion resistance in all three phases and excellent weldability compared to conventional alloys used for nitric acid application in spent nuclear reprocessing plants. Further, the corrosion resistance of the beta heat-treated Ti-4Nb-4Zr alloy was superior when compared to the sample heat treated in the alpha + beta phase.