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貯氫合金V3TiNi0.56Mx耐腐蝕性能研究
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Investigation on the Corrosion Resistance of V3TiNi0.56Mx Hydrogen Storage Alloy in Alkaline Solution
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Supported by the Natural Science Foundation of China (CSTC 2007BB4140)

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    摘要:

    釩基固溶體貯氫合金在KOH電解質(zhì)溶液中容易腐蝕，導(dǎo)致合金的電化學(xué)循環(huán)穩(wěn)定性差，限制了釩基固溶體貯氫合金在Ni/MH電池中的應(yīng)用。通過測試貯氫合金V3TiNi0.56Mx(M=Al、Cr; x=0.1、0.3)在KOH溶液浸泡過程中組織結(jié)構(gòu)變化和腐蝕電位、交流阻抗譜等，研究了釩基固溶體貯氫合金V3TiNi0.56Mx的耐堿液腐蝕性能。結(jié)果表明：釩基固溶體貯氫合金在堿液中的腐蝕原因是作為導(dǎo)電集流體的TiNi第二相在KOH溶液中的不斷溶解；在合金V3TiNi0.56中添加Al和Cr元素，可阻止合金中分布于晶界的TiNi第二相的溶解，使合金的腐蝕電位提高，從而提高釩基固溶體貯氫合金的耐堿液腐蝕能力。

    Abstract:

    Vanadium-based hydrogen storage alloys are easily corroded in KOH solution, which leads to their poor electrochemical cyclic durability in alkaline solution and limits their application in the Ni/MH battery. In this paper, the structure transformation of V3TiNi0.56Mx alloys during full immersion corrosion in alkaline solution was investigated; the corrosion potentials, the Tafel curves and the impedance spectra were tested for the V3TiNi0.56Mx alloys in alkaline solution. The results show that the corrosion of V3TiNi0.56Mx alloys in alkaline solution is caused by the continuous dissolve of the TiNi compound based phase as a micro-current collector, and the addition of alloy elements Cr and Al can prevent the dissolve of TiNi compound based phase, shift the alloy corrosion potential and improve the corrosion resistance of alloys in alkaline solution.

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劉守平,田衛(wèi)國,劉志紅,劉小軍.貯氫合金V3TiNi0.56Mx耐腐蝕性能研究[J].稀有金屬材料與工程,2009,38(1):15~18.[Liu Shouping, Tian Weiguo, Liu Zhihong, Liu Xiaojun. Investigation on the Corrosion Resistance of V3TiNi0.56Mx Hydrogen Storage Alloy in Alkaline Solution[J]. Rare Metal Materials and Engineering,2009,38(1):15~18.]
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  • 收稿日期:2008-07-20
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