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钒基固溶体贮氢合金在KOH电解质溶液中容易腐蚀,导致合金的电化学循环稳定性差,限制了钒基固溶体贮氢合金在Ni/MH电池中的应用。通过测试贮氢合金V3TiNi0.56Mx(M=Al、Cr;x=0.1、0.3)在KOH溶液浸泡过程中组织结构变化和腐蚀电位、交流阻抗谱等,研究了钒基固溶体贮氢合金V3TiNi0.56Mx的耐碱液腐蚀性能。结果表明:钒基固溶体贮氢合金在碱液中的腐蚀原因是作为导电集流体的TiNi第二相在KOH溶液中的不断溶解;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,使合金的腐蚀电位提高,从而提高钒基固溶体贮氢合金的耐碱液腐蚀能力。
Vanadium-based solid solution hydrogen storage alloys easily corroded in KOH electrolyte solution, resulting in poor electrochemical cycling stability of the alloy, limiting the application of vanadium-based solid solution hydrogen storage alloys in Ni / MH batteries. The change of structure, corrosion potential and AC impedance of V3TiNi0.56Mx (M = Al, Cr; x = 0.1,0.3) during the soaking of KOH solution were studied. The effects of vanadium-based solid solution hydrogen storage alloy V3TiNi0.56Mx Alkali solution corrosion. The results show that the corrosion of vanadium-based solid solution hydrogen storage alloy in alkaline solution is due to the continuous dissolution of TiNi second phase in KOH solution as the current collector. Adding Al and Cr into V3TiNi0.56 alloy can prevent the corrosion of vanadium- The dissolution of the second phase of TiNi distributed in the grain boundaries increases the corrosion potential of the alloy and improves the alkali-resistant liquid corrosion resistance of the vanadium-based solid solution hydrogen storage alloy.