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首页> 外文期刊>Journal of power sources >Inhibitive action of ferricyanide complex anion on both corrosion and passivation of zinc and zinc-nickel alloy in the alkaline solution
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Inhibitive action of ferricyanide complex anion on both corrosion and passivation of zinc and zinc-nickel alloy in the alkaline solution

机译：铁氰化物络合物阴离子对碱性溶液中锌和锌镍合金的腐蚀和钝化的抑制作用

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摘要

The corrosion of zinc and Zn-0.5Ni alloy in strong alkaline solution (7 M KOH) in the absence and presence of [Fe(CN)_6]~(-3) complex anion (1 × 10~(-3)-1 × 10~(-2) M) as inhibitor has been studied. Tafel plot, potentio-dynamic, potentiostatic and electrochemical impedance spectroscopy (EIS) techniques were used, and complementary by EDX and SEM investigation. It is observed that, the corrosion current density (I_(corr)) decreases, and the inhibition efficiency (IE%) increases as the concentration of inhibitor is increased. The shift of breakdown potential to less positive direction, indicating that the reduction of oxide layer on the alloy surface occurs somewhat easier in the presence of [Fe(CN)_6]~(3-) complex anion. The impedance measurements have shown that the increase of the inhibitor concentration in the alkaline solution reduces the corrosion rate in the active region. Accordingly, addition of [Fe(CN)_6]~(3-) complex anion to KOH solution can be considered as an important criteria for a good battery anodes. This behavior is due to its high negative open-circuit potential, less corrosion rate and higher self-catalysis in the passive region compared with those in its absence.
机译：在[Fe（CN）_6]〜（-3）配位阴离子（1×10〜（-3）-1）存在和存在下，强碱溶液（7 M KOH）中锌和Zn-0.5Ni合金的腐蚀研究了×10〜（-2）M）作为抑制剂。使用塔菲尔图，恒电位，恒电位和电化学阻抗谱（EIS）技术，并通过EDX和SEM研究进行补充。观察到，随着抑制剂浓度的增加，腐蚀电流密度（I_（corr））降低，并且抑制效率（IE％）增加。击穿电位向较弱的正方向移动，表明在[Fe（CN）_6]〜（3-）配位阴离子的存在下，合金表面氧化物层的还原变得容易一些。阻抗测量表明，碱性溶液中抑制剂浓度的增加降低了活性区域中的腐蚀速率。因此，向KOH溶液中添加[Fe（CN）_6]〜（3-）络合阴离子可被视为良好电池负极的重要标准。这种行为是由于与不存在时相比，其在被动区域中具有较高的负开路电势，较低的腐蚀速率和较高的自催化作用。

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