Electrochemistry of Zn(II)/Zn on Mg alloy from the N-butyl-N-methylpyrrolidinium dicyanamide ionic liquid
Electrochemistry of Zn(II)/Zn on Mg alloy from the N-butyl-N-methylpyrrolidinium dicyanamide ionic liquid
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DOI：
10.1016/j.electacta.2011.04.082
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发表时间：
2011-07-01
影响因子：
6.6
通讯作者：
Lu, Kueih-Tzu
中科院分区：
文献类型：
--
作者：
Deng, Ming-Jay;Lin, Pei-Chiung;Lu, Kueih-Tzu
研究了Zn(II)/Zn在含ZnCl2的室温离子液体n -丁基- n -甲基吡咯烷二氰胺（mp - dca）中在323 K下在玻碳电极（GC）和镁合金衬底上的电化学反应。安培滴定实验表明，Zn（II）与DCA阴离子反应形成[Zn(DCA)(3)]（-）络合物阴离子，也可通过一步电子转移过程还原为金属Zn。通过计时电流测量，在323 K的扩散控制下，Zn在GC和镁合金基体上的电沉积发生了三维瞬时成核。采用粉末x射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对锌矿床进行了系统表征。与在较高电流密度下沉积的锌层相比，在较低电流密度下沉积在镁合金基板上的锌层更加致密和均匀，因此，该涂层显示出对镁合金基板的腐蚀保护能力。(C) 2011 Elsevier Ltd.版权所有。
Electrochemical reaction of Zn(II)/Zn on glassy carbon electrode(GC) and Mg alloy substrates was investigated in the room-temperature ionic liquid, N-butyl-N-methyl-pyrrolidinium dicyanamide (BMP-DCA) containing ZnCl2 at 323 K. Amperometric titration experiments suggest that Zn(II) reacted with DCA anions forming [Zn(DCA)(3)](-) complex anion, which also could be reduced to Zn metal via a single-step electron transfer process. By chronoamperometric measurements, the electrodeposition of Zn on GC and Mg alloy substrates involved three-dimensional instantaneous nucleation under diffusion control at 323 K. The Zn deposits are also systematically characterized by the techniques of powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Zn layer deposited at a lower current density on Mg alloy substrates was more compact and uniform when compared to that deposited at a higher current density: consequently, this coating revealed a protection capability for the Mg substrate against corrosion. (C) 2011 Elsevier Ltd. All rights reserved.