Electrochemistry of Zn(II)/Zn on Mg alloy from the N-butyl-N- methylpyrrolidinium dicyanamide ionic liquid

Ming Jay Deng*, Pei Chiung Lin, Jeng-Kuei Chang, Jin Ming Chen, Kueih Tzu Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish
Pages (from-to)6071-6077
Number of pages7
JournalElectrochimica Acta
Issue number17
StatePublished - 1 Jul 2011


  • AZ91D
  • Corrosion
  • Dicyanamide
  • Electrodeposition
  • Ionic liquid
  • Zn


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