Formation and microstructure of nanoporous silver by dealloying rapidly solidified Zn–Ag alloys

► Nanoporous silver can be fabricated by electrochemical dealloying of Zn–Ag alloys. ► Phase constitution markedly affects electrochemical activities of Zn–Ag alloys. ► Formation of nanoporous silver is sensitive to the change of applied potentials. The electrochemical dealloying of rapidly solidifi...

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Published inElectrochimica acta Vol. 63; pp. 302 - 311
Main Authors Zhang, Chi, Sun, Junzhe, Xu, Junling, Wang, Xiaoguang, Ji, Hong, Zhao, Changchun, Zhang, Zhonghua
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 29.02.2012
Elsevier
Subjects
Alloys
Applied sciences
Corrosion
Corrosion mechanisms
Dealloying
Exact sciences and technology
Metals. Metallurgy
Nanocomposites
Nanomaterials
Nanoporous silver
Nanostructure
Potentiodynamic polarization
Potentiostatic polarization
Silver
Silver base alloys
Zinc base alloys
Zn–Ag alloys
Nanoporous silver
Potentiostatic polarization
Zn–Ag alloys
Potentiodynamic polarization
Dealloying
Zn-Ag alloys
Transition metal
Nanoporous materials
Potentiodynamic method
Corrosion
Silver alloy
Electrochemical polarization
Microstructure
Formation
Zinc alloy
Binary alloy
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Summary:► Nanoporous silver can be fabricated by electrochemical dealloying of Zn–Ag alloys. ► Phase constitution markedly affects electrochemical activities of Zn–Ag alloys. ► Formation of nanoporous silver is sensitive to the change of applied potentials. The electrochemical dealloying of rapidly solidified (RS) Zn–Ag alloys in a 5wt.% HCl solution and 1M NaCl solution has been investigated using electrochemical measurements and microstructural analysis. The results show that the electrochemical properties of the RS Zn–Ag alloys are associated not only with the alloy composition, but with the phase constitution of the alloys. Nanoporous silver (NPS) ribbons can be fabricated through potentiostatically dealloying the RS Zn–Ag alloys in both solutions. Moreover, a minor difference in the applied potential has a significant influence on the dealloying process and formation of NPS. The critical potential and polarization behavior of the Zn–Ag alloys have also been discussed, as well as surface diffusion of Ag adatoms.
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ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2011.12.103