Electrodeposition behavior of Zn-polyethyleneimine composite from sulfate solution and its micro structure

Kousuke Fuchi, Satoshi Oue, Yoshiharu Kikuchi, Shinya Akamatsu, Yuki Kashiwa, Hiroaki Nakano

Research output: Contribution to journalArticle

Abstract

Electrodeposition of Zn-polyethyleneimine composite was performed at current density of 100-12000 A.m-2 and a charge of 4.8 × 105 C.m-2 in an agitated sulfate solution containing 1.84 mol.dm-3 of ZnSO4 and 4 g.dm-3 of polyethyleneimine at pH 1.8 and at 313 K, and the deposition behavior and its micro structure were investigated. The films deposited at current densities above 4000 A.m-2 from the solution containing polyethyleneimine exhibited the gloss, and the gloss was highest with polyethyleneimine of higher molecular weight of 70000. The preferred orientation of deposited Zn changed from {0001} to {1120} and {1010} with polyethyleneimine, and the size of Zn platelet crystals deceased with increasing the molecular weight of polyethyleneimine and current density. The deposition of Zn was polarized with polyethyleneimine, and the degree of polarization became larger at higher current density region with polyethyleneimine of higher molecular weight of 70000. With increasing the molecular weight of polyethyleneimine and current density, the content of C and N in deposited films increased, indicating the increase in adsorption ability of polyethyleneimine onto cathode. Polyethyleneimine somewhat suppressed the rise of pH at cathode layer during deposition, or showed the buffer action of pH. During deposition, H+ ions are detached from the polyethyleneimine due to rise of pH at cathode layer and, as a result, the lone pairs of electron in N atom increased, which resulted in increase in adsorption ability of polyethyleneimine onto cathode.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume82
Issue number8
DOIs
Publication statusPublished - Jan 1 2018

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Polyethyleneimine
Electrodeposition
electrodeposition
Sulfates
sulfates
Current density
current density
molecular weight
Cathodes
microstructure
Microstructure
cathodes
Molecular weight
composite materials
Composite materials
Adsorption
adsorption
Platelets
platelets
high current

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Electrodeposition behavior of Zn-polyethyleneimine composite from sulfate solution and its micro structure. / Fuchi, Kousuke; Oue, Satoshi; Kikuchi, Yoshiharu; Akamatsu, Shinya; Kashiwa, Yuki; Nakano, Hiroaki.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 82, No. 8, 01.01.2018, p. 281-288.

Research output: Contribution to journalArticle

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