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

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    3 Citations (Scopus)

    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 - 2018

    All Science Journal Classification (ASJC) codes

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

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