アルカリジンケート浴からの Zn − Ni 合金電析挙動に及ぼすエピクロルヒドリン−イミダゾール反応物の影響

Translated title of the contribution: Effect of reaction product of epichlorohydrin and imidazole on the electrodeposition behavior of Zn-Ni alloy from alkaline zincate solution

Seonghwa Bae, Satoshi Oue, In Joon Son, Hiroaki Nakano

Research output: Contribution to journalArticlepeer-review

Abstract

Electrodeposition of Zn-Ni alloy was performed on a Cu electrode at a current density of 10-5000 A·m−2 and a charge of 5 × 104 C·m−2 in an unagitated zincate solution at 293 K containing the reaction product of epichlorohydrin and imidazole as brightener. The effect of brightener on the deposition behavior of Zn-Ni alloy was investigated. The transfer current density at which the deposition behavior shifts from the normal type to anomalous was 50 to 100 A·m−2 in brightener-free solution, while it became 10 to 20 A·m−2 with an addition of brightener, indicating that the brightener greatly decreased the transfer current density. The transfer current density corresponded to the current density at which the potential of total polarization curve significantly shifted from the more noble region than the equilibrium potential of Zn to less noble region. With an addition of brightener, the decrease in transfer current density is attributed to suppression of hydrogen evolution, and the current efficiency for alloy deposition at high current density region decreased due to suppression of both Zn and Ni deposition. The Ni content of deposited films decreased with brightener, indicating that Ni deposition was more suppressed with brightener. With increasing current density, the crystals of films deposited from the solution containing brightener became smooth and showed the significant brightness. The oxidation reaction of films deposited from the solution containing brightener is suppressed, as a result, the corrosion potential shifted to noble direction.

Translated title of the contributionEffect of reaction product of epichlorohydrin and imidazole on the electrodeposition behavior of Zn-Ni alloy from alkaline zincate solution
Original languageJapanese
Pages (from-to)226-236
Number of pages11
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume107
Issue number3
DOIs
Publication statusPublished - Mar 1 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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