Electrodeposition behavior of Zn-Co alloys from an alkaline zincate solution containing triethanolamine

Hiroaki Nakano, Shitoku Shibata, Shingo Arakawa, Satoshi Oue, Shigeo Kobayashi

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Electrodeposition behavior of Zn-Co alloys was investigated at current densities of 2-500 A·m?2 and a charge of 5 × 104 C·m?2 at 308 K in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Co2+ ions. At current densities lower than 5 A·m?2, the Zn-Co alloys exhibited normal co-deposition behavior, with the electrochemically more noble Co being preferentially deposited. By contrast, at current densities higher than 6 A·m?2, they exhibited anomalous co-deposition behavior, with the electrochemically less noble Zn being preferentially deposited. The current efficiency for Zn-Co alloy deposition was low (about 20%) in the normal co-deposition region, while it was 95% in the anomalous co-deposition region. Also, in the anomalous co-deposition region, the partial polarization curves for Co deposition and H2 evolution were significantly shifted to the less noble direction by the coexistence of Zn2+ ions, suggesting the formation of an inhibitor species that results from the presence of Zn 2+ ions in the cathode layer. On the other hand, in the normal co-deposition region, the underpotential deposition of Zn apparently occured simultaneously with Co deposition. Zn-Co alloys are composed of stable intermetallic compounds CoZn13 and Co5Zn21; therefore, the activity coefficient of Zn in the deposits appears to decrease remarkably.

元の言語英語
ページ(範囲)1858-1863
ページ数6
ジャーナルisij international
53
発行部数10
DOI
出版物ステータス出版済み - 11 18 2013

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Triethanolamine
Electrodeposition
Current density
Ions
triethanolamine
Activity coefficients
Intermetallics
Cathodes
Deposits
Polarization

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

Electrodeposition behavior of Zn-Co alloys from an alkaline zincate solution containing triethanolamine. / Nakano, Hiroaki; Shibata, Shitoku; Arakawa, Shingo; Oue, Satoshi; Kobayashi, Shigeo.

:: isij international, 巻 53, 番号 10, 18.11.2013, p. 1858-1863.

研究成果: ジャーナルへの寄稿記事

Nakano, Hiroaki ; Shibata, Shitoku ; Arakawa, Shingo ; Oue, Satoshi ; Kobayashi, Shigeo. / Electrodeposition behavior of Zn-Co alloys from an alkaline zincate solution containing triethanolamine. :: isij international. 2013 ; 巻 53, 番号 10. pp. 1858-1863.
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abstract = "Electrodeposition behavior of Zn-Co alloys was investigated at current densities of 2-500 A·m?2 and a charge of 5 × 104 C·m?2 at 308 K in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Co2+ ions. At current densities lower than 5 A·m?2, the Zn-Co alloys exhibited normal co-deposition behavior, with the electrochemically more noble Co being preferentially deposited. By contrast, at current densities higher than 6 A·m?2, they exhibited anomalous co-deposition behavior, with the electrochemically less noble Zn being preferentially deposited. The current efficiency for Zn-Co alloy deposition was low (about 20{\%}) in the normal co-deposition region, while it was 95{\%} in the anomalous co-deposition region. Also, in the anomalous co-deposition region, the partial polarization curves for Co deposition and H2 evolution were significantly shifted to the less noble direction by the coexistence of Zn2+ ions, suggesting the formation of an inhibitor species that results from the presence of Zn 2+ ions in the cathode layer. On the other hand, in the normal co-deposition region, the underpotential deposition of Zn apparently occured simultaneously with Co deposition. Zn-Co alloys are composed of stable intermetallic compounds CoZn13 and Co5Zn21; therefore, the activity coefficient of Zn in the deposits appears to decrease remarkably.",
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