トリエタノールアミンを含むジンケート浴からの Zn-Fe 合金電析挙動

• 中野 博昭

  九州大学大学院工学研究院材料工学部門

• 荒川 真吾

  九州大学大学院工学府物質プロセス工学専攻

• 大上 悟

  九州大学大学院工学研究院材料工学部門

• 小林 繁夫

  九州産業大学工学部物質生命化学科

書誌事項

タイトル別名

• Electrodeposition Behavior of Zn-Fe Alloy from Zincate Solution Containing Triethanolamine
• トリエタノールアミン オ フクム ジンケートヨク カラ ノ Zn-Fe ゴウキンデンセキキョドウ

抄録

  Electrodeposition behavior of Zn-Fe alloys was investigated at current densities of 10-500 A•m⁻² and a charge of 5×10⁴ C•m⁻² in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Fe²⁺ ions at 308 K. The content of Fe in deposit changed significantly depending on the current density. At lower current densities than 20 A•m⁻², the content of Fe was approximately 90 mass%, that is, the Zn-Fe alloy exhibited normal codeposition, wherein electrochemically more noble Fe deposited preferentially, while at higher current densities than 100 A•m⁻², it exhibited anomalous codeposition, wherein less noble Zn deposited preferentially. The current density, at which the content of Fe in deposit changed significantly, corresponded to the one, at which the cathode potential in total polarization curve abruptly shifted to the less noble region than the equilibrium potential for Zn deposition. Iron deposition and H₂ evolution were significantly suppressed in the region of anomalous codeposition at higher current densities, showing the formation of an inhibitor for deposition, which results from Zn²⁺ ions in the cathode layer. The current efficiency for alloy deposition was not close to zero even in the region of normal codeposition, and the content of Fe in the region of anomalous codeposition was close to the composition reference line, which shows the different deposition behavior from the sulfate solutions. In the region of normal codeposition at lower current densities, the underpotential deposition of Zn occurred with Fe. TEM analysis revealed that Zn-Fe alloys deposited at lower current densities were composed of a stable intermetallic compound of Fe₅Zn₂₁. The activity coefficient of Zn in the deposit appears to decrease remarkably because of the formation of a stable Fe₅Zn₂₁.<br>

収録刊行物

• 日本金属学会誌

  日本金属学会誌 79 (5), 243-248, 2015

  公益社団法人 日本金属学会

キーワード

• zincate
• zinc-iron alloys
• electrodeposition
• underpotential deposition
• anomalous codeposition
• current efficiency
• normal codeposition
• cathode potential
• current density

詳細情報

• CRID: 1390282681457736832
• NII論文ID: 130005067083
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet.j2014054
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 026397008
• Web Site: http://id.ndl.go.jp/bib/026397008
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026397008
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/79/5/79_J2014054/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可