Electrodeposition of Chromium from Divalent Chromium Baths Containing Formic Acid.

• HIRATO Tetsuji

  Dept. of Materials Sci. and Eng., Kyoto Univ.

• TERABATAKE Tomomichi

  Graduate Student, Kyoto Univ. Present: Kawasaki Steel Corp.

• WATANABE Eiichiro

  Graduate Student, Kyoto Univ. Present: The Science and Technology Agency

• AWAKURA Yasuhiro

  Dept. of Materials Sci. and Eng., Kyoto Univ.

Bibliographic Information

Other Title

• ギ酸を含む２価クロム電解浴からのクロム電析
• ギサン オ フクム 2カ クロム デンカイヨク カラ ノ クロム デンセキ

Abstract

The electrodeposition of chromium from divalent chromium based baths has not been thoroughly investigated, due to the highly transient and unstable nature of Cr (II) ions. The electrodeposition of chromium from a variety of divalent chromium baths was examined to establish conditions suitable for chromium plating. Divalent chromium baths were prepared by electrolytic reduction of aqueous Cr₂(SO₄)₃ solution using a titanium cathode. Lustrous chromium deposition was obtained by electrodeposition at a cathode potential of -1.1V vs SHE, using aqueous 0.8kmol m^-3 CrSO₄ -2.0kmol m^-3 KCl-0.1kmol m^-3 HCOOH (pH 1.8). For 30min of deposition, the average current efficiency for chromium deposition was 25.4%. The average deposit thickness was 10.8μm. The HCOOH concentration suitable for chromium deposition from divalent chromium baths, is much lower than that from trivalent chromium bathes. The main role of the organic acid is to control the pH in the vicinity of the cathode surface.

Journal

• Journal of The Surface Finishing Society of Japan

  Journal of The Surface Finishing Society of Japan 47 (3), 245-249, 1996

  The Surface Finishing Society of Japan

Keywords

• Chromium Plating
• Electrodeposition
• Divalent Chromium Ion
• Formic Acid
• Chromous Sulfate

Details

• CRID: 1390282679090465536
• NII Article ID: 10002255877
• NII Book ID: AN1005202X
• DOI: 10.4139/sfj.47.245
• COI: 1:CAS:528:DyaK28XhvFCqtb0%3D
• ISSN: 18843409
• ISSN: 09151869
• NDL BIB ID: 3936738
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3936738
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed