Whisker Growth from Zinc Plating versus Chemical Species in Baths.

• OHKAWARA Kaoru

  Fukushima Technology Centre

• MUROI Ryoichi

  Sambix Co., Ltd.

Bibliographic Information

Other Title

• 亜鉛めっきのホイスカー発生と浴中化学種の関係
• アエン メッキ ノ ホイスカー ハッセイ ト ヨクチュウ カガクシュ ノ カン

Abstract

High concentrations of cyanide and alkali in baths had the objective of lowering whisker growth in zinc plating, but the mechanism and suitable bath composition remain to be clarified.<br>We studied chemical species concentrations, taking the ion balance into consideration, and found that the carbon content in zinc plating, and the amount of zinc cyanide complexes and free cyanide ions in baths are related to whisker growth. Zincate ions are related to the electrodeposition rate but not to whisker growth. The ratio of zincate ion to zinc cyanide complexes in the cyanide system we studied, is closer to the work of Hasko and Kunkel indicated in the standard cyanide system [Zn(OH)₄^2-]:[Zn(CN)₄^2-]≅1:1; in the highcyanide system [Zn(OH)₄^2-]:[ZnCN]₄^2-]≅1:2-3) than to the work of Hull and Wernlund indicated (75 to 90% of zinc in the standard cyanide system was present as zincate ion and the remainder as zinc cyanide complexes).<br>This concentration of chemical species can be used as an index of zinc plating baths control instead of ratio M (NaCN/Zn).

Journal

• Journal of The Surface Finishing Society of Japan

  Journal of The Surface Finishing Society of Japan 49 (5), 502-506, 1998

  The Surface Finishing Society of Japan

Keywords

• Zinc Plating
• Whisker
• Cyanide Baths
• Chemical Species
• Carbon Content

Details

• CRID: 1390001204114387968
• NII Article ID: 10002109313
• NII Book ID: AN1005202X
• DOI: 10.4139/sfj.49.502
• COI: 1:CAS:528:DyaK1cXjtFGjtb0%3D
• ISSN: 18843409
• ISSN: 09151869
• ISSN: http://id.crossref.org/issn/09151869
• NDL BIB ID: 4481829
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4481829
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed