Influence of Sulfide Dispersed in Lead-Free Bronze Casting on Electroplating
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- YASUDA Yoshinobu
- Northeastern Industrial Research Center of Shiga Prefecture Kansai University
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- ABE Hiroyuki
- Northeastern Industrial Research Center of Shiga Prefecture
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- YOSHII Hisamitsu
- Miyabe Iron Works Co. Ltd.
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- KODERA Yoshihito
- Koutoku Plating Industries Co. Ltd.
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- MATSUBAYASHI Ryozo
- Biwalite Co. Ltd.
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- MARUYAMA Toru
- Kansai University
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- HARUNA Takumi
- Kansai University
Bibliographic Information
- Other Title
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- 硫化物分散型鉛フリー銅合金中の硫化物が及ぼすめっきへの影響
- リュウカブツ ブンサンガタ ナマリ フリー ドウ ゴウキン チュウ ノ リュウカブツ ガ オヨボス メッキ エ ノ エイキョウ
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Abstract
<p>Recently, a newly developed lead-free bronze casting alloy was designated as CAC411 under Japanese Industrial Standards. CAC411 has a unique metallographic feature: tiny sulfide(Cu2S and ZnS)particles are dispersed in the bronze matrix, unlike conventional copper alloys. Earlier research results demonstrated that the sulfides have different electrochemical properties from those of the bronze matrix. At or under −1.20 V vs. Ag/AgCl, Cu2S suffered reduction and dissolution in neutral NaCl aqueous solution under cathodic polarization. The Cu2S dissolution reaction is regarded as affecting the alloy surface morphology in cathodic treatments such as electroplating. This study was conducted to elucidate effects of the sulfide on Cu-, Ni-, and Cr-electroplatings on CAC411. Results show that Cu-plating and Ni-plating affected the sulfide dissolution only slightly. Their plating surfaces were smooth and bright. However, the Cr-plated alloy surface was fogged. The fogged surface resulted from Cr cluster deposition on the sulfides. Presumably, the sulfide dissolved under the cathodic conditions was oxidized to HSO4- by Cr6+. The HSO4- behaved as catalyst for Cr deposition. Cu-plating or Ni-plating before the Cr-plating was found to be effective for obtaining a smooth and bright Cr-plating surface on CAC411.</p>
Journal
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- Journal of The Surface Finishing Society of Japan
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Journal of The Surface Finishing Society of Japan 68 (4), 201-207, 2017
The Surface Finishing Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204118407936
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- NII Article ID
- 130006602013
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- NII Book ID
- AN1005202X
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- ISSN
- 18843409
- 09151869
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- NDL BIB ID
- 028150054
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed