Ellipsometric Study of the Initial Layer Formation of the Preferential Zn deposition in Zn-Ni Electroplating
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概要
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The initial layer formation of Zn, Ni, and Zn-Ni deposition on Au electrode in sulfate bath has been investigated by three-parameter ellipsometry. The formation of deposited layer has been monitored by the <I>in-situ</I> optical method in the thickness range of nm with the complex refractive index of the layer.The underpotential deposition (UPD) of Zn is observed from the change of ellipsometric parameters and the Zn deposition is found to start in the UPD potential region more positive than 0.5 V than the redox potential of Zn<SUP>2+</SUP>/Zn. The Ni deposition is strongly inhibited by the presence of Zn<SUP>2+</SUP> ion. It is suggested that the thin layer of Zn initially formed in the UPD potential region inhibits the Ni deposition. The inhibition by the thin surface layer of Zn, which is preferentially formed, is thought to occur also on the growing Zn-Ni electrodeposited alloy. It is, therefore, speculated that the preferential deposition of Zn in the Zn-Ni codeposition process is caused by the thin Zn layer on the deposited Zn-Ni alloy.
- 社団法人 日本鉄鋼協会の論文
- 1995-07-15
著者
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Uchida Tetsuo
Department Of Applied Chemistry Nagoya Institute Of Technology
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Ohtsuka Toshiaki
Department Of Applied Chemistry Nagoya Institute Of Technology
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Komori Akira
Department Of Applied Chemistry Nagoya Institute Of Technology
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KUWAMURA Emi
Department of Applied Chemistry, Nagoya Institute of Technology
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Kuwamura Emi
Department Of Applied Chemistry Nagoya Institute Of Technology
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Uchida Tetsuo
Department of Applied Chemistry, Nagoya Institute of Technology
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