Dissolution Behavior of Silver Anode in Cyanide Free Bath

The cyanide-free silver plating bath that we developed produced good silver film, but the cell voltage of the bath increased over time if electrodeposition was conducted continuously. Green film also formed on the silver anode with increasing voltage. To clarify these phenomena, we studied the anodi...

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Published inHyōmen gijutsu Vol. 49; no. 3; pp. 320 - 322
Main Authors MASAKI, Seishi, KONDO, Tetsuya, INOUE, Hiroyuki, HONMA, Hideo
Format Journal Article
LanguageEnglish
Japanese
Published Tokyo The Surface Finishing Society of Japan 01.03.1998
Japan Science and Technology Agency
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Abstract The cyanide-free silver plating bath that we developed produced good silver film, but the cell voltage of the bath increased over time if electrodeposition was conducted continuously. Green film also formed on the silver anode with increasing voltage. To clarify these phenomena, we studied the anodic polarization behavior of the silver electrode in the cyanide-free bath. The X-ray diffraction pattern for the green film agreed with that of AgI. Anodic polarization curves for the silver electrode indicated that less-conductive film formed on the electrode when the potential exceeded-0.3V. The polarization curve limiting current was increased by agitating the bath or increasing KI concentration. These results iudicate that Ag was dissolved into the solution via AgI rather than dissolving directly into the bath.
AbstractList The cyanide-free silver plating bath that we developed produced good silver film, but the cell voltage of the bath increased over time if electrodeposition was conducted continuously. Green film also formed on the Ag anode with increasing voltage. To clarify these phenomena, we studied the anodic polarization behavior of the Ag electrode in the cyanide-free bath. The x-ray diffraction pattern for the green film agreed with that of AgI. Anodic polarization curves for the Ag electrode indicated that less-conductive film formed on the electrode when the potential exceeded -0.3 V. The polarization curve limiting current was increased by agitating the bath or increasing KI concentration. These results indicate that Ag was dissolved into the solution via AgI rather than dissolving directly into the bath.
The cyanide-free silver plating bath that we developed produced good silver film, but the cell voltage of the bath increased over time if electrodeposition was conducted continuously. Green film also formed on the silver anode with increasing voltage. To clarify these phenomena, we studied the anodic polarization behavior of the silver electrode in the cyanide-free bath. The X-ray diffraction pattern for the green film agreed with that of AgI. Anodic polarization curves for the silver electrode indicated that less-conductive film formed on the electrode when the potential exceeded-0.3V. The polarization curve limiting current was increased by agitating the bath or increasing KI concentration. These results iudicate that Ag was dissolved into the solution via AgI rather than dissolving directly into the bath.
Author MASAKI, Seishi
KONDO, Tetsuya
INOUE, Hiroyuki
HONMA, Hideo
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  fullname: INOUE, Hiroyuki
  organization: College of Eng. Osaka Pref. Univ
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  fullname: HONMA, Hideo
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References 2) 井上博之, 山川宏二, 正木征史; 表面技術, 43, 478 (1992
3) 井上博之, 山川宏二, 正木征史; 表面技術, 44, 55 (1993
4) 正木征史, 吉本雅一, 井上博之, 本間英夫; 表面技術, 49, 84 (1998
1) 近藤哲也, 正木征史, 井上博之, 山川宏二; 表面技術, 42, 241 (1991
5) 正木征史, 吉本雅一, 田中恵美子, 井上博之, 本間英夫; 表面技術, 49, 201 (1998
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SubjectTerms Anodic Dissolution
Cyanide Free Silver Electroplating
Title Dissolution Behavior of Silver Anode in Cyanide Free Bath
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