抄録
To investigate the effect of impurities in solution on the lightness, surface morphology and current efficiency of deposited Ni, Ni electrodeposition was performed at a current density of 300 A/m 2 and 7.2×10 5 C·m -2 of charge, in an unagitated chloride solution containing Mn 2+ , Cr 3+ and SO 4 2- ions as impurity with pH 1 to 3, at 333 K. In solution containing 10 g·dm -3 of Mn 2+ , the current efficiency for Ni deposition decreased slightly, and crystal size of deposited Ni became small. The lightness of deposited Ni decreased when the concentration of Mn 2+ exceeded 1 g·dm -3 . When the Ni deposition was performed using soluble Ni anode to prevent the formation of MnO 2 at anode, the lightness of Ni was higher than that using insoluble anode, which suggesting that MnO 2 resulting from insoluble anode caused the decrease in lightness of Ni. In solution containing Cr 3+ , the current efficiency of Ni gradually decreased with increasing concentration of Cr 3+ , and significantly decreased above the Cr 3+ concentration of 0.1 g·dm -3 . The lightness of deposited Ni greatly decreased with increasing concentration of Cr 3+ above 0.001 g·dm -3 . In solution containing Cr 3+ , it is presumed that Cr(OH) 3 formed at cathode layer suppresses the Ni deposition, resulting in some codeposition of NiO and Ni(OH) 2 with Ni, which causes the decrease in current efficiency and lightness of Ni. On the other hand, in solution containing SO 4 2- , the current efficiency of Ni somewhat decreased at SO 4 2- concentration above 50 g·dm -3 , and significantly decreased above 100 g·dm -3 . The lightness of deposited Ni somewhat increased at SO 4 2- concentration of 20 g·dm -3 , and greatly increased above 20 g·dm -3 . Since the overpotential for Ni deposition increases with increasing concentration of SO 4 2- , the surface of deposited Ni becomes smooth, resulting in increase in lightness.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 539-545 |
| ページ数 | 7 |
| ジャーナル | Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals |
| 巻 | 80 |
| 発行部数 | 8 |
| DOI | |
| 出版物ステータス | 出版済み - 1 1 2016 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry
これを引用
Effect of impurities in solution on the lightness and surface morphology of Ni deposited from chloride electro-winning solutions. / Sato, Yuki; Oue, Satoshi; Heguri, Shinichi; Nakano, Hiroaki.
：: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 巻 80, 番号 8, 01.01.2016, p. 539-545.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Effect of impurities in solution on the lightness and surface morphology of Ni deposited from chloride electro-winning solutions
AU - Sato, Yuki
AU - Oue, Satoshi
AU - Heguri, Shinichi
AU - Nakano, Hiroaki
PY - 2016/1/1
Y1 - 2016/1/1
N2 - To investigate the effect of impurities in solution on the lightness, surface morphology and current efficiency of deposited Ni, Ni electrodeposition was performed at a current density of 300 A/m 2 and 7.2×10 5 C·m -2 of charge, in an unagitated chloride solution containing Mn 2+ , Cr 3+ and SO 4 2- ions as impurity with pH 1 to 3, at 333 K. In solution containing 10 g·dm -3 of Mn 2+ , the current efficiency for Ni deposition decreased slightly, and crystal size of deposited Ni became small. The lightness of deposited Ni decreased when the concentration of Mn 2+ exceeded 1 g·dm -3 . When the Ni deposition was performed using soluble Ni anode to prevent the formation of MnO 2 at anode, the lightness of Ni was higher than that using insoluble anode, which suggesting that MnO 2 resulting from insoluble anode caused the decrease in lightness of Ni. In solution containing Cr 3+ , the current efficiency of Ni gradually decreased with increasing concentration of Cr 3+ , and significantly decreased above the Cr 3+ concentration of 0.1 g·dm -3 . The lightness of deposited Ni greatly decreased with increasing concentration of Cr 3+ above 0.001 g·dm -3 . In solution containing Cr 3+ , it is presumed that Cr(OH) 3 formed at cathode layer suppresses the Ni deposition, resulting in some codeposition of NiO and Ni(OH) 2 with Ni, which causes the decrease in current efficiency and lightness of Ni. On the other hand, in solution containing SO 4 2- , the current efficiency of Ni somewhat decreased at SO 4 2- concentration above 50 g·dm -3 , and significantly decreased above 100 g·dm -3 . The lightness of deposited Ni somewhat increased at SO 4 2- concentration of 20 g·dm -3 , and greatly increased above 20 g·dm -3 . Since the overpotential for Ni deposition increases with increasing concentration of SO 4 2- , the surface of deposited Ni becomes smooth, resulting in increase in lightness.
AB - To investigate the effect of impurities in solution on the lightness, surface morphology and current efficiency of deposited Ni, Ni electrodeposition was performed at a current density of 300 A/m 2 and 7.2×10 5 C·m -2 of charge, in an unagitated chloride solution containing Mn 2+ , Cr 3+ and SO 4 2- ions as impurity with pH 1 to 3, at 333 K. In solution containing 10 g·dm -3 of Mn 2+ , the current efficiency for Ni deposition decreased slightly, and crystal size of deposited Ni became small. The lightness of deposited Ni decreased when the concentration of Mn 2+ exceeded 1 g·dm -3 . When the Ni deposition was performed using soluble Ni anode to prevent the formation of MnO 2 at anode, the lightness of Ni was higher than that using insoluble anode, which suggesting that MnO 2 resulting from insoluble anode caused the decrease in lightness of Ni. In solution containing Cr 3+ , the current efficiency of Ni gradually decreased with increasing concentration of Cr 3+ , and significantly decreased above the Cr 3+ concentration of 0.1 g·dm -3 . The lightness of deposited Ni greatly decreased with increasing concentration of Cr 3+ above 0.001 g·dm -3 . In solution containing Cr 3+ , it is presumed that Cr(OH) 3 formed at cathode layer suppresses the Ni deposition, resulting in some codeposition of NiO and Ni(OH) 2 with Ni, which causes the decrease in current efficiency and lightness of Ni. On the other hand, in solution containing SO 4 2- , the current efficiency of Ni somewhat decreased at SO 4 2- concentration above 50 g·dm -3 , and significantly decreased above 100 g·dm -3 . The lightness of deposited Ni somewhat increased at SO 4 2- concentration of 20 g·dm -3 , and greatly increased above 20 g·dm -3 . Since the overpotential for Ni deposition increases with increasing concentration of SO 4 2- , the surface of deposited Ni becomes smooth, resulting in increase in lightness.
UR - http://www.scopus.com/inward/record.url?scp=84979894009&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84979894009&partnerID=8YFLogxK
U2 - 10.2320/jinstmet.J2016030
DO - 10.2320/jinstmet.J2016030
M3 - Article
AN - SCOPUS:84979894009
VL - 80
SP - 539
EP - 545
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 8
ER -