Effect of electrolysis condition on the lightness and surface morphology of Ni deposited from chloride electro-winning solutions

Ryo Takahashi, Yuki Sato, Satoshi Oue, Shinichi Heguri, Hiroaki Nakano

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4 Citations (Scopus)

Abstract

To investigate the effect of current density and pH in solution on the lightness and surface morphology of deposited Ni, Ni electrodeposition was performed at current density 100 to 500 A·m-2 and the amount of charge 7.2 × 105 C·m-2 in unagitated chloride solution of pH 1 to 3 at 333 K. The composition and structure of the surface of the deposits were analyzed by radio frequency glow discharge optical emission spectroscopy and three dimensional SEM. The lightness of deposited Ni decreased with increasing pH, and became to be minimum at 300 A·m-2. The concentration of the surface oxide of deposits increased with pH, and became high at 300 A·m-2, which shows that the surface oxide of the deposits causes the decrease in the lightness. On the other hand, the surface of the deposited Ni was composed of both the pyramid microcrystals of several micrometers and the hill formed by the aggregations of pyramid microcrystals. To separate the two structural units of the pyramid microcrystals and the hill, the deposits were cut every 200 nm from the top to the thickness direction in three dimensional SEM, and the number and area of deposits in the cutting plane were measured, as a result, it was found that the lightness of the deposited Ni depended on the surface structure. The lightness of deposited Ni seems to depend on both the surface oxide and the microstructure of deposits.

Original languageEnglish
Pages (from-to)427-433
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume78
Issue number12
DOIs
Publication statusPublished - Dec 1 2014

Fingerprint

electrolysis
Electrolysis
Surface morphology
Chlorides
Deposits
chlorides
deposits
Microcrystals
microcrystals
Oxides
pyramids
Current density
oxides
Optical emission spectroscopy
Scanning electron microscopy
current density
Glow discharges
scanning electron microscopy
Electrodeposition
Surface structure

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Effect of electrolysis condition on the lightness and surface morphology of Ni deposited from chloride electro-winning solutions",
abstract = "To investigate the effect of current density and pH in solution on the lightness and surface morphology of deposited Ni, Ni electrodeposition was performed at current density 100 to 500 A·m-2 and the amount of charge 7.2 × 105 C·m-2 in unagitated chloride solution of pH 1 to 3 at 333 K. The composition and structure of the surface of the deposits were analyzed by radio frequency glow discharge optical emission spectroscopy and three dimensional SEM. The lightness of deposited Ni decreased with increasing pH, and became to be minimum at 300 A·m-2. The concentration of the surface oxide of deposits increased with pH, and became high at 300 A·m-2, which shows that the surface oxide of the deposits causes the decrease in the lightness. On the other hand, the surface of the deposited Ni was composed of both the pyramid microcrystals of several micrometers and the hill formed by the aggregations of pyramid microcrystals. To separate the two structural units of the pyramid microcrystals and the hill, the deposits were cut every 200 nm from the top to the thickness direction in three dimensional SEM, and the number and area of deposits in the cutting plane were measured, as a result, it was found that the lightness of the deposited Ni depended on the surface structure. The lightness of deposited Ni seems to depend on both the surface oxide and the microstructure of deposits.",
author = "Ryo Takahashi and Yuki Sato and Satoshi Oue and Shinichi Heguri and Hiroaki Nakano",
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T1 - Effect of electrolysis condition on the lightness and surface morphology of Ni deposited from chloride electro-winning solutions

AU - Takahashi, Ryo

AU - Sato, Yuki

AU - Oue, Satoshi

AU - Heguri, Shinichi

AU - Nakano, Hiroaki

PY - 2014/12/1

Y1 - 2014/12/1

N2 - To investigate the effect of current density and pH in solution on the lightness and surface morphology of deposited Ni, Ni electrodeposition was performed at current density 100 to 500 A·m-2 and the amount of charge 7.2 × 105 C·m-2 in unagitated chloride solution of pH 1 to 3 at 333 K. The composition and structure of the surface of the deposits were analyzed by radio frequency glow discharge optical emission spectroscopy and three dimensional SEM. The lightness of deposited Ni decreased with increasing pH, and became to be minimum at 300 A·m-2. The concentration of the surface oxide of deposits increased with pH, and became high at 300 A·m-2, which shows that the surface oxide of the deposits causes the decrease in the lightness. On the other hand, the surface of the deposited Ni was composed of both the pyramid microcrystals of several micrometers and the hill formed by the aggregations of pyramid microcrystals. To separate the two structural units of the pyramid microcrystals and the hill, the deposits were cut every 200 nm from the top to the thickness direction in three dimensional SEM, and the number and area of deposits in the cutting plane were measured, as a result, it was found that the lightness of the deposited Ni depended on the surface structure. The lightness of deposited Ni seems to depend on both the surface oxide and the microstructure of deposits.

AB - To investigate the effect of current density and pH in solution on the lightness and surface morphology of deposited Ni, Ni electrodeposition was performed at current density 100 to 500 A·m-2 and the amount of charge 7.2 × 105 C·m-2 in unagitated chloride solution of pH 1 to 3 at 333 K. The composition and structure of the surface of the deposits were analyzed by radio frequency glow discharge optical emission spectroscopy and three dimensional SEM. The lightness of deposited Ni decreased with increasing pH, and became to be minimum at 300 A·m-2. The concentration of the surface oxide of deposits increased with pH, and became high at 300 A·m-2, which shows that the surface oxide of the deposits causes the decrease in the lightness. On the other hand, the surface of the deposited Ni was composed of both the pyramid microcrystals of several micrometers and the hill formed by the aggregations of pyramid microcrystals. To separate the two structural units of the pyramid microcrystals and the hill, the deposits were cut every 200 nm from the top to the thickness direction in three dimensional SEM, and the number and area of deposits in the cutting plane were measured, as a result, it was found that the lightness of the deposited Ni depended on the surface structure. The lightness of deposited Ni seems to depend on both the surface oxide and the microstructure of deposits.

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