Materials Transactions Online

Materials Transactions, Vol.53 No.04 (2012) pp.770-772
© 2012 The Japan Institute of Metals

Structure of Deposits Obtained from Urea-Based Melt Bath Containing Co and La

Shingo Arakawa1, Satoshi Oue2, Hiroaki Nakano2 and Shigeo Kobayashi3

1Department of Materials Process Engineering, Kyushu University, Fukuoka 819-0395, Japan
2Department of Materials Science & Engineering, Kyushu University, Fukuoka 819-0395, Japan
3Faculty of Engineering, Kyushu Sangyo University, Fukuoka 813-8503, Japan

Electrodeposition was performed in an unagitated solution from a urea-based melt bath containing Co and La under galvanostatic (10-40 mA·cm−2) and coulostatic (10 C·cm−2) conditions at 403 K, and the structure of the deposits was investigated. Co deposited in a metallic state at 10 mA·cm−2, whereas it was incorporated into deposits mainly as an oxide at high current densities of 30 and 40 mA·cm−2. La codeposited with Co as an oxide irrespective of current density. The content of La2O3 increased with current density. The deposits showed a granular crystal structure and became nonuniform crystals comprising large localized granules at high current densities.

(Received 2011/12/12; Accepted 2012/01/23; Published 2012/03/25)

Keywords: urea, cobalt, lanthanum, electrodeposition, structure

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