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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.53  No.4 (2012)  >  pp.770-772

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

Shingo Arakawa1), Satoshi Oue2), Hiroaki Nakano2) and Shigeo Kobayashi3)
1) Department of Materials Process Engineering, Kyushu University
2) Department of Materials Science & Engineering, Kyushu University
3) Faculty of Engineering, Kyushu Sangyo University

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.

urea, cobalt, lanthanum, electrodeposition, structure

Received: December 12, 2011
Accepted: January 23, 2012 , Published online: March 25, 2012
Copyright (c) 2012 The Japan Institute of Metals



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