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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.58  No.11 (2017)  >  pp.1538-1545

MATERIALS TRANSACTIONS
<<Previous article Vol.58  No.11 (2017)   pp.1538 - 1545 Next article>>

Effects of Additives on the Surface Roughness and Throwing Power of Copper Deposited from Electrorefining Solutions

Atsuhiro Suzuki1), Satoshi Oue2), Shigeo Kobayashi3), Hiroaki Nakano2)
1) Department of Materials Process Engineering, Kyushu University 2) Department of Materials Science & Engineering, Kyushu University 3) Department of Applied Chemistry and Biochemistry, Kyushu Sangyo University

To elucidate the synergistic effects of gelatin, thiourea, and chloride ions on the surface roughness, throwing power, and polarization curves for Cu deposition from electrorefining solutions, Cu electrodeposition was performed at a current density of 200 A·m−2 and a charge of 5 × 105 C·m−2 in an unagitated sulfate solution containing 0.708 mol·dm−3 of CuSO4 and 2.04 mol·dm−3 of H2SO4 at a temperature of 60℃. In solutions containing all three additives (gelatin, thiourea, and chloride ions), the surface roughness of deposited Cu decreased with increasing thiourea and gelatin concentrations and decreasing chloride ions concentration. On the other hand, the throwing power of deposited Cu improved with decreasing thiourea concentration and increasing gelatin concentration in solutions containing all three additives. The throwing power of deposited Cu was significantly improved in solutions containing both gelatin and chloride ions. The polarization resistance dE/di for Cu deposition increased in solutions containing both gelatin and chloride ions, resulting in an improvement in the throwing power of Cu deposition. As small amounts of thiourea have a depolarization effect on Cu deposition, a smoothing effect is expected to result from the promotion of deposition at recesses.

 

This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 81 (2017) 358–365.




Keyword:
copper, electrorefining, electrolysis, gelatin, thiourea, chloride ions, throwing power, surface roughness, polarization curve, depolarization

Received: July 07, 2017
Accepted: September 01, 2017 , Published online: October 25, 2017

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