鉄族金属共存下におけるZnのUnderpotential Deposition [in Japanese] Underpotential Deposition of Zn with Iron-group Metals [in Japanese]
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Zn underpotential deposition with iron-group metals was studied using a Cu substrate in sulfate or chloride baths containing a small amount of Zn<sup>2+</sup> ions at 5 to 80°C under potentiostatic conditions. Underpotential deposition occurs only in the presence of iron-group metals and is facilitated when conditions permit decreased inherent deposition overpotential of iron-group metals such as high temperature and Cl<sup>-</sup> additive. This is similar to induced alloy deposition, in which the properties of iron-group metals in a metallic state play an important role. This is cleary different, however, from induced because Zn deposition occurs at more noble potentials than its equilibrium. Iron-group metal properties in a metallic state appear responsible for Zn underpotential deposition, although the detailed mechanism is yet unclear. If the codepositing iron-group metal consistently reduces the activity coefficient of Zn deposited on the progressively formed cathode surface, the large amount of underpotential deposition is explainable thermodynamically.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 49(11), 1209-1214, 1998-11-01
The Surface Finishing Society of Japan