ホウフッ化物浴からの亜鉛-マンガン合金電析挙動 [in Japanese] Electrodeposition Behavior of Zinc-Manganese Alloys from Fluoborate Baths [in Japanese]
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Zn-Mn alloy electrodeposition from fluoborate baths was conducted and the deposition behavior was compared to that from citrate baths. The results obtained were as follows<br>(1) Fluoborate baths markedly increased cathode current efficiency and the maximum current density applicable to this alloy system. The disadvantage of low productivity in citrate baths was thus largely eliminated in fluoborate baths.<br>(2) Alloys consisting of ε and γ phases were obtained in both fluoborate and citrate baths. The morphologies of the deposited alloys considerably differed.<br>(3) Codeposition of Mn with Zn occurred at more positive potentials in fluoborate than citrate baths. This enables the electrodeposition of a high Mn-content alloy with higher current efficiency in fluoborate baths.<br>(4) Fluoborate baths showed a large pH buffer capacity at pH 3.5 and insoluble MnF<sub>2</sub> formed at this pH. This indicates that Mn deposition proceeds by preceding MnF<sub>2</sub> formation.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 47(8), 714-719, 1996-08
The Surface Finishing Society of Japan