抄録
The effect of additives such as selenious acid, sodium thiosulfate and thiourea on the electrodeposition behavior of Zn-Mn alloys from sulfate baths containing sodium citrate was investigated. The additives were found to improve the current efficiency, especially in the deposition of alloys. of high Mn content, but showed little effect on the Mn content of the alloys.
Polarization curve for Zn-Mn alloys electrodeposition revealed that the additives affected hydrogen evolution in addition to Zn and Mn deposition, i.e., the partial current for hydrogen evolution was suppressed to modify current efficiency at potentials less noble than -1.5V (vs. Ag/AgCl).
X-ray diffraction patterns for the Zn-Mn alloys also showed that these additives readily changed the alloy phase from epsilon to gamma.
