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이재하,김영근,이이근 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.4
Industrial application of Zn-Mn alloy electroplated film with inherently superior natures in brightness and corrosion resistance is limited due to its low current efficiency. It is reported, however, that additives such as selenious acid, sodium thiosulfate and thiourea enhance the current efficiency in Zn-Man aVoy electroplating. The effects of those additives on electrodeposition behavior of Zn-Mn alloy were studied by analysing polarization curves of Zn-Mn, Zn and Mn deposition in sulfate baths containing sodium citrate, and electrodeposited surface were scanned by x-ray diffractometer and SEM. Electrodeposition of Zn-Mn alloy in sulfate baths containing sodium citrate showed normal behavior of codeposition and low current efficiency. On the other hand, it was seen than partial polarization curves of Zn were smooth and current density of Mn at high cathodic potential increased in sulfate baths containing the additives described above. The additives were found to improve the current efficiency, and the effect of selenious acid and sodium selenite was especially remarkable. XRD and SEM analyses on Zn-Mn alloy electrodeposition showed that these additives played an important role in changing the alloy phase from epsilon to gamma, and decreasing the grain size of deposit.