발간논문

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Vol.35, No.8, 1052 ~ 1058, 1997
Title
Characterization of Zn-Ni Alloy Deposits in Alkaline Bath
김성규 , 이화영 , 오종기 Sung Gyu Kim , Hwa Young Lee , Jong Kee Oh
Abstract
The objective of this study is to find out the optimum conditions and characteristic of zinc-nickel alloy electrodeposition in an alkaine bath. The results show that it is known from the polarization curve that nickel in the zinc-nickel bath is deposited at -1.0V. Also, increasing the nickel concentration in the bath increases the nickel content in the alloy deposit. Increase in current density from 0.2 to 0.5A/d㎡ decreases the nickel content in the alloy deposit, significantly. Electroplating of zinc-nickel alloy in an alkaine bath appears anomalous codeposition, zinc being the less noble metal deposit in preference to the more ncble nickel. Temperature within the range of 50℃ has no appreciable effect on the content of nickel in the alloy deposit. But the nickel content in the alloy deposit increase dramatically in the range of more than 60℃. Generally, the nickel content of alloy deposit obtained from an alkaline bath maintains below 10 wt% under the following optimum conditions; Zn conc. 10g/l·Ni conc. 0.8-1g/l·Triethanolamine 40g/l·Room temperature Current density 6-10A/dm₂.
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