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http://dx.doi.org/10.15207/JKCS.2017.8.11.287

Effect of Electrolytic Condition on Composition of Zn-Co Alloy Plating  

Kang, Soo Young (Dept. of Metallurgical & Material Engineering, lnha Technical College)
Publication Information
Journal of the Korea Convergence Society / v.8, no.11, 2017 , pp. 287-292 More about this Journal
Abstract
The electrodeposition of Zn on the automotive parts has been adapted However, because Zn electrodeposit needs to increase thickness for corrosion protection, it has problem of destruction of electrodeposit Zn-based electrodeposit have teen studied for corrosion protection and decreasing electrodeposit thickness. Especially; Zn-Co electrodeposit have much attention In this study, the Composition of Zn-Co electrodeposit in various manufacturing condition such as temperature, current density and electrolyte content was investigated to understand effect of electrolysis condition on Co content of specimen. The results were explained by cathode overvoltage and diffusion coefficient. As the current density increases, the electrolyte temperature decreases, and as the electrolyte concentration decreases, the overvoltage of the cathode increases. As the overvoltage of the cathode increases, the concentration polarization becomes more important than the activation polarization. Concentration polarization is determined by the diffusion of the mass transfer in the diffusion layer. In a constant concentration polarization, a large amount of elements with a large diffusion coefficient is diffused. That is, as the overvoltage of the cathode increases, the Zn content having a large diffusion coefficient increases.
Keywords
Zn-Co; alloy deposition; corrosion resistance; electrodepostion conditions; anti-corrosion;
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