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Current Efficiency and Composit ion of Zn-Cr and Zn-Cr-X Ternary Alloy Electrodeposits  

Ye G.C. (College of Metallurgical Engineering and Material Science, Yeungnam Unvi.)
Kim D.Y. (College of Metallurgical Engineering and Material Science, Yeungnam Unvi.)
Ahn D.S. (Dongbu Steel. Technical Research Lab.)
Publication Information
Journal of the Korean institute of surface engineering / v.36, no.3, 2003 , pp. 256-262 More about this Journal
Abstract
The current efficiency and the composition of Zn-Cr and Zn-Cr-X (X : Co, Mn) alloy electrodeposits were investigated by using chloride bath with EDTA auditive and flow cell plating system. The current efficiency of Zn-Cr alloy decreased with increasing current density, while it increased with the content of Co and Mn of the Zn-Cr-X alloy bath in high current density region. The Cr content in Zn-Cr alloy increased from 1.4-2.7 to $28wt\%$ with increasing current density and the phase structure of the alloys changed from $\eta-Zn$ through $\eta-Zn+\gamma with Increasing Cr content of the alloys. The Co content in Zn-Cr-Co alloys increased with Co content of the bath, while Cr content of the alloy increased or decreased in low current density region $(10-75A/dm^2)$ or high current density region $(75-100A/dm^2)$, respectively. $\gamma-ZnCo$ phase was formed in the Zn-Cr-Co alloy with above $9.0wt\%$ Co. The content of Mn and Cr in Zn-Cr-Mn alloys increased or decreased with the increase of current density in high current density region, respectively while Cr content of the alloy decreased noticeably with the increase of Mn content in the bath. Two phases of $\delta_1-ZnMn$ and $\gamma were formed in the Zn-Cr-Mn alloy with above $8.6wt\%$ Mn.
Keywords
Zn-Cr; Zn-Cr-X; Electrodeposits; Current efficiency;
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