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| ELECTRODEPOSITION OF Zn ON AZ91D IN CHOLINE CHLORIDE-2UREA IONIC LIQUID |
| YANG Haiyan1;2; GUO Xingwu1;2; WU Guohua1;2; DING Wenjiang1;2 |
1. National Engineering Research Center of Light Alloy Net Forming; Shanghai Jiaotong University; Shanghai 200240
2. State Key Laboratory of Metal Matrix Composites; Shanghai Jiaotong University; Shanghai 200240 |
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Abstract In aqueous electrolytes, electrodeposition on Mg alloys is still a challenge because Mg has high chemical reactivity. The process becomes more complicated in aqueous electrolytes owing to the hydrogen evolution. Ionic liquids as non-aqueous electrolytes in electrodeposition have received much attention from researchers. In present study, choline chloride-urea ionic liquid, which is sustainable, biodegradable and stable in air and water, was used as the solvent and the electrodeposition of Zn on AZ91D magnesium alloy was investigated. The pretreatment mechanism of the AZ91D substrate and the effect of current mode on the Zn coatings were studied by scanning electron microscope (SEM/EDX). The corrosion resistance of the deposited Zn coatings were studied by electrochemical testing. The results show, Zn coatings could be electrodeposited on pretreated AZ91D substrate from choline chloride-urea ionic liquid. Application of pulse deposition was superior to galvanostatic deposition in producing dense, uniform and cohesive Zn coating. By pulse deposition Zn coatings, the OCP of AZ91D substrate moves in positive direction from -1610 mV to -1072 mV and the corrosion current density Icorr decreases from 14.9 μA/cm2 to 6.9 μA/cm2，comparable to those of pure Zn (OCP=-1078 mV， Icorr=6.6 μA/cm2).
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Received: 27 October 2009
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Corresponding Authors:
GUO Xingwu
E-mail: xingwuguo@sjtu.edu.cn
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