Al-Zn co-electrodeposition by a double counter electrode electrodeposition system from an AlCl3-1-ethyl-3-methylimidazolium chloride ionic liquid bath

作者：Sato Yusuke^*; Azumi Kazuhisa

来源：Surface and Coatings Technology, 2016, 286: 256-261.

DOI：10.1016/j.surfcoat.2015.10.080

• Co-electrodeposition system
• Ionic liquid
• Aluminum
• Zinc

A double counter electrode electrodeposition system was developed to enable co-electrodeposition of Al and Zn with a desired composition. This system switches the active counter electrodes of different metals as a metal ion source to alter the composition of an EMIC-AlCl3-based ionic liquid bath. Using an integrated counter electrode composed of Al and Zn plates and a thin electrolyte cell, Al and Zn were co-electrodeposited on a Cu plate substrate by the galvanostatic pulse method. The effects of electrodeposition current density, distance between the working and counter electrodes, and electric charge ratio of anodic dissolution on the Al and Zn counter electrodes on the composition of coatings were examined. Experimental results confirmed that current density and charge ratio affected the composition of the coatings. On the other hand, the distance between the counter and the working electrode showed a rather complicated effect on the coating composition. This was explained by the transition of the transport mechanism of Zn ions supplied from the Zn counter electrode to the working electrode surface via the ionic liquid bath depending on the distance.

• 出版日期2016-1-25