Effects of electrodeposition parameters on corrosion resistance of ZnSn coatings on carbon steel obtained from eutectic mixture based on choline chloride and ethylene glycol

Abstract

Zn and ZnSn coatings were electrodeposited on carbon steel surfaces from choline chloride and ethylene glycol solvent (1ChCl:2EG). The corrosion resistance of the coatings was investigated in a 3.5% NaCl solution, and the results revealed that Zn deposition was favored by increasing bath temperature and electrodeposition potential. Besides, Zn-enriched coatings were also obtained from Sn-rich Zn/Sn baths, and the coating morphologies were affected by these parameters. Finally, the ZnSn layer (14% Sn) electrodeposited at −1.3 V and 363 K increased the corrosion resistance up to 6 times towards the pure Zn layer under the same conditions.