Structure, composition and corrosion resistance studies of Co-Cr alloy electrodeposited from deep eutectic solvent (DES)

摘要

Electrodeposition of Co-Cr alloys on brass and mild steel substrates has been investigated using direct current (DCD) and pulsed electrodeposition (PED) techniques. The alloy contains approximately 65-81% Co, and 19-35% Cr. The aim of this work is to develop a stable deep eutectic solvent (DES) containing Co(II), and Cr(III) ion without any Cr complexing agent. The influences of direct current and pulsed current on the Co-Cr compositions have been investigated. The crystallographic structures, morphology and chemical composition of Co-Cr deposited films are analyzed by means of XRD, SEM, EDS and XPS. The anticorrosive properties of Co_(80.04)Cr_(19.95) (DCD) and Co_(65.44)Cr_(34.55) (PED) alloy on mild steel substrate have been studied and compared using potentiodynamic polarization and electrochemical impedance spectroscopy.