Study for the Stability and Corrosion Inhibition of Electrophoretic Deposited Chitosan on Mild Steel Alloy in Acidic Medium

Electrophoretic deposition (EPD) of chitosan (CS) on mild steel substrates was done from a chitosanacetic acid solution. To increase the protective ability of chitosan coating, the coated samples were immersed in glutaraldehyde solution for 5 minutes. The electrophoretic deposition (EPD) of chitosan on mild steel substrates was investigated by FTIR, scanning electron microscopy, potentiodynamic polarization measurements, and electrochemical impedance spectroscopy (EIS). The results of EIS showed that the resistance (Rt) or film stability increases with increasing immersion time in 0.5 M H2SO4 solution indicating a decrease in corrosion rate of the tested alloy with time. EIS measurements under open-circuit conditions confirmed well polarization results. CS showed very good inhibition efficiency (IE) in 0.5 M sulphuric acid solution reaches to 98.1%. The method enabled the formation of adherent, protective and uniform coatings.