Abstract
Polypyrrole (PPy) doped with 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPSNa) coating was electrochemically deposited MMFX steel by chronopotentiometry technique. The effect of concentration of AMPSNa, the applied current density, and deposition time on corrosion protection efficiency were investigated. The corrosion protection ability of the PPy/AMPSNa coating was studied using polarization curves and electrochemical impedance spectroscopy (EIS) after the electrodes had been immersed in a 0.6 M NaCl solution. PPy films were characterized by infrared spectroscopy and scanning electron microscopy. The results showed that PPy /AMPSNa coating has a cauliflower-like nodular surface and a uniformly thin layer covering the surface. With electrochemically deposition condition 0.03 M AMPSNa, 2 mA/cm2 for 7.5 min. the PPy coatings tended to exhibit better corrosion protection ability.
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