Inhibition Performance of FFFD-27SH Inhibitor for Carbon Steel in 3.5% NaCl Solution

The inhibitive action of FFFD-27SH inhibitor toward carbon steel corrosion in 3.5%NaCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy(EIS). The results indicate that the addition of FFFD-27SH, which acts as an anodic type inhibitor, can effectively decrease the corrosion current densities of the carbon steel and increase the corrosion potential. EIS measurement results indicate that both of the charge transfer resistance and impedance increase greatly with the addition of FFFD-27SH and the double electric layer capacitance decreases significantly. The inhibition efficiency increases with the increase in inhibitor concentration, but changes little when its concentration is over 3%.