Corrosion Inhibition of X70 Steel by Butyl Quaternary Ammonium Halides Compounds in Sodium Chloride Solution

Abstract

This study investigates corrosion inhibition of X70 steel surfaces, by Butyl-QuaternaryAmmonium halides, in a 3% of NaCl solution with pH = 6. In the first part, the influence of
inhibitor concentration study reveals that the I-TBA is the best inhibitor (≈79% on the X70
steel). Each compounds exhibits Langmuirian behaviour and the values of ΔG° indicate that
we have a physical adsorption. In the second part, the influence of immersion time study
on the stability of the formed films reveals that they are stable and require about 150 min
to be established, and deliver efficiencies that overtake the 70% in all cases. The stationary
polarization curves and electrochemical impedance spectroscopy (EIS) diagrams show the
high inhibitory effect of iodide compared with other halides