Study on Synthesis and Properties of Double Condensed Schiff Base Corrosion Inhibitor for Temperature - Resistant Acidification

Abstract

In order to solve the problem of acid corrosion in crude oil extraction, two double condensed Schiff base corrosion inhibitors XFJ - 1 and XFJ - 2 were synthesized by the solvent method. The corrosion inhibition performance at the environment of 90 ℃ and 15%(mass fraction) HCl was evaluated by static weightless method and polarization curve method, and the corrosion inhibition mechanism of XFJ - 1 and XFJ - 2 was explained by simulation method from the molecular level. Results showed that when the mass fraction of the two inhibition was 1.0%, respectively, the corrosion inhibition efficiency of the two corrosion inhibitors reached 82.90% and 99.46%, respectively, and simultaneously suppressed the cathodic and anodic reactions of N80 steel. The adsorption forms were consistent with the Langmuir adsorption isotherm model. The simulation results indicated that the corrosion inhibitor molecules would mainly accept or provide electrons through the benzene ring and the C=N double bond. The reactivity and adsorption energy of the XFJ - 2 corrosion inhibitor were greater than those of XFJ - 1, which was also consistent with the experimental data, indicating that the corrosion inhibition effect of XJF - 2 was better than that of XJF - 1.

Keywords

• schiff base corrosion inhibitor|weight loss method|polarization curve|ac impedance|simulation method