Abstract
The novel indolizine derivative inhibitor for acidizing shows an effective corrosion inhibition without the synergism of propargyl alcohol. The inhibitive indolizine derivatives were generated from BQC (Benzyl Quinolinium Chloride, a commonly used key compound in acidizing inhibitor) via a moderate 1,3-dipolar cycloaddition mechanism. High Resolution Mass Spectrometry (HRMS) and NMR were used to confirm the detailed chemical structure. The inhibition of two indolizine derivatives in 15 wt.% HCl for N80 steel were studied by weight loss measurement and electrochemical analysis. Without the synergism of propargyl alcohol, the inhibition efficiency of N80 in 15 wt.% HCl at 90°C merely reaches 80.3% even when 1.0 wt.% of BQC was added. However, under the same conditions, when the dosage of two indolizine derivatives is only 0.1 wt.%, the inhibition efficiency significantly grows up to over 99.0 %. The indolizine derivative could display an excellent protection performance at a much lower concentration. Compared with BQC, the active adsorption sites in indolizine derivatives are enhanced and consequently the inhibition is increased. The indolizine derivatives exhibit an enlightening economic advantage and provide an eco-friendly inhibitive material. They might be applied as an important component of new acidizing inhibitor.
