Buprofezin as a potent corrosion inhibitor for carbon steel in 1 M HCl solution

Abstract

Buprofezin was utilized to inhibit carbon steel (CS) corrosion in 1 M HCl, and corrosion behaviour was assessed using electrochemical (PDF, EIS) and chemical (ML) methods. Different techniques were used to identify the adsorbed film formed on the CS surface. Furthermore, the CS surface was examined using Fourier transform infrared spectroscopy (FTIR) to identify buprofezin bands. The experimental results indicate that buprofezin's efficiency increases with the inhibitor test solution concentration but decreases with increasing temperature. Using ML tests, buprofezin's inhibition efficiency (% IE) is 89.7% at 21 × 10⁻⁶ M, 25 °C and reached 81.3% at the same concentration and at 55 °C. According to the Langmuir adsorption isotherm, the buprofezin under investigation adsorbs on the CS surface. By computing a few pertinent thermodynamic parameters, the free energy of adsorption for the investigated buprofezin was established and discussed. Alongside the effectiveness of the inhibition, buprofezin's spontaneous adsorption on CS also increased. Polarization curves indicate that buprofezin is a mixed-type inhibitor that delays both cathodic hydrogen evolution and anodic CS dissolution. Theoretical studies confirmed the experimental results. The results show good agreement among all techniques.