Kalanchoe blossfeldina extract as a green corrosion inhibitor for carbon steel in Na2S-polluted NaCl solutions

Abstract

The potential of Kalanchoe blossfeldina extract (KBE) as a corrosion inhibitor of carbon steel (CS) in polluted NaCl solution (3.5% NaCl + 16 ppm Na2S) was determined utilizing AC impedance (EIS), potentiodynamic polarization (PP) and mass loss (ML) methods. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), and atomic force microscope (AFM) analyses were used to examine the CS surface. The adsorption of this extract follows Temkin isotherm. Maximum protection was achieved 92.6% at 300 ppm concentration. PP studies discovered that KBE behaved as a mixed-kind inhibitor in polluted NaCl solution. The inhibition efficiency (IE) of KBE obtained from the ML and electrochemical tests were in excellent agreement.