Corrosion inhibition of C38 steel in 1M hydrochloric acid medium by alkaloids extract from Oxandra asbeckii plant

• Published in: Corrosion science Vol. 53; no. 2; pp. 687 - 695
• Main Authors: Lebrini, M., Robert, F., Lecante, A., Roos, C.
• Format: Journal Article
• Language: English
• Published: 01-02-2011
• Subjects: Corrosion; Corrosion inhibitors; Electrochemical impedance spectroscopy; Extraction plants; Inhibition; Iron and steel plants; Polarization; Steels
• ISSN: 0010-938X
• DOI: 10.1016/j.corsci.2010.10.006

The inhibition effect of alkaloids extract from Oxandra asbeckii plant (OAPE) on the corrosion of C38 steel in 1M hydrochloric acid solution has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The corrosion inhibition efficiency increases on increasing plant extracts concentration. Cathodic and anodic polarization curves show that OAPE is a mixed-type inhibitor. The effect of temperature on the corrosion behavior of C38 steel in 1M HCl with and without addition of plant extract was studied in the temperature range 25-55 degree C. The thermodynamic functions of dissolution and adsorption processes were calculated from experimental polarization data and the interpretation of the results are given. The adsorption of this plant extract on the C38 steel surface obeys the Langmuir adsorption isotherm. Surface analysis (Raman) was also carried out to establish the corrosion inhibitive property of this plant extract in HCl solution.