Licorice root extract as corrosion inhibitor for tin in sodium chloride solutions

Abdallah, M.; El-Etre, A. Y.; Kamar, E. M.; Eid, Salah

doi:10.21608/jbes.2020.371471

Licorice root extract as corrosion inhibitor for tin in sodium chloride solutions

Document Type : Original Article

Authors

¹ Chemistry Department, Faculty of Science, Benha University, Benha, Egypt Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia

² Chemistry Department, Faculty of Science, Benha University, Benha, Egypt

³ Chemistry Department, Faculty of Science, Benha University, Benha, Egypt Chemistry Department, College of Science and Arts, AlGurayat, Jouf University, AlGurayat, KSA

10.21608/jbes.2020.371471

Abstract

The corrosion behavior of tin electrode in 0.6 M NaCl solution as well as the effect of addition aqueous extract of licorice
root were investigated using potentiodynamic techniques. It was found that the inhibition efficiency increases as the
concentration of extract is increased. The inhibitive action of the extract was interpreted in view of adsorption of the extract
components at the tin surface. The results showed that the adsorption follows Freundlich adsorption isotherm. The negative
value of free energy of adsorption suggests a spontaneous process. Moreover, the addition of licorice root extract increases
the resistance of tin toward pitting corrosion.

Keywords