Inhibition, Adsorption and Thermodynamic Investigation of Iron Corrosion by Green Inhibitors in Acidic Medium

The International Journal Of Science & Technoledge, Volume 5, Issue 4, 2017

9 Pages Posted: 17 Dec 2018

See all articles by B. U. Ugi

B. U. Ugi

Cross River University of Technology (CRUTECH) - Department of Chemical Sciences

Thomas Odey Magu

University of Calabar (UNICAL); Institute of Chemistry, Chinese Academy of Sciences, Beijing

Date Written: April , 2017

Abstract

The corrosion inhibition potentials of alkaloid, saponin and flavonoid extracts of Ocimunbasilicum leaves were investigated by evaluating the corrosion behaviour of Iron immersed in 1.0 M H2SO4 solutions containing varied concentration of the extract (0.5 g/L, 1.0 g/L, 2.0 g/L, 3.5 g/L, 5.0 g/L, 7.5 g/L and 10.0 g/L) using chemical methods. Maximum temperature attained, reaction time, thermodynamic data and adsorption characterizations were utilized to evaluate the corrosion inhibition and adsorption properties of the extract. The results revealed that, the corrosion of Iron decreases with increase in concentration of alkaloid extract, saponin extract and flavonoid extract, also, increases with increase in H2SO4 concentration. The increase in addition of the green inhibitors to the corrosive medium, improve the values of inhibition efficiency of the extract in the order AEOBL > SEOBL > FEOBL. In all cases, Flavonoid extracts exhibits least effect on the corrosion of Zinc in comparison with alkaloids and saponins. Results obtained from adsorption studies indicated that, all the green inhibitors were adsorbed on the surface of the Iron and that the adsorption fit excellently with the assumptions of the Langmuir adsorption isotherm model. All data acquired revealed that Ocimunbasilicum leaves are efficient inhibitors of corrosion in acid medium due to the presence of heterocompounds: saponins, tannins, flavonoids, glycosides, carbohydrates, reducing sugars, terpenoids, steroids and alkaloids.

Keywords: Weight Loss, Langmuir Isotherm, Gibbs Free Energy, Inhibition Efficiency, Ocimunbasilicum, Crude Extract

Suggested Citation

Ugi, B. U. and Magu, Thomas Odey, Inhibition, Adsorption and Thermodynamic Investigation of Iron Corrosion by Green Inhibitors in Acidic Medium (April , 2017). The International Journal Of Science & Technoledge, Volume 5, Issue 4, 2017. Available at SSRN: https://ssrn.com/abstract=3291137

B. U. Ugi

Cross River University of Technology (CRUTECH) - Department of Chemical Sciences

Nigeria

Thomas Odey Magu (Contact Author)

University of Calabar (UNICAL) ( email )

PMB 1115, Calabar
Calabar
Calabar, CA Cross River State 540402
Nigeria
+2347067024323 (Phone)

HOME PAGE: http://www.unical.edu.ng

Institute of Chemistry, Chinese Academy of Sciences, Beijing ( email )

No. 2 1st North Street Zhongguancum Beijing
Beijing, P.R of China
Bejing, Haidian 100190
China
+8619801310665 (Phone)

HOME PAGE: http://english.ic.cas.cn/au/

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