Adsorption Kinetics of Picralima Nitida Seed Extract as a Green Corrosion Inhibitor for Zinc in 0.5 M H2SO4

Equatorial Journal of Chemical Sciences: Volume 2; Issue 1: 2018

13 Pages Posted: 29 May 2018

See all articles by Dr Joseph Ezeugo

Dr Joseph Ezeugo

Chukwuemeka Odumegwu Ojukwu University

O.D. Onukwuli

Nnamdi Azikiwe University

M. Omotioma

Enugu State University of Science and Technology

Date Written: May 16, 2018

Abstract

The potential properties of the ethanol extract of Picralima nitida seed, towards sulphuric acid corrosion of zinc is tested using weight loss methods. It was found that the extract acted as a good corrosion inhibitor for zinc corrosion in 0.5 M H2SO4 solution. The protective ability of the extract was discussed in view of Langmuir adsorption isotherm. It was revealed that the adsorption of the extract on zinc surface is governed by spontaneous process. The inhibition efficiency (IE) increases in line with corresponding increase in extract concentration. The temperature effect of the corrosion inhibition on the zinc was studied. Revealation from the studies indicated that the presence of extract increases the activation energy of the corrosion reaction. Furthermore, from the calculated thermodynamic parameters, it was observed that Picralima nitida extract provides a good protection to zinc against pitting corrosion in sulphate ion containing solutions.

Keywords: Zinc, corrosion, inhibition, Picralima nitida seed, inhibitor

Suggested Citation

Ezeugo, Dr Joseph and Onukwuli, O.D. and Omotioma, M., Adsorption Kinetics of Picralima Nitida Seed Extract as a Green Corrosion Inhibitor for Zinc in 0.5 M H2SO4 (May 16, 2018). Equatorial Journal of Chemical Sciences: Volume 2; Issue 1: 2018. Available at SSRN: https://ssrn.com/abstract=3179751

Dr Joseph Ezeugo (Contact Author)

Chukwuemeka Odumegwu Ojukwu University ( email )

P.M.B. 02
Uli
Nigeria

O.D. Onukwuli

Nnamdi Azikiwe University

Enugu-Onitsha Expressway
PMB 5025
Awka, DE Anambra State 234
Nigeria

M. Omotioma

Enugu State University of Science and Technology

Enugu
Enugu
Nigeria

Register to save articles to
your library

Register

Paper statistics

Downloads
17
Abstract Views
138
PlumX Metrics