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
Date Written: May 16, 2018
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: Suggested Citation