Anticorrosion performance of chrysophyllum albidum and a synthetic inhibitor in simulated drilling fluid
Date
2019-09
Authors
Journal Title
Journal ISSN
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Publisher
Federal University of Technology, Owerri
Abstract
The anti-corrosive performance of ethanol extracts of Chrysophyllum albidum and a synthetic inhibitor was investigated using weight loss and potentiodynamic polarization technique on mild steel. Results from weight loss analysis revealed that inhibition efficiency increased with increase in concentration of the inhibitors while corrosion rate decreased with increase in concentration of the inhibitors due to the adsorption of the organic molecules on the metal surface. Highest inhibition efficiency of 96.6% at 218.2 ml/L was recorded after five days for the ethanol extracts of Chrysophyllum albidum and 96.05% at 250ml/L after three days for the synthetic inhibitor both in a simulated drilling fluid. Temperature studies carried out also revealed the efficacy of the ethanol extracts of Chrysophyllum albidumas compared to the synthetic inhibitor at the temperature ranges of 313K and 333 K. From the values of activation energy obtained, the mechanism of the adsorption process was proposed to be predominantly of chemisorption for both inhibitors. The values ofΔG obtained were all negative which reveals spontaneity of the process while ΔHads reveals endothermic reactions for both inhibitors in the simulated drilling fluid medium. Potentiodynamic polarization results showed that both the anodic and cathodic reactions were inhibited indicating that the inhibitors are of mixed type. The experimental data obtained fits well with Langmuir adsorption isotherm indicating that the inhibitors were adsorbed uniformly on the metal surface.
Description
This thesis is for the award of Master of Science (MSc.) in Physical Chemistry
Keywords
Chrysophyllum albidum, corrosion inhibition, weight loss, mild steel, synthetic inhibitor, Department of Chemistry
Citation
Achinihu, I. O. (2019). Anticorrosion performance of chrysophyllum albidum and a synthetic inhibitor in simulated drilling fluid [Unpublished Master's Thesis]. Federal University of Technology, Owerri, Nigeria