E. O. Fehintola, E.F. Olasehinde, L. Lajide and D. T. Oloruntoba 3
Keywords: Inhibition efficiency, weight loss measurement, Corrosion, Plant extracts, Mild steel, Statistical analysis
As a follow up on our previous studies, Cola nitida husks were collected at Litaye Village near Adeyemi College of Education, Ondo. Cleaned husks were subjected to sun-dry and air-dry processes. Sun-dried and air-dried husks were powdered, sieved and stored in desiccators at room temperature. A known mass of the powdered husks was soaked in ethanol in different containers for 72 hours to obtain inhibitor extract.. Extract was used as inhibitor for mild steel of known composition. Weight loss, inhibition efficiency (IE) and corrosion rate were studied using standard methods. Models that relate concentration of inhibitor and temperature to IE were proposed, established and evaluated using statistical methods. The inhibition efficiency increases with increasing extracts concentration to 91.333 % and 89.27 % at 333K of 1.0 g/l of extracts for the air and sun-dried extracts, respectively. CD, MSC, AIC and SC were in the range of 0.8815 to 0.9658, 1.8 to 3.1, 84.7 to 109.7 and 81.8 to 109.7 for both air and sun dried extracts respectively. The study revealed that the best models for sun and air dried extracts were linear with interaction with MSC (3.1 for both), AIC (81.7 for both ) and SC (84.7 for both), respectively. The worst models for sun and air dried extracts were log-linear without interactions and non- linear without interaction with MSC (1.8 for both) , AIC (109.7 for both) , SC (106.7 for both), respectively. The cost analysis revealed that it is economical to utilise plant husks extract. It was concluded that these two extracts of the present study can serve as effective green corrosion inhibitors for mild steel in acidic media and further investigations to assess the corrosion morphology and to isolate and confirm the active phytochemicals responsible for the inhibition of mild steel corrosion in acidic media are required.
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