Prediction of Corrosion Inhibition Efficiency of Acalypha godseffiana leaves Extracts
Keywords:
Inhibition efficiency, weight loss measurement, Corrosion, Plant extracts, Mild steel, Statistical analysis.Abstract
As a follow up on our previous studies (Mathematical Modelling of Corrosion Inhibition Efficiency of Acalypha Wilkesiana Leaves) Acalypha godseffiana leaves were collected at Adeyemi College of Education, Ondo. Cleaned leaves were subjected to sun-dry and air-dry processes. Sun-dried and air-dried leaves were powdered, sieved and stored in desiccators at room temperature. A known mass of the powdered leaves was soaked in ethanol in different containers for 72 hours to obtain inhibitor extracts. Extracts were 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, temperature to IE were proposed, established and evaluated using statistical methods. . The inhibition efficiency increases with increasing extracts concentration to 88.43 % and 88.37 % 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 0.8794 to 0.9790, 2.1 to 4.1, 67.3 to 104.8 and 73.1 to 101.8 for both air and sun dried extracts.
The table revealed that the best models for sun and air dried extracts were linear with interaction with MSC (3.6 and 4.1), AIC (73.1 and 64.3) and SC (76.1 and 67.3), respectively. The worst models for sun and air dried extracts were log-linear without interactions and non- linear without interaction with MSC (2.1 and 2.9) , AIC (101.8 and 86.6) , SC (104.8 and 89.6), respectively. The cost analysis revealed that it is economical to utilise plant leaves 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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