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Performance of Terminalia catappa on mild steel corrosion in HCl medium

Omotosho, Olugbenga Adeshola and Okeniyi, Joshua Olusegun and Loto, C. A. and Popoola, Abimbola Patricia Idowu and Obi, Chukwunonso Ezekiel and Sonoiki, Oluwatobi Oluwasegun Oluwagbenga and Oni, Adeoluwa Barnabas and Alabi, Ayomide Samuel and Olarewaju, Abisola Ebunoluwa (2016) Performance of Terminalia catappa on mild steel corrosion in HCl medium. AIP Conference Proceedings, 1758. 030027. ISSN 0094-243X

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This work investigates Terminalia catappa leaf-extract performance on mild steel corrosion in 0.5 M hydrochloric acid (HCl). Electrochemical linear-sweep-voltametry (LSV) and gravimetric techniques were employed for assessing the mild steel corrosion in the HCl test-environment of immersion having different concentrations of the leaf-extract. Results showed that all the concentrations of the Terminalia catappa leaf-extract employed inhibited mild steel corrosion from the electrochemical (potentiodynamic) and the gravimetric considerations. Also, corrosion rate from LSV exhibited excellent correlation (R = 95.77%, Nash-Sutcliffe Efficiency (NSE) = 91.72% and p-value = 0.02383) with linear function of the corrosion rate from gravimetric method, for the leaf-extract concentrations employed. From the experimental model, 6 g/L Terminalia catappa exhibited optimal inhibition efficiency, η = 78.07%, while 8 g/L Terminalia catappa was predicted as optimally effective, η = 75.41%, by the correlation fitting model, at inhibiting mild steel corrosion in the medium. However, adsorption isotherm modelling showed that the experimental gravimetric, experimental potentiodynamic and predicted potentiodynamic data exhibited agreements in following the Langmuir adsorption isotherm. All the three data models indicated favourable adsorption and identified physisorption as the prevalent adsorption mechanism of Terminalia catappa leaf-extract on mild steel immersed in the 0.5 M HCl medium.

Item Type: Article
Subjects: Q Science > QA Mathematics
Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TH Building construction
T Technology > TJ Mechanical engineering and machinery
Depositing User: Dr Joshua Olusegun Okeniyi
Date Deposited: 12 Aug 2016 09:52
Last Modified: 31 Oct 2018 11:03

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