Friday Onyekwere Nwosu
@unilorin.edu.ng
Professor, Faculty of Physical Sciences
Professor, Faculty of Physical Sciences
University of Ilorin
RESEARCH, TEACHING, or OTHER INTERESTS
Chemistry, Analytical Chemistry
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
F O Nwosu and S O Amusat
Portuguese Society of Electrochemistry
Metallic materials remain an indispensable element in industries. The present study is aimed at the assessment of Parinari polyandra leaves inhibition properties on mild steel in a 1 M HCl solution. This was investigated using gravimetric and electrochemical methods. Physicochemical and spectroscopic analyses of the leaves extract were done using standard methods. A yield of 19.82% was obtained, while the leaves extract FTIR spectra showed bands of 3404 cm -1 and 2926 cm -1 , which indicated the presence of a strong band of phenolic O-H and C-H stretch functional groups, respectively. A maximum corrosion inhibition efficiency of 97.22% was obtained. Langmuir adsorption isotherm fitted the inhibitor data well. From electrochemical methods, the corrosion rate value of 17.626 mmpy obtained for the uninhibited mild steel was higher than 0.02044 – 2.2267 mmpy range values recorded for the mild steel surface covered with P. polyandra leaves extract in an acidic medium. SEM images showed the leaves extract inhibition effect against mild steel corrosion in a 1 M HCl solution. Electrochemical analysis using the Tafel plot also showed the leaves extract corrosion inhibition capacity, suggesting a mixed type inhibitor. Thus, P. polyandra leaves extract might act as a green corrosion inhibitor for mild steel utilized in industrial applications.
Friday O. Nwosu, Oluwaseyi D. Saliu, Khadijat A. Oyinlola, and Ebunoluwa O. Ojo
Springer Science and Business Media LLC
F. O. Nwosu and O. D. Olayinka
Springer Science and Business Media LLC
Friday Onyekwere Nwosu, Oluwaseun Jacob Ajala, Fatai Olaiwola Okeola, Samad Alaya Adebayo, Oluyemi K. Olanlokun, and Abiodun Omodele Eletta
Elsevier BV
M M Muzakir, F O Nwosu, and S O Amusat
Portuguese Society of Electrochemistry
The inhibitive action of Chromolaena odorata stems extract, in various concentrations, against mild steel corrosion in a 1 M NaCl solution , was studied using weight loss, potentiodynamic polarization methods and scanning e lectron microscopy. Maximum inhibition efficiency of 99.83 % was obtained, at 3 03 K, for an extract concentration of 3000 mgL. The activation and free energies for the inhibiti on reactions supported the physical adsorption mechanism. The extract adsorpti on onto the mild steel surface was found to be exothermic, spontaneous, and to obey th e Langmuir adsorption model. FTIR analysis showed the presence of hydroxyl (OH) an d carbonyl(C=O) functional groups and aromatic rings in lignin, which are the binding groups that might be responsible for lignin’s inhibitive action against mild steel corrosion. Furthermore, SEM analysis revealed that the mild steel surface was a ffected by lignin’s adsorption, due to the formation of a protective film.
Friday Onyekwere Nwosu, Oluwaseun Jacob Ajala, Rukayat Motunrayo Owoyemi, and Bukola Ganiyat Raheem
Springer Science and Business Media LLC
Oluwaseun Jacob Ajala, Friday Onyekwere Nwosu, and Rasheed Kayode Ahmed
Springer Science and Business Media LLC
Friday Onyekwere Nwosu, Bamidele Iromidayo Olu-Owolabi, and Kayode Oyebode Adebowale
PCSIR-Scientific Information Center