Browsing by Author "Yahya, R. A."
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Item CORROSION INHIBITION OF AISI 1007 STEEL IN HYDROCHLORIC ACID USING CUCUMIS SATIVUS (CUCUMBER) EXTRACTS AS GREEN INHIBITOR(Faculty of Engineering Hunedoara, University of Politehnica, Timisoara, 2018-10) Shuaib-Babata, Y. L.; Busari, Y. O.; Yahya, R. A.; Abdul, J. M.The inhibiting effect of cucumber peel and seed extracts on corrosion of AISI 1007 steel in 2M solution of Hydrogen Chloride (HCl) at ambient temperature was studied using gravimetric and electrochemical measurements (TAFEL polarization). It was observed that corrosion rates reduced with increase in the extracts’ concentration, and inhibition efficiency (IE%) increased with the concentration. The study revealed that the cucumber extracts possessed good inhibiting efficiency. Though, the cucumber peel extract’s efficiency was greater than that of the seed (oil) extract during gravimetric measurement. The highest inhibition efficiency (IE) of 86.63% was achieved using the cucumber peel extract as inhibitor with 1.0 g/l concentration, while cucumber seed (oil) extract recorded 39.23%. The electrochemical measurements (TAFEL polarization) results revealed that the corrosion current density decreased with the increased in the concentration of the cucumber peel extract. The decreased in corrosion was due to increased blocking of the metal surface by adsorption of the leaf extract. Therefore, the extracts could be used as a green inhibitor to the corrosion of AISI 1007 steel in the hydrochloric acid medium as a replacement for toxic inhibitors. Keywords: Tafel Polarization, Gravimetric, Current Density, Metal Surface Adsorption, Inhibiting EfficiencyItem Inhibitive Potential of Prosopis Africana on Corrosion of Low Carbon Steel in 1M Hydrochloric Acid Medium(Dhaka University of Engineering & Technology, Gazipur, Bangladesh, 2019) Shuaib-Babata, Y. L.; Ibrahim, K. H; Ambali, I. O.; Ajao, K. S.; Yahya, R. A.; Aremu, N. I.; Pelumi, A. A,Recently, there is quest for the use of inexpensive, non-toxic, non-biodegradable, readily available and environmentally acceptable corrosion inhibitor. Studies have shown that these properties could be achieved through the use of plants as inhibitor. Inhibiting effect of Prosopis Africana (Iron Tree) seed extracts were assessed on a sample of low carbon steel in 1M HCl with varying proportion of the seed extract using gravimetric, Tafel polarization and gasometrical measurement techniques. The results show that weight loss/corrosion rate decreases with increase in the extracts’ concentrations. Good inhibiting efficiency of Prosopis Africana extracts with optimum inhibiting efficiency of 97.7% at 1.0 g/l after 120 hours exposure in gravimetric measurement was attained. TAFEL polarization results revealed that the Prosopis Africana extract shows that the corrosion current density decreases with the increase in the concentration of the extract. The extract is found suitable as green inhibitor for corrosion of low carbon steel in the studied medium.Item Stress corrosion cracking of austenitic stainless steels in chloride environment(Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria, 2015) Ahmed, I. I.; Alabi, A. G. F.; Odusote, J. K.; Aremu, I. N.; Adebisi, J. A.; Yahaya, T.; Talabi, S. I.; Yahya, R. A.; Lyon, S. B.This study was carried out to assess the effect of applied potentials on Stress Corrosion Cracking (SCC) of Austenitic Stainless Steels (ASS), Type 304L in a potentiostatically controlled chloride environment at ambient temperature. The stress corrosion cracking tests were carried out on annealed ASS using a Slow Strain Rate Test (SSRT) technique in sodium chloride solution acidified with hydrochloric acid at ambient temperature. Analyses of failed specimens were carried out using optical microscope. The study showed that plastic elongation, ultimate tensile strength and time to failure decrease as the applied potential increases during the slow strain rate test. The study showed that immunity of ASS to chloride SCC was improved when the electrochemical potential was maintained in the primary passive potential range. Analysis of failed samples showed evidences of SCC.