Inhibitive Characteristics of Irvingia Gabonensis Extract on Mild Steel Corrosion in Hydrochloric Acid
Cynthia Chinyere Onah, Department of Metallurgical and Materials Engineering, Enugu State University of Science and Technology, Agbani, Nigeria.
Christopher Nwankwo Mbah, Department of Metallurgical and Materials Engineering, Enugu State University of Science and Technology, Agbani, Nigeria.
Kingsley Chidi Nnakwo, Department of Metallurgical and Materials Engineering, Enugu State University of Science and Technology, Agbani, Nigeria.
Mild steel is corrosion susceptible in various environmental conditions especially in acidic medium, hence needs to be shielded from corrosive medium during industrial services. The main objective of the present research is to investigate the suitability of Irvingia gabonensis extract as an inhibitor for inhibition of mild steel corrosion in 1.5M HCl medium. The corrosion rate of the mild steel in 1.5M HCl without extract addition and the inhibitive characteristics of the Irvingia gabonensis extract were measured using weight loss technique. The extract was added to the 1.5M HCl in concentrations of 0.2, 0.5 and 1g/l. The corrosion rate was measured after immersion times of 2 h, 4 h, 6 h, 8 h, 10 h, and 12 h at temperatures of 26 and 30°C. The interaction between inhibitors and mild steel surfaces were determined using Langmuir adsorption isotherm. The weight loss measurement showed that the corrosion rate of mild steel without extract addition increased with increasing immersion time and temperature. In the presence of the extract, the corrosion rate decreased with immersion time but increased with a rise in temperature. The Irvingia gabonensis extract recorded maximum inhibition efficiency of 93.33% at 1g/l addition, an immersion time of 12 hrs and temperature of 26°C. The Langmuir adsorption isotherm plot indicated a strong adherence of the adsorption data to the assumptions confirming Langmuir adsorption isotherm. Based on the observed high inhibition efficiency, Irvingia gabonensis extract is quite suitable for effective protection of corrosion of mild steel in HCl environment.
Irvingia Gabonensis, Inhibition Efficiency, Mild Steel, Extract, Langmuir
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