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Volume 3 Issue 1

The inhibition capability of aqueous extract of Codiaeum variegatum Brilliantissima - Zanzibar (Wire Croton - WC), (CVB-WC) on mild steel corrosion in 1 M HCl solution was studied using electrochemical polarization, Scanning Electron Microscopy (SEM), Fourier Transform-Infrared Spectrum (FT-IR) analysis and Gas Chromatrography-Mass Spectrometry (GC-MS) analysis. The inhibition efficiency extrapolated from potentiodynamic polarization curves showed that cold water extract of CVB-WC behaved mostly as mixed-type inhibitor in hydrochloric acid. Scanning electron microscopy was used to characterize the surface morphology of uninhibited and inhibited mild steel specimens and the results show a remarkable inhibition of the corrosion process in the presence of the inhibitor. Analysis of the peaks of Fourier Transform-Infrared Spectrum (FT-IR) of the inhibitors indicated presence of functional groups containing Phosphorus, Oxygen, Nitrogen, -OH and -COOH while the peaks of the Gas Chromatrography - Mass Spectrometry (GC-MS) analysis is in agreement with the results of the FT-IR and indicate the presence of corrosion inhibiting compound such as Terpenes, Tannin, Alkaloid, Flavonoid and Phytate in different appreciable concentrations. An inhibition efficiency of 94.9 and 96.1% is reported for 16 and 67% volume concentration of the inhibitor from the electrochemical analysis.
Author(s) and Download Link
Vincent Onuegbu Izionworu, Yamainian Tadaerigha Puyate and Wan Mohd Norsani Wan-Nik
Journal of Newviews in Engineering and Technology (JNET), March, 2020 pp1-11 [Online Full Text] of
A Study of Wire Croton as an Inhibitor of Mild Steel in HCL Using Electrochemical – SEM – GCMS and FTIR Measurements
Evaluation of the Corrosion inhibition effect of aqueous extract of Codiaeum Variegatum Brilliantissima - Zanzibar (Wire Croton) on mild steel corrosion in an environment of 1 M HCl base stock solution was studied using gravimetric measurement. The work evaluated the effect of immersion time and concentration of inhibitor on the performance of crude extract of CVB-WC as an inhibitor of mild steel corrosion in 1 M HCl environment. The result showed that the surface coverage was close to unity indicating an effective inhibitor with a high inhibition efficiency of 96 – 99%. It is also established that CVB-WC inhibition action is dependent on concentration and time of immersion. Furthermore, the weight loss results are in consonance with the established facts that CVB-WC has compounds that contain –OH, -HN2, - COOH, -COOC2H5, functional groups and heteroatoms, N, O, P that provide the linking bridge to physisorption and chemisorption adsorption processes.
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Izionworu, Vincent Onuegbu*; Ikenyiri, Patience Nne and Chie-Amadi, Grace Orluma,
Journal of Newviews in Engineering and Technology (JNET), March, 2021 pp12-20 [Online Full Text] of
Evaluation of Codiaeum Variegatum Brilliantissima - Zanzibar as an Inhibitor of Mild Steel Corrosion in 1 M HCl Using Gravimetric Method
Nigeria has acquired and is maintaining the status of one of the leading producers of oil and gases with estimated annual spends of over 20 Billion Dollars in the upstream sector activities. However, it is only a small portion of this that is domiciled locally. This is even though some of the inputs used in the industry can be sourced locally. It was this situation that gave rise to the NOGIC Act which mandated that some inputs like chemical/additives must have a 60% local sourcing threshold. Starch, a cassava product is one of such additives used in the industry. Copious works in literature have established a promising potential for Nigerian cassava starch as a substitute for the imported starch in the industry, for improvement of the rheological and filtration rate properties of water-based drilling fluids. Curiously, all the starches used in the industry to date are wholly imported even with the fact of Nigeria being the world’s largest producer of cassava. Therefore, there is a challenge, a gap occasioned by the ready susceptibility of cassava starch to post-harvest physiological degradation. The treatment of these starches with preservatives will, therefore, address the gap.
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Nwosu, B. F. C., Ademiluyi F.T., Akpa J. G., and Abowei M. F. N.
Journal of Newviews in Engineering and Technology (JNET), March, 2021 pp21-33 [Online Full Text] of
Review of the Effect of Preservatives on the Stability of Cassava Starch-Bentonite Muds for Water-Base Drilling Fluid Formulations.
The inhibitive effect of breadfruit (Artocarpusaltilis) extract on the corrosion of mild steel in hydrochloric acid solution was investigated. Liquid from breadfruit leaves was extracted via solvent extraction method. Gravimetric and electrochemical techniques were used to test the effectiveness of the extract as corrosion inhibitor at 0.1-0.5g/L of the extract in solution of 0.5M hydrochloric acid. Both methods showed that increase in the extract concentration in acidic environment, enhanced the inhibition efficiency of Artocarpusaltilis extract. Although increase in exposure time slightly affect the inhibition process, but addition of the extract reduces the corrosion rate of mild steel. From the gravimetric method, the corrosion rate of mild steel in the acid solution after 10 hours was 6.815mm/yr for control sample, but reduced to 1.862mm/yr after the addition of 0.5g/L concentration of breadfruit. Also, in polarization method, the corrosion rate obtained as 2.209mm/yr for control sample reduced to 0.283mm/yr for sample inhibited with 0.5g/L extract. Similarly, the inhibition efficiency of breadfruit leaves extract increased with increase in extract concentration for both measurement methods. The maximum inhibition efficiency of 82.15 was recorded for the gravimetric method, whereas, 87.19% was obtained from the polarization method, showing that inhibition efficiency is higher with the polarization method. Nevertheless, both techniques indicate that breadfruit leaves extract is a good inhibitor for mild steel in acidic medium, which acts as mixed-type inhibitor. Therefore, the utilisation of breadfruit leaves extract will help reduce failure of equipment and expenses incurred in production industries as a result of corrosion.
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Oruene, D. W., Isaac, O. E, and Nkoi, B.
Journal of Newviews in Engineering and Technology (JNET), March, 2021 pp34-43 [Online Full Text] of
The Inhibition Effect of Breadfruit Leaf Extract on Mild Steel Corrosion

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