School of Egineering and Engineering Technology

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Browsing School of Egineering and Engineering Technology by Subject "Codiaeum variegatum brilliantissima – Zanzibar"

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    Thermodynamic and adsorption evaluation of codiaeum variegatum brilliantissima - Zanzibar as inhibitor of mild steel corrosion in 1 M HCl
    (Rivers State University, 2020-12) Izionworu, Vincent Onuegbu; Oguzie, Emmanuel Emeka; Arukalam, Okechi Innocent
    This study evaluated the thermodynamic and adsorption properties of aqueous extract of Codiaeum Variegatum Brilliantissima - Zanzibar (Wire Croton) as an inhibitor of mild steel corrosion in 1 M HCl base stock solution using gravimetric measurement focused on the effect of immersion time, inhibitor concentration and temperature. The result showed that the adsorption of the cold aqueous extracts of Wire Croton on mild steel surface favored Langmuir adsorption isotherm as supported by an overall correlation coefficient (R2) close to unity. The equilibrium constant of adsorption process (Kads) for Wire Croton inhibitor evaluated mathematically is 0.0106, 0.0131, 0.1276, 0.1171 and 0.0269 (mg/L) with free energy of adsorption (∆Goads) values of 1.345, 0.821, -5.256, -5.182 and -1.445 kJ/mol for concentrations of 73.6, 147.2, 220.8, 294.4 and 368 mg/L exposed to 303, 313, 323, 333 and 343 K respectively. The small values of Kads suggest weak adsorption which is corroborated by the low negative values of the free energy of adsorption, ∆Goads, values obtained from thermodynamic measurements. The adsorption of Wire Croton inhibiting particles on the mild steel surface was favorable from thermodynamic point of view since values of ∆Goads for more concentrations of the inhibitor were negative and provided proof that aqueous extract of the inhibitor is an efficient inhibitor. 1 Zanzibar as Inhibitor of Mild Steel Corrosion in M HCl. Journal of Newviews in Engineering and Technology. 2(4), 1 – 13. 1. INTRODUCTION: Corrosion continuous to pose serious challenge to infrastructure causing loss in revenue (Izionworu et al., 2021; NACE, 2016). The use of inorganic and organic inhibitors such as volatile inhibitors, Passivating inhibitors, Film inhibitors and Cathodic inhibitors has been welcomed in the past, particularly in the oil and gas field operations where they have yielded positive results in terms of reduced failure of installations and hence increased revenue. Although some level of successes has been recorded in the use of inorganic and organic inhibitors in corrosion control according to Chauhan et al. (2021), there are issues around their environmental suitability and health implications (Finsgar & Jackson, 2014; Umoren & Solomon, 2014).