Abstract
In this study, the adsorption and corrosion inhibitive properties of ethanol extract of Dialium guineense leaves for mild steel in 0.5M HCl was studied using gravimetric method. The results obtained showed that the ethanol extract of Dialium guineense leave is a good adsorption inhibitor of Mild Steel in 0.5M HCl. The inhibition efficiency was found to increase with increase in the concentration of ethanol extract of Dialium guineense leave but decreased as the temperature increases. The inhibition efficiency increases up to a maximum of 92%. The kinetic study was found to follow pseudo first order reaction with high correlation. Thermodynamic consideration reveals that adsorption of ethanol extract of Dialium guineense leaves on mild steel surface is exothermic, spontaneous and fitted the Langmuir adsorption isotherm. The value of activation energy and Gibb’s free energy obtained were within the range of limits expected for the mechanism of physical adsorption.
 Adeniji, E. S. | Department of Chemistry, Ahmadu Bello University (ABU) Zaria, Kaduna State, Nigeria
Highlights
Corrosion is the deterioration of a metal due to its interaction with the environment such as water, acid, alkaline, air etc
Mild steel corrosion behavior in 0.5M HCl was investigated in the absence and presence of Dialium guineense extract using weight gravimetric method
The variation of weight loss with time for the corrosion of mild steel in 0.5M HCl containing different concentration of ethanol extract of Dialium guineense leaves at 303k is shown in the figure 1 below; 2.5
Summary
Corrosion is the deterioration of a metal due to its interaction with the environment such as water, acid, alkaline, air etc. Some of the synthetic organic compounds that show good anti-corrosive activity are highly toxic to cause hazards to both human and the environment during their application by Chinweuba (2014). The environmental hazards caused by the use of synthetic inhibitors had always been a global issue Because of their hazardous nature, researchers focus their attention on developing cheap, non-toxic, biodegradable and environment friendly natural products of plant origin as corrosion inhibitors (Fouda et al, 2014). The use of plant extract as corrosion inhibitors has been reported to be environmental friendly, readily available, renewable and acceptable source of a wide range inhibitor by some researchers (Abdallah 2004; Abiola et al 2007; Bendahou et al.,2006; Chetouani et al 2004; Rajendran et al 2005; Sethuraman and Bothi Raja 2005). This study aimed to investigate the inhibitive properties of Dialium guineense leaf extracts for corrosion of mild steel in 0.1MHCl using gravimetric techniques with and without the extract at 303K and 333K
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