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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 18, No. 1, 2014, pp. 63-69
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Bioline Code: ja14009
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 18, No. 1, 2014, pp. 63-69
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Synthesis and characterization of 4-[(E)-(-2,5- dimethoxybenzylidene)amino] benzoic acid Schiff base and evaluation as corrosion inhibitor of steel in 2.0 M H2SO4.
ECHEM, OGBONDA G; OFORKA, NC & ABOSEDE, JAMES
Abstract
The synthesis of 4-[(E)-(-2,5- dimethoxybenzylidene)amino] benzoic acid
Schiff base, SBDAB was carried out inorder to determine its inhibitory efficiency at higher
temperature using weight loss and gasometric techniques. The results showed that the
inhibition efficiency of the studied Schiff base increased with increase in temperature for the
corrosion of mild steel which suggests chemisorption reaction mechanism. The negative free
energy of adsorption obtained confirms a spontaneous adsorption of the Schiff base on the
metal surface. The positive values of the heat of adsorption suggest an endothermic reaction.
The positive values of the entropy of adsorption suggest a disordered system. The Langmuir
adsorption Isotherm result showed a deviation from an ideal Langmuir adsorption isotherm
equation, this is due to the interaction of the inhibitor molecules with one another. The
inhibition efficiency of 35.20% and 35.31% was obtained for the weight loss and gasometric
techniques respectively. The plots of log(wi - & #916;w) against time gave linear graph which
confirms a first order reaction mechanism.
Keywords
Schiff base; corrosion; chemisorption; weight loss and gasometric technique
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© Journal of Applied Sciences and Environmental Management
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