Prevention of mild steel corrosion by benzoic hydrazide in acid medium
G. Kuma 1T. Rajarajan A. Loganathan
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作者信息
1. Department of Biochemistry, Selvam Arts & Science College, Namakkal 637 003, Tamil Nadu, INDIA
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Abstract
The inhibition effect of benzoic hydrazide on the corrosion of mild steel in acid medium has been studied by mass loss and polarization techniques between 303K and 333K. The inhibition efficiency increased with concentration of inhibitor and temperature. At 333K the inhibition efficiency decreased. The corrosion rate increased with temperature and decreased with increase in concentration of inhibitor. The adsorption of this compound has been found to obey Temkin's adsorption isotherm. Potentiostatic polarization revealed that benzoic hydrazide is a mixed type inhibitor. The values of activation energy (E_a) and free energy of adsorption (triangle open G_(ads)) were also calculated.
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