Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/9517
Title: Inhibition of mild steel corrosion in formic and acetic acid solutions
Authors: Quraishi, M A
Sharma, H K
Keywords: Corrosion inhibitor
mild steel
triazoles
acetic acid
formic acid
Issue Date: May-2004
Publisher: CSIR
Series/Report no.: C23F 11/04
Abstract: Four organic inhibitors namely, 4-amino-3-methyl-5-mercapto-1,2,4-triazole (AMMT), 4-amino-3-ethyl-5-mercapto-1,2,4-triazole (AEMT), 4-amino-3-propyl-5-mercapto-1,2,4-triazole (APMT) and 4-amino-3-butyl-5-mercapto-1,2,4-triazole (ABMT) were synthesized to investigate their inhibiting actions on corrosion of mild steel (MS) in aqueous solutions containing 20% formic acid and 20% acetic acid by weight loss and potentiodynamic polarization methods. All of these compounds have shown good inhibition efficiency (<i>IE</i>) in the formic acid and acetic acid solutions. <i>IE </i>of these compounds has been found to vary with the concentration of the compounds, temperature, immersion time and concentration of acid solutions. The adsorption of these compounds on the mild steel surface from both the acids has been found to obey Langmuir adsorption isotherm. The values of activation energy (<i>E</i><sub>a</sub>) and free energy of adsorption (<img src='/image/spc_char/delta.gif' border=0><i>G</i><sub>ads</sub>) indicated physical adsorption of these compounds on the steel surface. The potentiodynamic polarization experiments revealed that all the compounds are mixed type inhibitors.
Description: 331-336
URI: http://hdl.handle.net/123456789/9517
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.11(3) [May 2004]

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