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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.11 [2004] >
IJCT Vol.11(3) [May 2004] >
| 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 |
| IPC Code: | 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 (IE) in the formic acid and acetic acid solutions.
IE 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 (Ea) and free energy of adsorption ( Gads) indicated physical
adsorption of these compounds on the steel surface. The potentiodynamic
polarization experiments revealed that all the compounds are mixed type
inhibitors. |
| Page(s): | 331-336 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.11(3) [May 2004]
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