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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(5) [September 2005] >
| Title: | Thiadiazoles-A potential class of heterocyclic inhibitors for prevention of mild steel corrosion in hydrochloric acid solution |
| Authors: | Quraishi, M A
Khan, S |
| Keywords: | Corrosion inhibition
thiadiazoles
mild steel
potentiodynamic polarization
langmuir adsorption isotherm |
| Issue Date: | Sep-2005 |
| Publisher: | CSIR |
| IPC Code: | C23F11/00 |
| Abstract: | Four organic
inhibitors namely 2-amino-1,3,4-thiadiazole (AT),
5-methyl-2-amino-1,3,4-thiadiazole (MAT), 5-ethyl-2-amino-1,3,4-thiadiazole
(EAT) and 5-propyl-2-amino-1,3,4-thiadiazole (PAT) were synthesized and their
influence on the inhibition of corrosion of mild steel (MS) in hydrochloric
acid was investigated by weight loss and potentiodynamic polarization
techniques. The inhibition efficiency (IE) of these compounds was found to vary
with the inhibitor concentration, immersion time, acid concentration and
solution temperature. All the investigated thiadiazoles exhibited good
inhibition efficiency (IE) for mild steel in hydrochloric acid solution. The
adsorption of all these compounds on mild steel in acid solution has been found
to obey Langmuir’s adsorption isotherm. The potentiodynamic polarization data
showed that the inhibitors are of mixed type. Various thermodynamic parameters
(Ea, ΔGads, ΔQ, ΔH, ΔS,
t1/2) have also been
calculated to investigate the mechanism of corrosion inhibition. |
| Page(s): | 576-581 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(5) [September 2005]
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