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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 CodeC23F11/00
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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