Abstract
The effect of isomers of 3-pyridyl-substituted 1,2,4- and 1,3,4-thiadiazoles (3-PTHD and 3-PTH) on the corrosion of mild steel in acidic media (1M HCl and 0.5M H2SO4) has been investigated using weight loss measurements and electrochemical techniques (impedance spectroscopy and polarisation curves). A comparison of the results showed that 3-PTHD was the best inhibitor in both media. It is found to behave better in 1M HCl than in 0.5M H2SO4. Polarisation curves indicate that 3-PTH and 3-PTHD are mixed type inhibitors in 1M HCl, but in 0.5M H2SO4, the inhibition mode of these inhibitors depends on the electrode potential and they act essentially as cathodic inhibitors. Adsorption of 3-PTH and 3-PTHD on the mild steel surface in 1M HCl and 0.5M H2SO4 follows the Langmuir isotherm model. Molecular modelling has been conducted to correlate the corrosion inhibition properties with the calculated quantum chemical parameters.
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