Abstract
The effect of isomers of 2,5-bis( n-pyridyl)-1,3,4-thiadiazole ( n-PTH) on the corrosion of mild steel in perchloric acid solution (1 M HClO 4) has been investigated using weight loss, electrochemical impedance spectroscopy and potentiodynamic polarisation. Inhibition efficiency is dependent upon the thiadiazole structure, with 3-PTH serving as a better inhibitor than 2-PTH. 2-PTH stimulates corrosion at low concentrations. Polarisation curves indicate that 3-PTH acts as an anodic-type inhibitor whereas 2-PTH is of the cathodic-type. X-ray photoelectron spectroscopy were also carried out to establish the mechanism of corrosion inhibition of 3-PTH and stimulation corrosion of 2-PTH of mild steel in acid solution. Adsorption of 3-PTH on the mild steel surface in 1 M HClO 4 follows the Langmuir adsorption isotherm model.
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