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Abstract

Dithizone and thiosemicarbazide were investigated as inhibitors of the corrosion of type 304 stainless steel in 1·0M sulphuric acid solution by studying weight loss, polarisation curves, and polarisation resistance and using scanning electron microscopy and Auger electron spectroscopy. Various corrosion parameters such as Tafel slopes, corrosion rate, heat of adsorption, and activation energy were evaluated to understand the inhibition mechanism. Inhibition efficiency increased with an increase in concentration of both inhibitors and decreased with an increase in temperature. Both inhibitors seemed to obey the Langmuir adsorption isotherm equation. Dithizone was chemisorbed, whereas thiosemicarbazide was physisorbed on the surface of type 304 stainless steel. Dithizone acted as a mixed inhibitor, while thiosemicarbazide was cathodic in nature.

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Dithizone and thiosemicarbazide as inhibitors of corrosion of type 304 stainless steel in 1·0M sulphuric acid solution

Abstract

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References