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Inhibitory action of Thiazole and Triazole on mild Steel Corrosion in Hydrochloric acid Solutions

Author Affiliations

  • 1Department of Chemistry, Arts, Science and Commerce College Kholwad, Kamrej Char Rrasta, Surat, 394185, INDIA

Res.J.chem.sci., Volume 5, Issue (3), Pages 30-36, March,18 (2015)


Thiazole [3-(piperazin-1-yl)benzo(d)isothiazole] and Triazoles (Hydroxybenzotriazole) were used as corrosion inhibitors for mild steel in hydrochloric acid solution. The inhibition efficiency depended on the concentration and type of the thiazole and triazoles. The inhibition efficiency ranged between 66 to 77 % at the highest concentration (25 mM), and between 33 to 44% at the lowest concentration (5 mM) of inhibitor in 1 M HCl solution. Inhibition efficiency decreased with rise in temperature, this corresponded to surface coverage of the metal by the inhibitor. The results also showed that, the inhibitors were adsorbed on the mild steel surface according to Langmuir, Temkin’s and Frundlich adsorption isotherm.


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