Synthesis and Effect of Some 5-Alkyl-1,3,4-Triazole-2-Thione Derivatives on Corrosion Behavior of Molybdenum Electrode in Hydrochloric Acid

Abstract

A novel series of self-assembled surfactants derived from 5-alkyl-1,3,4-triazole-2-thione have been synthesized. The purity of surfactants synthesized was checked by rutinary methodologies (FTIR spectroscopy, ¹H-NMR, MS and elemental analysis). Their surface active properties at equilibrium in water at 25°C were determined. Also, the inhibitive effect of these compounds, in the case of molybdenum in acid medium, was investigated thoursough galvanostatic and galvanodynamic techniques. Galvanodynamic polarization data indicates that these surfactants act as very good inhibitors of molybdenum in hydrochloric acid both for cathode and anode. Galvanostatic measurement has the same trend of inhibitive effect as that of the galvanodynamic polarization data, which indicate the formation of a protective layer on the metal surface by the adsorption of surfactants molecules.

Keywords:

• Adsorption
• corrosion inhibition
• corrosion rate and inhibition efficiency
• surface tension
• synthesis of surfactants

Notes

ΔG_mic = [2.303 RT log CMC] – [log 55.5], G_ads = ΔG_mic–(0.6023 × 10⁻²) × Π_cmc × A_min.