Effect of Two Triazole Thione Derivatives on Corrosion Behavior of Molybdenum in 0.01M HCL

Abstract

4N-(2-hydroxy-3-triethyl ammonio-propyl-) fatty-1, 2, 4 triazole-3-thione (12AB) and 2,4N-(bis-2-hydroxy-3-triethyl ammonio-propyl-) fatty-1, 2, 4 triazole-3-thione (12ABB) were synthesized, characterized and tested as surfactant corrosion inhibitors for Mo in 0.01 M HCl solution using galvanostatic, potentiodynamic and potentiostatic polarization techniques. Concentrations of the inhibitors were ranged from 1x10 −6 to 1 (wt. %). The obtained results using galvanostatic polarization on bare metal showed that thickness of adsorbed layer decreased with increasing concentration of 12AB while adverse trend was observed with 12ABB. On the other hand the anodic oxide film formed at 100mAcm-2 up to 0.268V (SCE) was susceptible to a dissolution process with the presence of two corrosion rates for each concentration of the two additives. Potentiodynamic polarization illustrated that increase of additive concentration lowered corrosion current densities affecting anodic reaction more than cathodic one. The protection efficiency increased with increasing inhibitor concentration. The low values of IE. % indicated the presence of electrostatic attraction between inhibiting molecules and the electrically charged surface of metal. Adsorption followed the kinetic thermodynamic model, Langmuir and Flory-Huggins adsorption isotherms. 12ABB showed better inhibiting action than that of 12AB due to the presence of two side chains in its structure. Potentiostatic polarizations indicated that when the concentration of the additives 12AB and 12ABB exceeded a critical value, ≥0.1Wt.%, no inhibition effect.

The Effect of Triazole Thione Derivative on the Corrosion of Iron in Hydrochloric Acid Solutions

“…where is a degree of coverage ( = IE %/100 Ө Ө (34) ), y is the number of inhibitor where Cinh, is the molar concentration of the inhibitor (35) . A straight line relationship with a slope of 0.1385 was observed (Figure 4).…”

Comparative Electrochemical study of niobium, molybdenum, cobalt chromium alloy and gold electrodes in milk and tap water

“…Due to its high melting point and tensile strength, molybdenum has the potential to be a highly creep-fatigue-resistant metal [9]. Due to the oxide's compact and flawless structure, it forms a highly stable oxide film in aqueous solutions [10,11]. Mo's high tensile strength values allow for stents to have thinner struts, which improves flexibility and allows for access to vessels with narrower bores [12].…”