Study of a Triazole Derivative as Corrosion Inhibitor for Mild Steel in Phosphoric Acid Solution

Abstract

The corrosion inhibition by a triazole derivative (PAMT) on mild steel in phosphoric acid (H3PO4) solution has been investigated by weight loss and polarization methods. The experimental results reveal that the compound has a significant inhibiting effect on the corrosion of steel in H3PO4solution. It also shows good corrosion inhibition at higher concentration of H3PO4. Potentiodynamic polarization studies have shown that the compound acts as a mixed-type inhibitor retarding the anodic and cathodic corrosion reactions with predominant effect on the cathodic reaction. The values of inhibition efficiency obtained from weight loss and polarization measurements are in good agreement. The adsorption of this compound is found to obey the Langmuir adsorption isotherm. Some kinetic and thermodynamic parameters such as apparent activation energy, frequency factor, and adsorption free energy have been calculated and discussed.

The Inhibition Effect of Heterocyclic Compounds towards the Corrosion of Metals in Different Media: over view

“…The multiple-linear regression analyses fitted the theoretical data well and the calculated inhibition efficiency of the compounds studied was found to be close to their experimental corrosion inhibition efficiencies especially in the protonated form [32]. The compound acts as a mixed-type inhibitor retarding the anodic and cathodic corrosion reactions with predominant effect on the cathodic reaction [33].…”

Protection of metals in phosphoric acid solutions by corrosion inhibitors. A review

“…Stronger interaction of steel surface and inhibitor is observed for S-containing compounds, such as allylthiourea ((-G ads ) = 37.6-40.4 kJ/mol) [78], 4-(N,Ndiethylamino)benzaldehydethiosemicarbazone (32-34 kJ/mol) [81], thiosemicarbazide and its derivatives (38-40 kJ/mol) [79], 1,2-bis(thiophen-2-ylidenemethyl)hydrazine (38 kJ/mol) [91], 3,4-dimethoxybenzaldehydethiosemicarbazone (40-43 kJ/mol) [82], benzothiazole derivatives (44.5-52.2 kJ/mol) [86], 4-amino-3-hydrazino-5-mercapto-1,2,4triazole (38.3 kJ/mol) [87], 3-phenyl-4-amino-5-mercapto-1,2,4-triazole (36.1 kJ/mol) [88], a thiophene derivative (38.3 kJ/mol) [89], that also inhibit steel corrosion better. The adsorption of these compounds obeys the Langmuir isotherm.…”

The thiazole and triazole derivatives as inhibitors of metal corrosion: Part I

“…Lin Wang [37][38][39] se pretežno bavi proučava-njem mogućnosti zaštite čelika od korozije u rastvoru fosforne kiseline primenom: 2-merkaptobenzoksazola [37], 3,5-Bis (n-piridil)-4-amino-1,2,4-triazola (n-PAT) [38], 3-fenil-4-amino-5-merkapto-1,2,4-triazola [39]. On u svojim radovima dolazi do vrlo sličnih zaključaka kao i pri primeni derivata triazola u rastvoru HCl.…”