Synthesis, Experimental and DFT Studies of Some Benzotriazole Derivatives as Brass C68700 Corrosion Inhibitors in NaCl 3 %

Corrosion inhibition potential of three synthesized benzotriazole (BTA) derivatives namely, 1-(prop-2-yn-1-yl)-1H-benzotriazole (Inh 1), 2-[2-(1H-benzotriazol-1-yl)ethyl]-1H-isoindole-1,3(2H)-dione (Inh 2) and 1-(4-nitrobenzyl)-1H-1,2,3-benzotriazole (Inh 3), on brass C68700 in NaCl 3 % was evaluated using potentiodynamic method. The results show that the examined molecules are good inhibitors for brass and behave as mixed type inhibitors. Inhibition efficiency (IE %) increases with the inhibitors concentration to reach 80.89 %, 83.70 % and 92.13 % at 15 ppm for Inh 1, Inh 2 and Inh 3 respectively. Additionally, the calculated DFT descriptors are in good agreement with the experimental inhibition efficiencies.

Automated summary

The three synthesized benzotriazole derivatives show good inhibition potential for brass in a 3% NaCl solution, acting as mixed-type inhibitors. The inhibition efficiency increases with the concentration of inhibitors, reaching high levels for all three compounds. Additionally, the calculated DFT descriptors are consistent with the experimental inhibition efficiencies.