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

Abstract Corrosion inhibition potential of three synthesized benzotriazole (BTA) derivatives namely, 1‐(prop‐2‐yn‐1‐yl)‐1 H ‐benzotriazole (Inh 1), 2‐[2‐(1 H ‐benzotriazol‐1‐yl)ethyl]‐1 H ‐isoindole‐1,3(2 H )‐dione (Inh 2) and 1‐(4‐nitrobenzyl)‐1 H ‐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.