Benzotriazole as a corrosion inhibitor for brass

Abstract

The effect of benzotriazole (BTA) on the corrosion of brass in 0.1 N HCl, 0.1 N H₂SO₄ and 0.1 N NH₄Cl was studied by means of immersion tests and galvanostatic measurements. BTA showed a good inhibition effect in some corrosive media. The percentage inhibition in 0.1 N HCl solution was found to increase with increasing BTA concentration. In contrast, the percentage inhibition in 0.1 N H₂SO₄ was inversely proportional to the BTA concentration. The highest inhibition efficiency was obtained in 0.1 N NH₄Cl. The role of BTA as an inhibitor for brass was explained in terms of the chemisorption of BTA molecules at some active sites on brass surfaces.