Studies of Benzotriazole and Tolytriazole as Inhibitors for Copper Corrosion in Deionized Water

Abstract

The inhibition efficiencies of benzotriazole (BTA) and tolytriazole (TTA) on copper in deionized water were investigated. The inhibition effects of BTA and TTA were evaluated from polarization curves. Coupon tests established that the inhibition efficiency was concentration, temperature, and time-dependent. Effective inhibition to copper was observed when TTA or BTA (>6 ppm) was added to deionized water. TTA showed more effeciency and persistence for inhibiting the corrosion of copper under selected conditions, which may be attributed to its increased film hydrophobicity. The thermodynamic parameters of BTA and TTA adsorption were calculated.