Effect of Benzotriazole on Dissolution of Copper in the Presence of Fluid Flow: I . Experimental

Abstract

The influence of benzotriazole anodic behavior of copper in was investigated experimentally under conditions of high rate dissolution and in the presence of fluid flow. Results, which include both electrochemical measurements and visual observations, suggest that during dissolution a dual layer forms on the surface. An inner barrier layer, which imparts to benzotriazole its useful property of inhibition, was found to conduct by a high field mechanism. The thickness of the inner layer varied linearly with applied potential, indicating that the field strength in the film remained constant. An outer layer, which consists of a porous film of copper benzotriazolate, was found to respond to hydrodynamic conditions. The outer film is responsible for deviations in mass‐transfer rate from the Levich equation during dissolution experiments with a rotating disk electrode.