The inhibitive effect of bta on the corrosion of copper rotating cylinder electrode in oxygenated 0.1m h2so4 under controlled conditions of mass transfer

Abstract EN

The inhibitive action of benzotrizole (BTA) on the corrosion of copper in oxygenated 0.1M sulfuric acid solution has been investigated using the rotating cylinder electrode to provide turbulent conditions.

Potentiostatic polarization measurements were carried out at different temperatures of 283, 288, 293 and 298K and various speeds of rotation, 100, 200, 300 and 400 rpm.

In general, BTA, at concentration of 0.01M, effectively inhibits the corrosion of copper in oxygenated 0.1M sulfuric acid solution.

Moreover, BTA effectively inhibits the anodic dissolution of copper and the cathodic reactions, i.e., HER and oxygen reduction reaction.

Therefore, BTA acts as a mixed inhibitor in oxygenated solutions. The overall percentage of inhibition efficiency is about 98% .

This indicates that a Cu-BTA film is developed on the copper electrode surface which about 98% of the corrosion rate .

The overall inhibition efficiency is neither affected by the turbulent flow rate , nor by the temperature increases. The corrosion rate is temperature dependent only, which indicates that the corrosion of copper in inhibited oxygenated 0.1M sulfuric acid solutions is under activation control.