Effects of two fungicides on the corrosion resistance of copper in 3.5% NaCl solution under various conditions

Effects of two fungicides (myclobutanil and hexaconazole) on the corrosion resistance of copper in 3.5% NaCl solution under various conditions were evaluated via weight loss, electrochemical techniques, SEM and EDS. Results show that these compounds act as mixed-type inhibitors, suppressing the charge transfer process by the adsorption on copper surface. Chemisorption between inhibitors and copper is accordance with the Langmuir adsorption isotherm. The corrosion resistance of copper with inhibitors under near neutral conditions is better than that under acidic or alkaline conditions. Good inhibition performances at different temperatures and during a long time of immersion are also observed.

Research highlights► Two novel compounds were studied as corrosion inhibitors for copper. ► Corrosion inhibition under various conditions was evaluated. ► Surface appearance after corrosion was investigated by SEM and EDS. ► Both of the compounds show extremely high inhibition efficiencies.