The Corrosion Inhibition of Copper by some Azole Derivatives In Sodium Chloride Solution

摘要

The corrosion of copper in aqueous environments has attracted the attention of many investigators due to the increasing use of copper and its alloys in many industries. The inhibition of corrosion of copper in 3.4 percent sodium chloride solution containing various concentration of sulfamethoxazole, sulfisoxazole, sulfamethizole and sulfadoxine has been investigated. The inhibition efficiency has been evaluated by weight loss and electrochemical polarisation techniques. Morphology of the copper specimen after corrosion in the presence and absence of inhibitors were examined by using scanning electron microscopy. The inhibition efficiency increased with increasing of concentration of inhibitors. At the concentration of 40 ppm, the efficiency of inhibition for copper is In. order, sulfamethizole>sulfadoxine>sulfisoxazole>sulfamethoxazole. It shows that water soluble thin film of inhibitor is formed on the surface by a surface reaction of metal ion of specimen with adsorbed inhibitor molecules and that film act as a protective barrier against corrosive environment.