Cu+2 cation+3,5-dimethyl pyrazole mixture as a corrosion inhibitor for carbon steel in sulfuric acid solution

The inhibition effect of [Cu+2 cation + 3,5-diinethyl pyrazole] mixture of different molar ratios on the corrosion of carbon steel in a 0.5 M H2SO4 so lution was studied using both weight loss and galvanostatic polarization te chniques. The inhibiting solutions were analyzed using UV-visible spectroph otometric before and after polarization measurements. The results revealed a complex formation between the two components, which was much more effecti ve than the inhibiting action of each additive separately. The inhibition m echanism was discussed depending on the results derived from both corrosion and UV-visible spectrophotometric measurements as well as conductometric i nvestigations. (C) 2001 Elsevier Science B.V. All rights reserved.