Corrosion inhibition of mild steel in acidic medium by some sulfa drugs compounds Cu+ 2 cation+ 3, 5-dimethyl pyrazole mixture as a corrosion inhibitor for carbon steel in sulfuric acid solution Effects of Cl−, NO 3− and SO 4 2− anions on the anodic behavior of carbon steel in deaerated 0.50 M NaHCO 3 solutions