Evaluation of inhibitors and biocide on the corrosion control of copper in neutral aqueous environment

Polarisation and impedance measurements were performed on copper in neutral aqueous solution with and without inhibitors and biocide. The inhibitors used were 3-benzylidene amino 1,2,4-triazole phosphonate (BATP), 3-cinnamalidene amino 1,2,4-triazole phosphonate (CATP), 3-salicylalidene amino 1,2,4-triazole phosphonate (SATP) and 3-paranitro benzylidene amino 1,2,4-triazole phosphonate (PBATP). Effect of inhibitors and biocide against the corrosion of copper in neutral aqueous solution has been studied. Results elucidate the minimal interference between biocide and inhibitors system. Surface evaluation techniques like FT-IR, XRD and EDXA were used to determine the nature of the protective film formed on the metal surface.