Corrosion control of brass in groundwater by interface and interphase inhibitors

The inhibiting action of 2-mercaptobenzothiazole (MBT) and cetyl trimethyl ammonium bromided (CTAB) on the corrosion of brass in groundwater have been studied by open circuit potential and potentiodynamic polarization techniques. The results revealed that the inhibition occurred by blocking the reaction sites on the surface of brass via chemisorption of the inhibitors. The adsorption of both the compounds on brass surface in groundwater is found to obey Langmuir isotherm. The results also indicate that MBT functions predominantly as an anodic inhibitor whereas CTAB and the combination of MBT and CTAB (MBT + CTAB) behave as mixed type inhibitors.