The inhibition efficiency (IE) of Amino Trimethylene phosphonic acid (ATMP) in controlling corrosion of carbon steel immersed in ground water in the absence and presence of Zn 2+ has been evaluated by weight loss method. It is observed that the synergistic formulation consisting of 250 ppm ATMP and 10 ppm of Zn 2+ has 98% IE. Polarization study reveals that ATMP-Zn 2+ system functions as a cathodic inhibitor system. AC impedance study reveals that a protective film is formed on the metal surface.
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