The inhibition efficiency (IE) of Polyacrylamide (PAA) in controlling corrosion of carbon steel in ground water in the absence and presence of Zn 2+ has been evaluated by weight loss method. The formulation consisting of 250 ppm PAA and 50 ppm Zn 2+ has 98% IE. It is found that the inhibition efficiency (IE) of PAA increases by the addition of Zn 2+ ion. A synergistic effect exists between PAA and Zn 2+. The mechanistic aspects of corrosion inhibition have been studied using polarization study.

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... Also FTIR spectra reveal that the protective film consists of Fe 2+-PAA complex and Zn (OH) 2. The scanning electron microscopy (SEM) study confirms the protection of carbon steel surface by strong adsorption of PAA. A suitable mechanism for corrosion inhibition is proposed based on the results from the above studies.