Abstract
The inhibition efficiency of polyvinylalcohol (PVA) in controlling corrosion of aluminium in well water in the absence and presence of Zn 2+ has beenevaluated by weight loss method. The formulation consisting of 250 ppm of PVA and 25 ppm of Zn 2+ offers 85 % inhibition efficiency. It is found that the inhibition efficiency of PVA increases by addition of Zn 2+ ion. A synergistic effect exists between PVA and Zn 2+. The mechanistic aspects of corrosion inhibition have been studied using polarization study. Also FTIR spectra reveal that the protective film consists of PVA - Zn 2+ complex and Zn(OH) 2 . The scanning electron microscopy confirms the protection of aluminium surface by strong adsorption of PVA. A suitable mechanism for corrosion inhibition is proposed based on the results from the above studies.
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