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Influence of Chloride Ion on the Corrosion Inhibition Efficiency of the ATMP-Zn 2+ System
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Corrosion rates of carbon steel immersed in various concentrations of Cl- (100 ppm and 150 ppm) have been evaluated by weight loss method in the absence and presence of Amino (trimethylene phosphonic acid) ATMP and Zn2+. It is found that ATMP alone is corrosive at 100 ppm Cl- but at 150 ppm Cl- it shows some inhibition efficiency (IE) due to deposition of Cl- on metal surface. However interestingly, ATMP shows very good IE in the presence of Zn2+ at all concentrations of Cl-. A synergistic effect is noticed between ATMP and Zn2+. The protective film has been analysed by surface analysis techniques and a suitable mechanism of corrosion inhibition is proposed.
Keywords
Carbon Steel, Corrosion Inhibition, Chloride Environment, Phosphonic Acid.
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