Asian Journal of Research in Chemistry

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Influence of Chloride Ion on the Corrosion Inhibition Efficiency of the ATMP-Zn 2+ System


Affiliations
1 Periyar E. V. R. College, Trichirappalli, 620023, Tamilnadu, India
2 St. Joseph’s College, Trichirappalli, 620002, Tamilnadu, India
3 Servite College of Education Thogaimalai, Tamilnadu, India
4 Gandhigram Rural Institute, Tamilnadu, India
     

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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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  • Influence of Chloride Ion on the Corrosion Inhibition Efficiency of the ATMP-Zn 2+ System

Abstract Views: 246  |  PDF Views: 1

Authors

C. Thangavelu
Periyar E. V. R. College, Trichirappalli, 620023, Tamilnadu, India
P. Patric Raymond
St. Joseph’s College, Trichirappalli, 620002, Tamilnadu, India
S. Rajendran
Servite College of Education Thogaimalai, Tamilnadu, India
M. Sundaravadivelu
Gandhigram Rural Institute, Tamilnadu, India

Abstract


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.