[a] Department of Chemistry, Surya Polytechnic College, Villupuram - 605652, Tamil Nadu, India.
[b] PG and Research Department of Chemistry, Periyar E.V.R College, Trichy - 620023,
Tamil Nadu, India .
[c] Department of Chemistry, Jeppiaar Engineering College, Chennai- 600119, Tamil Nadu, India.
[d] Corrosion Research Center, Department of Chemistry, RVS School of Engineering and
Technology, Dindigul – 624005, Tamil Nadu, India.Email: email@example.com
Corresponding Author: Email : firstname.lastname@example.org
The corrosion inhibition effect of carbon steel in 60 ppm of chloride ion environment by 2-chloroethylphosphonic acid (2-ClEPA)- Ni2+ system has been investigated using classical weight loss method. The results show that 32% inhibition efficiency (IE) achieved with binary system consisting of 100 ppm of 2-ClEPA and 50 ppm of Ni2+. The addition of 50 ppm of sodium gluconate (SG) on 2-ClEPA- Ni2+ system increased the IE from 32% to 98%. FTIR investigate the nature of the protective film formed on the metal surface. The protective film consists of Fe2+–2-ClEPA complex, Fe2+–SG complex and Ni(OH)2. SEM and AFM used to prove the formation of protective film. EDS study determines the elements of inhibitor present on the metal surface. The mechanistic aspects of corrosion inhibitionbased on the results obtained from the classical weight-loss method and the electrochemical method such as AC impedance and polarization study.
KeyWords:Carbon steel, 2-chloroethylphosphonic acid, sodium gluconate, Inhibition efficiency, protective film;