Abstract

CORROSION INHIBITION OF CARBON STEEL IN WELL WATER BY TRISODIUM CITRATE – CU2+ AS INHIBITOR

N. Vijaya*, A. Peter Pascal Regis, J. K. Alphonsa Juliet Helina, R. Betsy Clarebel, S. Rajendran

ABSTRACT

The inhibition efficiency (IE) of Trisodium citrate-Cu2+ system in controlling of corrosion of carbon steel in well water has been determined by weight loss method. The experiment was carried out by varying the immersion period and concentration of the inhibitor at room temperature. A synergistic effect exists between TSC and Cu2+ ion. The inhibitor system TSC-Cu2+ consisting of 250ppm of TSC and 50ppm of Cu2+ion showed 86% of IE. The FTIR spectra revealed the formation of the protective film on the metal surface consists of Fe2+ -TSC and Cu(OH)2. The formation of protective film was confirmed by the electrochemical studies such as polarization study, UV-Visible spectra, AC impedance, SEM and AFM.

Keywords: Corrosion, carbon steel, Trisodium citrate- Cu2+, SEM, AFM, AC impedance.