CORROSION INHIBITION BY TRISODIUM CITRATE (TSC – Zn2+ SYSTEM)

B Shyamala Devi, S Rajendran

Abstract


The inhibition efficiency (IE) of various concentrations of a TSC- Zn2+ system in controlling corrosion of mild steel immersed in well water was evaluated by a weight-loss study.  The formulation consisting of 50ppm of TSC and 25 ppm of Zn2+ showed 70% inhibition efficiency.  A synergistic effect was noticed between Trisodium citrate  - Zn2+ system.  In the presence of Zn2+ TSC has excellent inhibition efficiency.  Polarization studies reveal that TSC-  Zn2+ function as a mixed inhibitor.  AC impedance spectra suggest that a protective film is formed on the metal surface.  FTIR spectra reveal that the protective film consists of Fe2+ -TSC complex and Zn(OH)2.  SEM micrographs and AFM reveals that a protective film is formed on the metal surface


Full Text:

PDF


DOI: http://dx.doi.org/10.17628/ecb.2012.1.150-157

Refbacks

  • There are currently no refbacks.


 

*********************** European Chemical Bulletin *******************