The Open Corrosion Journal

2009, 2 : 77-82
Published online 2009 March 13. DOI: 10.2174/1876503300902009077
Publisher ID: TOCORRJ-2-77

Eosin as Corrosion Inhibitor for Carbon Steel in Well Water

J. Sathiyabama , Susai Rajendran , J. Arockia Selvi and J. Jeyasundari
Corrosion Research center, Department of Chemistry, GTN Arts College, Dindigul-624005, Tamil Nadu, India

ABSTRACT

The inhibition efficiency of Eosin in controlling corrosion of carbon steel immersed in well water, has been evaluated by mass loss method both in absence and presence of zinc ion. A synergistic effect exists between Eosin (EN) and Zn2+. The inhibition efficiency (IE) of the EN – Zn2+ system decreases with increase in immersion period. Addition of N-cetyl-N,N,N-trimethylammonium bromide (CTAB), sodium dodecyl sulphate (SDS), sodium sulphite (Na2SO3) does not change the excellent inhibition efficiency of the EN-Zn2+ system. Polarization study suggests that the EN-Zn2+ system functions as an anodic inhibitor system. AC impedance spectra reveal the presence of a protective film on the metal surface. FTIR spectra indicate that the protective film consists of Fe2+ - EN complex and Zn(OH)2.

Keywords:

Carbon steel, corrosion inhibition, eosin, dyes and synergistic effect.