3.
Comparison of Azo Polyesters and Their Monomer Precursors on
Corrosion of Mild Steel in Acid Medium
S.Chitra a, K.Parameswari
a, B.Gayathri a and A.Selvaraj
b
aDepartment
of Chemistry, P.S.G.R.Krishnammal College for Women,
Coimbatore-641004, India.
bDepartment
of Chemistry,CBM College, Sakethapuri, Kovaipudur,
Coimbatore-641042, India.
Abstract:
Comparison of azo polyesters and their
monomer precursors on corrosion of mild steel in acid medium
has been studied by electrochemical and non-electrochemical
techniques. The result of the study revealed that the
inhibition efficiency of the polyesters vary with
concentration and temperature. Values of activation energy
of inhibited solution were greater than the value obtained
for blank. Thermodynamic consideration revealed that the
adsorption of polyesters on mild steel surface was
spontaneous and occurred according to Langmuir adsorption
isotherm. Physical adsorption mechanism has been proposed
for the adsorption of the inhibitors. Polarization data
indicated that the polyesters behave as mixed type
inhibitors but slightly cathodic in nature. The synergistic
influence of halide ions and CTAB has been evaluated by
weight loss method. The surface morphology of mild steel
specimen was evaluated using optical microscope.
Keywords: Corrosion, Inhibitors, Polyesters, CTAB, Optical
microscope.
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