Corrosion inhibition properties of the combined admixture of thiocarbanilide and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions
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The synergistic effect of the combined admixture of thiocarbanilide and
hexadecyltrimethylammoniumbromide on the electrochemical corrosion behavior
and inhibition of mild steel in 1 M H2SO4 and HCl acid media was evaluated through
weight loss analysis, potentiodynamic polarization technique, and IR spectroscopy.
Results show that the admixture performed effectively in both acid solutions with
an average HTH inhibition efficiency of 86.2 and 82% in H2SO4 acid from weight
loss and potentiodynamic polarization test while the corresponding values in HCl
acid are 79 and 80%, respectively. Thermodynamic calculations showed that the
compound chemically adsorbed onto the steel surface blocking the diffusion of
corrosive anions and simultaneously suppressing the redox electrochemical process
responsible for corrosion. Infrared spectroscopic images revealed the presence of
the functional groups of the organic compound responsible for corrosion inhibition
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology