Corrosion inhibition studies of the combined admixture of 1,3-diphenyl-2-thiourea and 4-hydroxy-3- methoxybenzaldehyde on mild steel in dilute acid media
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The electrochemical corrosion inhibition
properties of the combined admixture of 4óHq
diphenylqxqthiourea and áqhydroxyqHq
methoxybenzaldehyde on mild steel in 4 M
)xSOá and )õl acid media were studied
through weight loss analysisó potentiodynamic
polarization methodó optical microscopy and
/R spectroscopyí Results showed that the
organic mixture effectively inhibited the
corrosion of mild steel in both solutions with
an optimal inhibition efficiency of 7LíáR and
7LíáLR in )xSOá from weight loss and
potentiodynamic polarization testó while the
corresponding values in )õl were 7áíL4R
and 97íLHR respectivelyí Thermodynamic
calculations showed that the compound
chemisorbed onto the steel surface blocking
the diffusion of corrosive anionsí
Observations from microqanalytical images
confirmed the effective inhibition property of
the compound and its presence on the surface
topography of the steelí /nfrared spectra
revealed the presence of the functional groups
of the organic compound responsible for
corrosion inhibitioní The adsorption of the
compound was deduced to obey the
Langmuiró úrumkin and úreundlich adsorption
isothermí
Keywords
T Technology (General), TJ Mechanical engineering and machinery