Inhibition effect of Phenylamine on the Corrosion of Austenitic Stainless Steel (Type 304) in dilute sulphuric acid
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The corrosion of austenitic stainless steel (type 304) in dilute sulphuric acid solutions in
addition to recrystalized sodium chloride concentrates in the presence of specific proportions of
phenylamine was studied with the aid of polarization resistance technique, electrode potential
monitoring and coupon method. Results showed the overwhelming influence of the compound in
corrosion inhibition with an inhibition efficiency of 97.5% from coupon analysis and 86.10% from
polarization test at highest observed concentration of the inhibitor. Corrosion potential measurement
showed potentials well with passivation values. Corrosion rate decreased progressively with increase
in concentration of phenylamine. Adsorption of the compound on the steel surface followed the
Langmuir isotherm model. Thermodynamic calculations showed the interaction mode with the steel
to be physiochemical. Observation from scanning electron microscopy and x-ray diffractometry
showed the electrochemical impact on the surface topography and the phase compounds of the steel
samples studied. Results from statistical analysis depict the sharp influence of inhibitor
concentration on the electrochemical performance of the compound.
Keywords
T Technology (General), TJ Mechanical engineering and machinery