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Investigation of the corrosion inhibition properties of benzonitrile compound on the surface degradation of quenched 420 martensitic steel in 6 M H2SO4 was evaluated through the application of potentiodynamic polarization method, micro analytical study and ATR-FTIR spectroscopic analysis. Experimental data showed optimal inhibition performance of the compound at peak inhibition efficiency of 99.4% with mixed type inhibition but dominant anodic inhibition properties. The inhibiting compound significantly influenced the thermodynamic behaviour of the steel resulting in chemisorption adsorption mechanism onto steel surface in consonance with Langmuir and Freundlich adsorption isotherm models with correlation coefficients of 1 and 0.7570. The transmittance of identified functional groups of benzonitrile from ATR-FTIR spectroscopy decreased at extended wavelengths due to surface coverage and adsorption of the compound onto the steel.

Electrochemical Analysis of the Anti-corrosion Properties of Benzonitrile Compound on Quenched 420 Martensitic Steel in Strong Aqueous Environment