Synthesis of green corrosion inhibitor for mild steel in acidic environment

ABSTRACT The inhibitive potential of Mondia whittei roots extract (MWE) on corrosion of Mild Steel coupons in 0.5 M HCl solution was investigated by weight loss, depth of attack and surface analysis. Effect of various parameters, such as concentration of MWE, immersion time and temperature on inhibition efficiency was studied. The identification of the constituents of MWE and characteristics of the test solution and adsorbed film on the test coupon were evaluated by Gas Chromatography/Mass Spectrophotometer (GC-MS) and Fourier Transform Infra-Red (FTIR) Spectrophotometer. The surface morphology and topographical features of the corroded mild steels were done by the scanning electron microscope (SEM). The main constituents responsible for corrosion inhibition properties of MS were found to be guaiacol, vanillin, 9, 12-octadecadienoic acid and phenol, 2, 6-dimethoxyl among many other components which contain C, H and O. A maximum corrosion inhibition efficiency of 89.47% was obtained with 1.0 g/L in 0.5M HCl at 60°C after 9 h and volume – area ratio of 40 mL/cm2. Polarisation curves reveal that the inhibition efficiency according to depth of attack given by Ra and Rz increased with increasing inhibitor concentration, temperature, time and volume – area ratio.

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