COMBATING CORROSION OF MILD STEEL IN HYDROGEN TETRAOXOSULPHATE (VI) ACID ENVIRONMENT USING GREEN ...

The corrosion inhibition effectiveness of ethanol extracts of Chysophyllum albidum leaves (EECAL) and stem (EECAS) on mild steel corrosion in 0.5 M H2SO4 solution was tested and compared at 303 K and increased temperatures 303 and 323 K. The weight loss method (gravimetric) and hydrogen evolution (gasometric) approaches were used in the experiments, respectively. The findings show that both plant extracts reduce mild steel corrosion in the medium. At 4.0 g/L, however, EECAS had a greater maximum inhibition efficiency (90.7%) than EECAS (80.3%). In general, inhibitory efficiency increased as the content of both plant extracts increased, but reduced as the temperature rose. The Langmuir adsorption isotherm was discovered to govern the adsorption of both extracts on the mild steel coupon. The phenomena of physical adsorption is proposed based on the acquired thermodynamic parameters, which reveal that the equilibrium constant (Kad) decreases with increasing temperature and that the free energy of adsorption (-Goad) values are more negative than 40 kJ/mol.

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