In aqueous solution of 0.5M H2SO4, the Annona Squamosa extract was systematically analyzed to
ensure its inhibition mechanism by using potentiodynamics polarization, the weight loss method, and
electrochemical impedance spectroscopy (EIS) and its inhibitory effect on mild steel corrosion. For
mild steel corrosion in 0.5 M H2SO4 solution, its inhibition efficiency increases and decreases with an
increase in its concentration and temperature, respectively. Potentiodynamic polarization analyses
revealed that the Annona Squamosa behaves as a cathodic inhibitor. In presence of Annona Squamosa
extract in 0.5 M H2SO4 solution, an increase in the activation energy of corrosion leads to a decrease
in the rate of mild steel corrosion. On mild steel surfaces, the adsorption behaviour of the extract
conformed to the Temkin isotherm, Langmuir isotherm and Arrhenius equation. The EIS results were
correlated with the polarization findings. According to atomic force microscopy (AFM) and scanning
electron microscopy (SEM), the inhibition of mild steel corrosion proceeds through the adsorption of
the extract on the mild steel surface.
Bis-Schiff bases of 2,2′-dibromobenzidine as efficient corrosion inhibitors for mild steel in acidic medium
