EFFECT OF INHIBITION OF STERCULIA FOETIDA LEAVES ON MILD STEEL IN HYDROCHLORIC ACID

The effect of inhibition on mild steel in an aggressive medium could be studied using sterculia foetida leaves (SFL) which were used as a green inhibitor. The inhibiting effect was analyzed by mass loss method with various times of immersion at different temperatures. By increasing the concentration of the plant extract as well the immersion time the inhibition efficiency increases. The corrosion inhibitive nature of the (SFL) extract was confirmed from the increasing charge transfer resistance value in the electrochemical impedance spectroscopy. In the potentiodynamic polarization technique, both the cathodic and anodic reactions were controlled. The protective film formed on the surface of the metal acted as a barrier against corrosion which was proved from scanning electron microscopic analysis.