The effect of Culcasia scandens leaf extract on the corrosion
of mild steel in 2 M HNO3 solution was studied using weight loss or gravimetric
technique at 303K, 323K and 343K for 30 minutes.
The Culcasia scandens leaf extract inhibited the corrosion of
mild steel in 2 M HNO3 solution. The inhibition efficiency increased with
the concentration of the extract and temperature rise. The inhibition is attributed
to the adsorption of the extract on the surface of the mild steel coupon.
The corrosion rate, degree of surface coverage θ increased
with increase in the inhibitor concentration and temperature. The increase in
the degree of surface coverage with rise in temperature suggests that strong
chemical bond exist between the extracts and the adsorbent.
