The experimentally Studying of the
corrosion of mild steel metal using methanonic root bark
extract of Anthocleista djalonensis plant, in hash 1molar
solution of hydrochloric acid by gravimetric method
shows the folowing results. The result gotten shows, that
the s concentration of Anthocleista djalonensis plant
extract even in acidic media, inhibitsmild steel’s
corrosion rate.Furthermore, the Inhibitive efficiency of
this sampled plant was found to defer with
concentration, temperature and time
ofimmersion.Thermodynamic studies reveals that
adsorption of the metal coupon is spontaneous in
accordance with Langmuir’s adsorption isotherm.
Synergistic consideration which is the presence of
potassium iodide (KI) was carried out indicating an
increase in the corrosion inhibition of Anthocleista
djalonensis extract. There was a physical adsorption
model of theory that was proposed as inhibition
efficiency tarries with temperature change,
concentration and other parameters as well.
Keywords : Spontaneous reactions, Gibbs free energy, iron oxide, biodegradable, inhibitor efficiency.