The inhibitor potentials of discrete plant extract was exploration by studying the corrosion
behaviour of mild steel immersed in 2 M H2SO4 solution containing varied concentration of plant
extract. Inhibitor efficiency of acid extract of plant such as musa sapientium peel , Emblica officinalis
leaves and Azadirachta indica leaves as corrosion inhibitor for mild steel. The corrosion inhibition of the
extract was criticized by using weight loss method , gasometric method , thermometric method and
surface analysis studies . The inhibitor efficiency increased with increase in inhibitor concentration and
decreased with temperature suggesting the occurrence of physical absorption and the highest % IE was
obtained. As a result of literary work about performance was reviewed to identify the factor affecting the
performance of corrosion inhibitor. Inhibitor efficiency of the extract is found to vary with concentration
, temperature , period of immersion and pH.Value of active energy of the inhibited corrosion reaction of
mild steel are greater than the value obtained for the blank solution.The mild steel surface in the absence
and presence of the inhibitor was analysed by scanning electron microscopy(SEM) and the protective
film have been analysed by Atomic force microscopic (AFM).