EVALUATION OF PHYSICAL, CHEMICAL PROPERTIES AND CHARACTERIZATION STUDIES OF ORGANIC INHIBITOR (AZADIRACHTA INDICA GUM) USING CONCRETE CORROSION

Abstract

The present research work mainly focused on the influence of natural admixtures using concrete with enhanced properties and to prevent the
corrosion using natural inhibitors. Corrosion of reinforcement is one of the drawbacks in reinforced concrete structure to overcome corrosion problem
an attempt has been made in the present investigation by use of corrosion inhibitors. The organic inhibitors extracted by water from Azadirachta
indica (Gum). In this study. the effect of Azadirachta indica gum as set retarding admixture in cement pastes. The various concentrations of 0.2 mg/L
to 1.6 mg/ L of the weight of cement and w/c ratio of 0.50. In the physical properties study, the inhibition efficiency was increased with increase in
the concentration of inhibitors for mild steel aqueous medium the maximum concentration (1.6 mg/L). The effect of aqueous extract of (Azadirachta
Indica Gum) on the corrosion inhibition of mild steel in various concentrations of 0.2 mg/L to 1.6 mg / L) solution was investigated by
electrochemical study and weight-loss experiments at temperatures ranging from 303 K. The percentage of inhibition increased with the increase of
the concentration of the inhibitor. At a concentration of 1.6 mg/ L, the percentage inhibition reached about 85.24% at 303 K. The SEM analysis
showed that inhibitors adsorbed on mild steel surface to protect mild steel from corrosion. The aqueous extract was found to be an excellent potential
corrosion inhibitor because of the high content of alkaloids. The results of inhibitors showed the natural gum has better corrosion inhibition
efficiency. It is also observed that the efficiency of inhibitors depends on the exposure environment