Inhibition of Steel-Rebar Corrosion in Industrial/Microbial Simulating-Environment by Morinda lucida

Abstract

This paper studies inhibition of steel-rebar corrosion in concrete immersed in 0.5 M H2SO4, simulating industrial/microbial environment by the leaf extract ofMorinda lucida. Electrochemical monitoring methods were employed for testing different concentrations of the leaf extract admixed in duplicated specimens of steel-reinforced concrete slabs immersed in the acidic test-system. Statistical analyses as per ASTM G16-95 R04 of the experimental results showed that effectiveness ofMorinda lucidaat inhibiting concrete steel-rebar corrosion increased with the concentration of the admixture. 0.4167%Morinda lucida, per weight of cement, was identified with optimum inhibition efficiencyη= 98.78±0.34% followed in effectiveness by 0.3333%Morinda lucidawithη= 93.20±1.76% at inhibiting steel-rebar corrosion in the corrosive test-environment.