Use of Lawsonia Inermis and Sodium Nitrite as Surface Applied Corrosion Inhibitors

This research provides an investigation to measure the rate of corrosion steel bars coated with organic inhibitor Lawsonia inermis (Henna) and inorganic Sodium Nitrite (NaNO2) embedded in concrete. Presence on reinforcement reduces bond strength between concrete over a while excessive bar can lead loss ductility, extreme cases collapse. Structures like marine structures, sewage pipes, which are prone damage due presence salts, acidic environment, is accelerated when compared normal therefore there need protecting such type structures. In previous researches, inhibitors were added directly into mix preparing inhibition efficiency was analysed. However, this case, applied reinforcing itself as occurs has proven be effective. present study, Henna paste inhibitors. Inhibitors form 2 layers, 4 layers combination used. The beams specimens cured for 58 days saline environment. difference potential measured by half-cell potentiometer. Results suggested that specimen coating had reduced 46% original sample. Also, coats sodium nitrite showed better efficiency.