Nanosilicate Extraction from Rice Husk Ash as Green Corrosion Inhibitor

Silica was extracted from rice husk ash (RHA) and used to produce corrosion inhibitor for carbon steel. The particle size of the extracted silica was in the range 10-20 nm as measured using transmission electron microscopy (TEM). The corrosion inhibition efficiency of nanosilicate attained 99% as measured using the potentiodynamic polarization and weight loss measurements after 6 hrs exposures. It was found that the nanosilicate act excellently as corrosion inhibitor for carbon steel in distilled water medium. The surface morphology of carbon steel with and without inhibitor was investigated by SEM-EDX.