Brassica juncea Stem Extract as Corrosion Inhibitor for Mild Steel in 0.5 M Sulphuric Acid

Abstract

Corrosion inhibition behaviour on mild steel (MS) in 0.5 M H₂SO₄ by the Brassica juncea stem extract (BJSE) has been considered using weight loss method and electrochemical technique. Effect of inhibitors concentration and temperature (293-313 K) on inhibition efficiency during an immersion period of 6 h has been studied on mild steel. The optimum inhibition efficiency (IE) was obtained 90% at 293 K temperature with 1000 ppm extract concentration. The results of Polarization study indicated the stem extract as mixed type inhibitor. Langmuir adsorption isotherm showed physisorption of extract. The surface was examined using stemi 508 microscope.