Green Corrosion Inhibitor for Carbon Steel by Marrubium astranicum Leaves Extracts in 1 M HCl

The aim of this study was to investigate the effect of inhibition of Marrubium astranicumleaves extract on the corrosion of carbon steel in hydrochloric acid solution by using weightloss and tafel polarization methods. Inhibition was found to increase with increasingconcentration of the leaves extract. The inhibition efficiency of this extract at an optimumconcentration of 100 mg L-1 was 99.9 %. The effect of inhibitor concentration, immersiontime and temperature on the corrosion behavior of carbon steel in 1 M HCl was also studied.The inhibition was assumed to occur via adsorption of the inhibitor molecules on the metalsurface. The adsorption of the extract on the carbon steel surface obeys the Langmuiradsorption isotherm. The results obtained show that the leave extract of plant could serve asan effective green inhibitor of the corrosion of carbon steel in hydrochloric acid.