Green Corrosion Inhibitor for Protection of Mild Steel


In the present work, corrosion inhibition of Mild steel in 1M H2SO4 solution by Rosmarinus Officinalis Leaves extract was studied by weight loss and potentiostatic methods. Increasing acid concentration leads to an increase in the corrosion rate of the electrode. The variable conditions used in this investigation are (100 to 1000 ppm at 25oC. Rosmarinus Officinalis Leaves extract for Mild steel. It has been found that the concentrates as a compelling consumption inhibitor for gentle steel in acidic medium. The hindrance process is credited to the development of an adsorbed film of inhibitor on the metal surface, which secures the metal against corrosion. The inhibition efficiency was observed that increase with increasing inhibitor concentration up to maximum 92% for 1000 ppm at 25 oC. The results show that the corrosion rate without inhibitor is 5.6 mpy while with inhibitor be 0.43 mpy, that is mean the corrosion rate was improved more than 90%. The effects of immersion time (2 h) at 25oC on the inhibition of corrosion have also been improved corrosion resistance. The results obtained show that Rosmarinus Officinalis Leaves Extract could serve as an excellent friendly green corrosion inhibitor. FTIR results indicate that this herb containing different chemical bonds (C-C, CH2, C-O-C, Cellulose) with steel surface producing barrier layer to protect the surface