Corrosion Inhibition by Natural Extracts at 50oC

This work involves investigation on corrosion inhibition of steel 37-2 using Cinnamon, Ficus carica and Sweet clover extracts as natural inhibitors at 50oC by electrochemical measurements and AFM test. The data of polarization in blank electrolyte containing 3mL/L of each extract in electrolyte gave inhibition efficiencies equal to 86.051, 74.025 and 83.935% in presence 3mL/L of Cinnamon, Ficus carica and Sweet clover extract respectively. The data of AFM test shows the decreasing in roughness of surface after adding the natural inhibitor which equal to 0.631, 4.13 and 1.1nm corresponding to 3mL/L of Cinnamon, Ficus carica and Sweet clover extract respectively compared with the roughness Ra of polished and uninhibited surface as 8.39 and 44.7 nm respectively.