Temperature effects on the corrosion inhibition of carbon steel in 1M HCl solution by methanolic extract of Euphorbia Falcata.L

Gravimetric method was used to study the temperature effects on carbon steel corrosion in molar HCl solution, in the absence and presence of methanolic extract of Euphorbia Falcata.L (MEEF). The results revealed that the inhibition efficiency of MEEF increased with the inhibitor concentration. The highest inhibiting efficiency reached 96% at 323 K at 3g/L. The adsorption was spontaneous and followed Langmuir adsorption isotherm at all studied temperatures. Thermodynamic data for inhibitor adsorption and carbon steel corrosion lead to suggest the manner of the adsorption of MEEF.