Inhibitory action of aqueous garlic peel extract on the corrosion of carbon steel in HCl solution

摘要

The effect of aqueous garlic peel extract on the corrosion process of carbon steel in 1 mol L~(-1) HCl was examined. The inhibition efficiency of C-steel in 1 mol L~(-1) HC1 increased as the extract concentration and temperature increased. The inhibitory property of the extract is discussed in terms of the mechanism by which its components adsorb onto the C-steel surface. This adsorption process obeyed a Langmuir adsorption isotherm. HS-SPME GC analysis of the garlic peel extract suggests that sulphur compounds may play an important role in the inhibition process.