Investigation of the Inhibitory Effect of Sucrose on Corrosion of Iron (Libyan Steel) in Mineral Acid Solutions

Abstract

Corrosion inhibitory effect of sucrose (C₁₂H₂₂O₁₁) at different concentrations (0.1-10000 ppm) on corrosion of iron (Libyan steel) in various mineral acid solutions viz., HCl, HNO₃ and H₂SO₄ of different concentrations (0.01-1.50 M) was investigated by weight loss measurements at 25 ºC temperature and different exposure time, up to 24 h. It was observed that the corrosion rate depends on concentration and exposure time. The corrosion rate decreases by increasing concentration of the inhibitor. It attains the lowest value at 10,000 ppm, which, is almost constant in this region. The corrosion rate also depends on the nature of mineral acid and its concentration. Sulphuric acid shows the highest rate of corrosion. The rate of corrosion changes with a change in the concen-tration of sucrose. The corrosion inhibition percentage is ca. 10 % at sucrose concentration of 0.1 ppm, whereas this percentage is almost 8 times higher (80 %) for sucrose concentration of (10,000 ppm).