High Temperature Effectiveness of Ginger Extract as Green Inhibitor for Corrosion in Mild Steel
Corrosion is one of the major problems in using Mild steels in acidic medium. Corrosion inhibitors are used to decrease the rate of corrosion but most of these inhibitors are toxic in nature and a hazard to environment, therefore corrosion inhibitors from green sources are more desirable and can be a substitute to conventional toxic inhibitors. In the present study Ginger is selected as corrosion inhibitor due to its simple extraction method, nontoxic nature, low cost and presence of effective organic compounds. Ginger extract is made first and then different concentration of 250, 500, 750 and 1000 ppm used in 0.1 M HCl solution to study the effect on corrosion rate at room temperature and at an elevated temperature of 50ᵒC. Electrochemical Linear polarization resistance (LPR) tests is carried out to determine the corrosion rates at room temperature and 50ᵒC for different concentrations of inhibitor and then the results are compared. It is found that in all cases corrosion rate is higher when corrosion inhibitors are not used. Addition of corrosion inhibitors decreases the corrosion rate even when a small quantity of 250 ppm is used. The corrosion rate become constant at room temperature after addition of 250 ppm of inhibitor while for high temperature the decrease in corrosion rate is more prominent and it keep on decreasing when the concentration of inhibitor is increased.
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