Inhibition of Copper Corrosion by Rice Straw Extract in 2M Solution of Nitric Acid

Abstract

In our research, the rice straw extract was utilized as an eco-friendly green inhibitor to prevent Cu dissolution in 2 M of HNO3. Mass loss, electrochemical tests, and surface checks were utilized to demonstrate the importance of this green extract to prevent the Cu corrosion procedure. From all tests, one can find that with increasing the dose of rice straw extract (up to 300 ppm), the protection efficacy increased to 96.8% at 25°C. Polarization curves showed that rice straw extract is a mixed-kind inhibitor that retards the anodic and cathodic reactions. From the EIS examination, the double-layer capacitance lowered by improving the dose of rice straw extract was noticed. On the other hand, the charge transfer resistance was improved. The corrosion protection (% I) of Cu occurs by the adsorption procedure, and this metal is followed by the Flory-Huggins and Langmuir adsorption isotherms. From both isotherms, the adsorption parameters were deduced. This test was also applied at different temperatures, and the activated parameters were determined and discussed. Results gotten from all used tests are in excellent harmony.