Study of Black Pepper Effect as Natural Corrosion Inhibitors for Copper in Acidic Solution

In this study, the influence of black pepper on the corrosion behavior of copper samples in sulfuric acid has been investigated. The corrosion test and morphology study were carried out by potentiodynamic polarization and Scanning Electron Microscopy (SEM) respectively. Fourier Transform Infrared (FTIR) technique was used for determination function groups in black pepper. The black pepper, as inhibitor, decreased corrosion rate of Cu in acidic media by affected cathodic and anodic polarization curves. The present of black pepper has shown more effect on the cathodic polarization curve. The results showed that Inhibition Efficiency (IE) increased when the black pepper concentration increased and become highest IE=86% at 548 mg/L. the SEM image confirmed that the black pepper as natural inhibitor prevented localized corrosion of copper.