Efek Sinergetik Ekstrak Daun Jambu Bol (Syzygium malaccense) dan Iodida terhadap Korosi Baja dalam Larutan Asam

Abstract

Research on the synergistic effect of jambu bol leaves extract and iodide on the corrosion of mild steel in acid solution has been carried out by weight loss, potentiodynamic polarization measurements, Fourier transform infrared (FTIR), scanning electron microscopy (SEM) analysis, and X-Ray Diffraction (XRD) characterization. The inhibition efficiency increased with increasing iodide concentration and temperature. The highest inhibition efficiency was 92.05% in inhibitor of 5 g / L jambu bol leaves extract with the addition of 0.08 g / L of iodide. Adsorption of jambu bol leaves extract and iodide following the Langmuir isotherm adsorption. Potentiodynamic polarization measurements show the combination of jambu bol leaves inhibitor and iodide was a type of mixture inhibitor in hydrochloric acid solution. The synergistic effect of guava bol extract and potassium iodide was studied using thermodynamic and kinetic parameters.
 
 Keywords: Jambu bol leaves, corrosion inhibitor, weight loss, synergistic effect, Langmuir isotherm

Synergetic Effect of Potassium Iodide and Miana (Coleus scutellaroides (L.) Benth.) Leaves Extract on Mild Steel in HCl Medium

“…Where C is the inhibitor concentration (g/L), θ is the degree of surface coverage, and Kads is the adsorption equilibrium constant. This proves that in 1 M HCl, MLE and potassium iodide follows the Langmuir adsorption isotherm (Untari et al, 2020).…”

“…The surface of the mild steel is smoothed using iron sandpaper, then rinsed with deionized water and acetone. The cleaned mild steel is dried using an oven and weighed, with the recorded weight being the initial weight (W1) (Untari et al, 2020).…”

“…The mild steel is then cleaned, rinsed, and dried. After completing these steps, the mild steel is weighed, and the ultimate weight (W2) is indicated by the recorded weight (Untari et al, 2020).…”

“…After immersion, the mild steel is dried, and the layer adhering to the mild steel surface is obtained by scraping off this layer. Subsequently, Fourier Transform Infrared (FTIR) measurements are performed (Untari et al, 2020).…”

“…The SEM analysis allows for the examination of surface topography, the identification of corrosion products, and the assessment of the effectiveness of the MLE in mitigating corrosion. This detailed examination provides valuable insights into the structural changes and corrosion mechanisms occurring at the surface of the mild steel under different experimental conditions (Untari et al, 2020).…”