Sargassum latifolium Extract as a Safe Corrosion Inhibitor for Aluminum in 1 M Hydrochloric Acid Medium: Surface Analysis and Biological Effect

Sargassum latifolium extract was used as new extract for the protection of Al dissolution using chemical and electrochemical methods. It was extracted, tested, and its high inhibition quality with addition of 1 × 10^–2 M KI at 298 K for 300 ppm in 1M hydrochloric acid was recorded. The adsorption mechanism agreed with the Temkin isotherm from the weight loss procedure. From Tafel extrapolations showed that the used extract acts as mixed inhibitor. The thermodynamic parameters were organized and clarified. The attenuated total reflectance-Fourier transform infrared spectroscopy and atomic forced microscopy were performed for the Al surface analyses and a good decrease in the surface roughness was reached. The used extract has also demonstrated a satisfying biological activity against bacterial growth.