Syafriadi, Syafriadi, Risca Adriana, and Agus Riyanto. “Effect of Concentration Variation of Cacao Leaf Extract (Theobroma cacao.) Inhibitor on the Corrosion Rate of ST 37 Steel in 3% HCl Solution”. Journal of Energy, Material, and Instrumentation Technology 4, no. 1 (February 28, 2023): 1–9. Accessed October 13, 2026. https://jemit.fmipa.unila.ac.id.103-3-46-85.cpanel.site/index.php/jurnal/article/view/35.