Diana N, Ginting E, Karo PK. The Effect of Cacao Leaf Extract as An Inhibitor with A Concentration Variation of 0%, 3%, 5%, And 7% on The Corrosion Rate of St 37 Steel with Immersion Time of 3 Days And 6 Days in NaCl Corrosive Medium 3%. J. Energy Mater. Instrum. Technol. [Internet]. 2022Nov.30 [cited 2025Nov.26];3(4):138-46. Available from: http://jemit.fmipa.unila.ac.id/index.php/jurnal/article/view/114