Diana, N. , Ginting, E. and Karo, P.K. 2022. 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%. Journal of Energy, Material, and Instrumentation Technology. 3, 4 (Nov. 2022), 138–146. DOI:https://doi.org/10.23960/jemit.v3i4.114.