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), pp. 138–146. doi: 10.23960/jemit.v3i4.114.