Extraction of Tannin Compounds from Samanea saman (Jacq.) Merr Leaves and Their Application as Corrosion Inhibitor in ST 37 Steel S. Kasim, S. Fauziah, R. Ananda, I. W. Sutapa, A. Kamari International Journal of Acta Material Vol. 1 No. 1 2024 DOI 10.62749/ijactmat.v1i1.3