As’ad Ustadi Pengarang

Effect of Salam Leaf Extract as Organic Inhibitor Against Corrosion Rate of ASTM A 36 Steel on Sea Water Dicky Adi Tyagita, ST., MT Main Advisor and Andik Irawan ST., M.Engas Supervisor As'ad Ustadi Study Program of Automotive Engineering Department of Engineering ABSTRACT Ballast tank on the hull was very susceptible to corrosion because they interact directly with corrosive sea water. Corrosion can be slowed by green inhibitors to coat the surface of the material so as to inhibit corrosion rate. Green inhibitors usedsalam leaf which contained phenolic compounds which are obtained by extracting salam leaf with maceration or extraction method without scanning. The purpose of this study was to determine the optimal immersion time for an inhibitor containing phenolic compounds of 166,967 μg against the corrosion rate of ASTM A 36 low carbon steel on the seawater of Ketapang Port. Using a variation in time for soaking, immersion 1, 2, 3, and 4 days by immersing the test material into the seawater of Ketapang Port for 30 days using the weight loss method. This research was supported by SEM (Scanning Electron Microscopy) to determine the material surface microstructure. The optimal immersion result of inhibiting corrosion rate is 3 days with the smallest corrosion rate value of 2070,35 mm / y and inhibitor efficiency of 89.92%. The results of microstructure images showed the thinner the crust of the corrosion product that attacks the material, the smaller the weight loss and if the corrosion is thicker, the weight loss will be greater.The immersion time of the inhibitor does not have a full effect to inhibit the corrosion rate because the inhibitor is absorbed by the corrosive liquid. Keywords:Ketapang port, Maceration, SEM, The Crust Of Corrosion.