Ekstraksi Teh Hijau dan Aplikasinya sebagai Pengendali Korosi Pada Pompa di Lingkungan Garam NaCl 3,56%

Green tea leaves contain antioxidant compounds that can be used as organic inhibitors in a corrosion process. Tea were extracted by maceration method using 70% ethanol solution with solid:solvent ratio of 1:8 (w/v) for 1 x 24 hours an atmospheric room. The extract was then concentrated rotary evaporator and separated solvent under vacuum conditions at 852 mbar, temperature 70oC rotation 80 rpm. results the qualitative test extra 10% NaOH 1% FeCl3 changed color to brownish orange blue-black. This indicates content flavonoids tannins. leaf is also applied control rate brass metal. Variations concentration 200, 400, 600 ppm 3.56% NaCl solution. pump circulation carried out 40 hours, weight loss every 8 hours. average without inhibitor 3.95 mmpy, 200 1.24 400 0.46 0.23 mmpy. A significant decrease occurred efficiency 92.32%.