GREEN SYNTHESIS OF MILD STEEL CORROSION INHIBITOR IN A SALT SOLUTION MADE FROM PEPPER FRUIT (PIPER NIGRUM LINN), ARECA FRUIT (ARECA CATHECU LINN) AND TEA LEAVES (CAMMELLIA SINENSIS L. KUNTZE)SISWANTO AND DJONY IZAK RUDYARDJOAbstract This study aims to synthesize a corrosion inhibitor based on natural materials. The synthesis material of this research consists of extracts of three types of plants which are widely found in the Indonesian environment, namely pepper, areca nut and tea leaves. The extraction of these three basic ingredients is carried out using the maeseration method. The extract is used as an inhibitor in mild steel. The functional groups extracted were observed using FTIR (Fourier Transform Infra Red), while the microscopic structure of the steel surface given the inhibitor was observed using a metallurgical microscope. The measurement of the corrosion rate was carried out using the mass loss method in 1M NaCl medium. The experimental results showed that the betel nut extract was more efficient as an inhibitor than the tea leaf and pepper extract. The betel nut extract can maximally reduce corrosion with an efficiency of 85.5% and a corrosion rate of 1.65 mpy. However, in general, the corrosion rate of steel decreased as the inhibitor increased, using either betel nut extract, tea leaves or pepper fruit. |