Browsing by Author "Irianty Rozanna Sri"

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    INHIBITOR KOROSI PADA AIR LAUT MENGGUNAKAN EKSTRAK TANIN DARI DAUN GAMBIR DENGAN PELARUT ETANOL-AIR
    (2013-01-28) Regina, Nikita; Irianty Rozanna Sri; A Yelmida
    Corrosion is a destructive process or decreases of metal quality because of the reaction with corrosive environment. One of the methods that able to decrease corrosion rate is by the addition of an inhibitors into corrosive media. Tannin is a component that can be extracted from natural material to be used as an inhibitor. Gambier leaves is one of natural materials which contains of tannin. The purpose of this research is to get the best concentration of inhibitor and inhibition efficiency from extracted gambier leaves by varying the contact time and pH of corrosive media in decreasing corrosion rate. This research was done by extracting tannin from gambier leaves with soxhletation method by using ethanol-water solvent with comparison 1:4 and then evaporated to get the condensed extract of gambir leaves. The research parameters is concentrations of inhibitor(1000, 3000, and 5000) ppm, contact time variation (5, 10, 15, 20) days, and pH (3,6,9) of sea water. Examination is conducted with gravimetric method to calculate weight loss of metal. The result of this research : the best concentration of inhibitor is 5000 ppm, contact time is 20 days and the lowest corrosion rate is 0,000507 gr/cm2 per day with inhibition efficiency is 60,345% and pH inhibitor variation from extracted gambier leaves is effective in decreasing corrosion rate at pH ±9 of sea water and contact time 20 days with the lowest corrosion rate are 0,000853 gr/cm² per day at concentration 1000 ppm, 0,000590 gr/cm².day at concentration 3000 ppm, and 0,000372 gr/cm².day at concentration 5000 ppm.
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    INHIBITOR KOROSI PADA AIR LAUT MENGGUNAKAN EKSTRAK TANIN DARI DAUN GAMBIR DENGAN PELARUT METANOL-AIR
    (2013-01-28) Ilandita, Rima; Irianty Rozanna Sri; A Yelmida
    Corrosion is a destructive process or degradation of metal quality because reaction with corrosive environment. Addition of inhibitors into corrosive media is one of the methods that able to decrease corrosion rate. Leaves of gambier is one of natural material which contains of tannin that able to be used as an inhibitor to protect metal from corrosion. The purpose of this research is to get the best concentration of inhibitor and inhibition efficiency of tannin extract from gambier leaves by varying the contact time and pH of corrosive media in decreasing corrosion rate. Tannin extract from leaves of gambier is obtained with soxhletation method by using methanol-water solvent with comparison 1:4 and then evaporated to get condensed extract of gambier leaves. Concentrations of tannin inhibitor that used are 1000, 3000, and 5000 ppm, with contact time variation are 5, 10, 15, 20 days, and variation pH of sea water as corrosive media are 3, 6, 9. Examination is conducted with gravimetry method to calculate weight loss of metal. The result of this research showed that lowest corrosion rate is 0,000547 gr/cm2.day at concentration of inhibitor 5000 ppm and contact time 20 days with average inhibition efficiency is 51,78%. At variation pH of sea water are obtained that lowest corrosion rate at pH of sea water ±9 is 0,000503 gr/cm2.day.