Digital Library: No conditions. Results ordered -Date Deposited. 2024-03-28T18:12:48ZEPrintshttp://digilib.unila.ac.id/images/sitelogo.pnghttp://digilib.unila.ac.id/2015-11-23T06:00:18Z2015-11-23T06:00:18Zhttp://digilib.unila.ac.id/id/eprint/14774This item is in the repository with the URL: http://digilib.unila.ac.id/id/eprint/147742015-11-23T06:00:18ZEKSTRAKSI SENYAWA TANIN DARI DAUN KETAPANG
(Terminalia catappa L.) DAN UJI AKTIVITASNYA
SEBAGAI INHIBITOR KOROSIAbstrak
Pada penelitian ini telah dilakukan uji ekstrak tanin dari daun ketapang
(Terminalia catappa) sebagai inhibitor korosi pada baja lunak (mild steel) dalam
medium air laut buatan. Tahapan penelitian yang dilakukan meliputi
pengumpulan dan persiapan sampel, ekstraksi, uji fitokimia tanin dengan
menggunakan FeCl3 dan gelatin. Identifikasi tanin dilakukan menggunakan KLT
dan spektrofotometer FTIR serta spektrofotometer ultraungu-tampak. Uji korosi
dilakukan dengan dua cara, yaitu metode gravimetri dan metode potensiometri.
Analisis morfologi permukaan baja terkorosi dan komposisi baja lunak dilakukan
menggunakan SEM-EDS. Hasil penelitian menunjukkan bahwa berdasarkan uji
fitokimia, identifikasi dengan KLT dan data spektrum FTIR serta ultraungutampak, senyawa hasil ekstraksi tersebut merupakan tanin. Analisis laju korosi
dengan metode kehilangan berat menunjukkan bahwa inhibitor optimum pada
konsentrasi 40% v/v pada paparan 3 hari, cukup efektif dalam menghambat proses
korosi baja lunak dalam medium korosif dengan efisiensi inhibisi sebesar
60,87%, sedangkan analisis laju korosi dengan metode potensiometri
menunjukkan bahwa inhibitor optimum pada konsentrasi 40% v/v pada paparan 10
menit, efektif dalam menghambat proses korosi baja lunak dalam medium korosif
dengan efisiensi inhibisi sebesar 1,98%.
Kata kunci : tanin, terminalia catappa, inhibitor korosi
Abstract
In this study, the tannins extract from ketapang leaves (Terminalia catappa) had
been tested as a corrosion inhibitor of mild steel in synthetic brine solution with
carbon dioxide saturated at room temperature. Stages of the study were : sample
collection and preparation, extraction, phytochemical test of tannin using FeCl3
and gelatin. Tannins Identifications were performed using TLC, FTIR and
ultraviolet-visible spectrophotometer. Corrosion test were carried out in two
methodes, the gravimetric and potentiometric methods. Analysis of the surface
morphology of corroded steel and mild steel compositions performed using SEMEDS. The results showed that the test based phytochemicals test, identification by
using TLC, spectral data of FTIR and ultraviolet-visible, the extracted compound
is tannin. Analysis of the corrosion by weight loss method showed that the
optimum inhibitor concentration of 40% v/v in 3 days of exposure, is effective in
inhibiting the process of mild steel corrosion in corrosive medium with inhibition
efficiency of 60.87%, while the corrosion analysis with potentiometric method
showed that the optimum inhibitor concentration of 40% v/v at 10 minutes of
exposure, is also quite effective in inhibiting the corrosion of mild steel in the
corrosive medium with inhibition efficiency of1.98%.
Key words : tannin, terminalia catappa, corrosion inhibitorRetno Dwi Palupi 0817011010