UJI AKTIVITAS EKSTRAK DAUN ASAM KERANJI (Dialium indum) SEBAGAI INHIBITOR KOROSI BAJA LUNAK DALAM MEDIUM YANG MENGANDUNG KARBON DIOKSIDA (CO2)
| Main Author: | ANNISA NURDIANTI , 1517011016 |
|---|---|
| Format: | Bachelors NonPeerReviewed Book Report |
| Terbitan: |
FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM
, 2020
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| Subjects: | |
| Online Access: |
http://digilib.unila.ac.id/62051/1/ABSTRAK.pdf http://digilib.unila.ac.id/62051/2/SKRIPSI%20FULL.pdf http://digilib.unila.ac.id/62051/3/SKRIPSI%20TANPA%20BAB%20PEMBAHASAN.pdf http://digilib.unila.ac.id/62051/ |
Daftar Isi:
- Pada penelitian ini telah dilakukan uji aktivitas daun asam keranji (Dialium indum) sebagai inhibitor korosi baja lunak dalam medium korosif yang mengandung karbon dioksida (CO2). Daun asam keranji diekstraksi secara maserasi menggunakan metanol selama 5 x 24 jam. Hasil ekstraksi dikarakterisasi dengan uji fitokimia, Kromatografi Lapis Tipis (KLT), dan spektrofotometri Fourier Transformed Infrared (FTIR). Terhadap ekstrak daun asam keranji dilakukan uji inhibisi korosi baja lunak dalam medium korosif mengandung CO2 dengan metode wheel test dan elektrokimia yaitu Electrochemical Impedance Spectroscopy (EIS) dan Tafel. Analisis permukaan baja lunak menggunakan Scanning Electron Microscopy (SEM). Hasil karakterisasi uji fitokimia, KLT, dan FTIR menunjukkan ekstrak daun asam keranji mengandung senyawa flavonoid, fenol, dan tanin. Hasil pengukuran metode wheel test menunjukkan bahwa ekstrak daun asam keranji dapat berfungsi sebagai inhibitor korosi dengan efektif menurunkan laju korosi baja sebesar 0,492 mmth-1 dengan persen proteksi tertinggi 64,53% pada konsentrasi 100 ppm dan suhu 50 oC. Hasil EIS menunjukkan semakin bertambah konsentrasi inhibitor ekstrak daun asam keranji disebabkan oleh tahanan transfer muatan (Rct) atau persen proteksi semakin baik, ditunjukkan pada konsentrasi 150 ppm dengan nilai Rct 112,11 Ohm.cm2 dan persen proteksi sebesar 91,78% pada suhu 50 oC . Hasil pengukuran Tafel dengan nilai arus korosi (Icorr) 8,199 μA.cm2 diperoleh nilai laju korosi sebesar 0,083 mmth-1 setara dengan persen proteksi sebesar 95,76% yang menunjukkan bahwa konsentrasi 150 ppm sangat baik dalam mengurangi nilai laju korosi. Analisis permukaan dilakukan dengan analisis SEM dimana permukaan baja lebih halus pada penambahan inhibitor korosi pada konsentrasi 150 ppm dibandingkan dengan permukaan baja tanpa penambahan inhibitor. Kata kunci : baja lunak, korosi, inhibitor korosi, asam keranji, karbon dioksida (CO2). In this research, the activity of keranji acid leaves (Dialium indum) have been conducted as a mild steel corrosion inhibitor in a corrosive medium containing carbon dioxide (CO2). Keranji acid leaf was extracted with maceration method using methanol for 5 x 24 hours. The extraction results were characterised by phytochemical test, thin-layer chromatography (TLC), and the forier transformed infrared (FTIR) spectrophotometry. The inhibition corrosion test were done of keranji acid leaft extract at mild steel in corrosion medium contained CO2 test through wheel test and electrochemical method that is electrochemical impedance spectroscopy (EIS) and Tafel. Therefore, analysis of mild steel surface was done using scanning electron microscopy (SEM). The characterisation of phytochemical tests, TLC, and FTIR showed that the keranji acid leaf extract contain flavonoid, phenols, and tannins. The measurement result of the wheel test method showed that the keranji acid leaf extract could serve as a corrosion inhibitor by effectively lowering the steel corrosion rate by 0,492 mmth-1 with the highest percent protection of 64,53% at 100 ppm concentration and temperature 50oC. The EIS result showed that the increasing concentration of keranji acid leaf extract inhibitors, due to the increasing of load resistance (Rct) percent protection was getting better, it can be seen at a concentration of 150 ppm with an Rct‟s value of 112,11 Ohm.cm2 and percent protection 91,78% at a temperature of 50oC. The result of the measurement Tafel with corrosion current value (Icorr) 8,199 μA.cm2 obtained the value of corrosion rate of 0,083 mmth-1 equivalent to percent protection by 95,76% which indicated that the concentration of 150 ppm is highly in reducing the value of corrosion rate. surface analysis was done by SEM analysis where the steel surface was more refined in addition of corrosion inhibitors at concentrations of 150 ppm compared with the steel surface without the addition of inhibitors. Keywords: mild steel, corrosion, corrosion inhibitors, keranji acid, carbon dioxide (CO2)