Amrullah, Muhammad Fahrudin (2025) Pengaruh Variasi Konsentrasi Ekstrak Daun Kersen (Muntingia Calabura) Sebagai Inhibitor Organik Terhadap Korosifitas Baja API 5L Grade B Dengan Waktu Perendaman 3 Jam Dan 6 Jam Dalam Media HCl 1M. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Korosi merupakan permasalahan umum pada baja karbon dalam lingkungan agresif, khususnya larutan asam klorida (HCl). Penelitian ini mengevaluasi ekstrak daun kersen (Muntingia calabura) sebagai inhibitor organik untuk mengurangi laju korosi baja API 5L Grade B dalam media HCl 1 M. Karakterisasi ekstrak dilakukan menggunakan Fourier Transform Infrared Spectroscopy (FTIR) untuk mengidentifikasi gugus fungsi aktif yang berkontribusi terhadap proses inhibisi. Selanjutnya, efektivitas inhibitor diuji melalui metode Polarisasi Potensiodinamik, Electrochemical Impedance Spectroscopy (EIS), dan gravimetri (weight Loss), dengan variasi konsentrasi ekstrak sebesar 0 ml/L (kontrol), 0,3 ml/L, 0,4 ml/L, 0,5 ml/L, 0,6 ml/L, dan 0,7 ml/L serta waktu perendaman selama 3 jam dan 6 jam. Pengamatan morfologi permukaan baja setelah uji korosi dilakukan dengan teknik Scanning Electron Microscopy (SEM). Hasil penelitian menunjukkan bahwa ekstrak daun kersen merupakan inhibitor tipe campuran yang mampu menghambat reaksi korosi pada proses anodik maupun katodik. Pengujian polarisasi potensiodinamik menghasilkan efisiensi tertinggi sebesar 98% dengan konsentrasi 0,7 ml/L pada perendaman 6 jam diperoleh laju korosi 1,8925 mm/tahun. Pengujian EIS mencatat efisiensi optimal 97% pada konsentrasi yang sama dengan waktu perendaman 3 jam dengan nilai hambatan polarisasi (Rp) mencapai 147,52 ohm, sedangkan efisiensi tertinggi metode gravimetri sebesar 85% pada konsentrasi 0,7 ml/L selama 6 jam perendaman dengan laju korosi 1,7402 mm/tahun. Dengan demikian, ekstrak daun kersen terbukti efektif sebagai inhibitor korosi organik yang ramah lingkungan, berpotensi diterapkan secara luas dalam pengendalian korosi pada baja di lingkungan asam.
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Corrosion is a common problem for carbon steel in aggressive environments, especially hydrochloric acid (HCl) solution. This study evaluates kersen (Muntingia calabura) leaf extract as an organic inhibitor to reduce the corrosion rate of API 5L Grade B steel in 1 M HCl media. Characterization of the extract was conducted using Fourier Transform Infrared Spectroscopy (FTIR) to identify active functional groups that contribute to the inhibition process. Furthermore, the effectiveness of the inhibitor was tested through Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy (EIS), and gravimetric (weight Loss) methods, with variations in extract concentrations of 0 ml/L (control), 0.3 ml/L, 0.4 ml/L, 0.5 ml/L, 0.6 ml/L, and 0.7 ml/L and immersion times of 3 hours and 6 hours. Observation of steel surface morphology after corrosion test was carried out by Scanning Electron Microscopy (SEM) technique. The results showed that kersen leaf extract is a mixed type inhibitor capable of inhibiting corrosion reactions in both anodic and cathodic processes. Potentiodynamic polarization testing resulted in the highest efficiency of 98% with a concentration of 0.7 ml/L at 6 hours of immersion with a corrosion rate of 1.8925 mm/year. EIS testing recorded an optimal efficiency of 97% at the same concentration with a 3 hours immersion time with a polarization resistance (Rp) value of 147.52 ohms, while the highest efficiency of the gravimetric method was 85% at a concentration of 0.7 ml/L for 6 hours of immersion with a corrosion rate of 1.7402 mm/year. As a result, kersen leaf extract proved to be effective as an environmentally friendly organic corrosion inhibitor, potentially widely applied in corrosion control of steel in acidic environments.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Baja API 5L, Daun Kersen, HCl, Inhibitor Organik, Korosi, Corrosion, HCl, Kersen Leaf, Organic Inhibitor, API 5L Grade B Steel. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA462 Metal Corrosion and protection against corrosion T Technology > TA Engineering (General). Civil engineering (General) > TA467 Iron and Steel Corrosion and protection against corrosion |
| Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | MUHAMMAD FAHRUDIN AMRULLAH |
| Date Deposited: | 28 Jul 2025 06:56 |
| Last Modified: | 28 Jul 2025 06:56 |
| URI: | http://repository.its.ac.id/id/eprint/122377 |
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