RADITYAN, FATWA TRESNA (2026) PENGEMBANGAN INHIBITOR KOROSI BERBASIS TANIN DARI EKSTRAK KULIT JAGUNG SEBAGAI SOLUSI PROTEKSI RANGKA SEPEDA MOTOR. S2 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Corrosion of motorcycle metal components is a serious issue that reduces both service life and vehicle performance. The use of synthetic corrosion inhibitors has become a common solution, but it poses harmful environmental impacts. Therefore, eco-friendly and sustainable alternatives are required. This study proposes the utilization of corn husk extract, an agricultural waste rich in active compounds such as tannins and phenols, as a natural corrosion inhibitor. The effectiveness of corn husk extract in mitigating corrosion on carbon steel used for motorcycle frames was analyzed. The inhibitor’s performance was tested on frame material with a base composition of Fe 82.84% and Mn 1.75%, confirmed by SEM EDX, in a corrosive medium of 3% NaCl solution with varying coating layers: uncoated (control), one layer, two layers, and three layers. Cross section characterization revealed highly stable and linear growth of protective film thickness, with a constant increment of 0.6 µm per layer, reaching a maximum thickness of 2.4 µm at three layers without macro-defects. Corrosion rate testing was conducted using the potentiodynamic Tafel polarization method and validated with manual calculations. Results showed that the uncoated control sample exhibited the highest corrosion rate of 0.27001 mmpy with a current density (Icorr) of 2.3169 × 10⁻⁵ A/cm². As the number of layers increased, the corrosion rate decreased linearly. The optimal protective performance was achieved with three layers, reducing the corrosion rate to a minimum of 0.03529 mmpy (Icorr 3.0283 × 10⁻⁶ A/cm²) and yielding the highest inhibitor efficiency (IE%) of 86.93%. Polarization curves confirmed that the inhibitor gel acts effectively as a mixed type barrier, simultaneously blocking mass and charge transfer in both anodic and cathodic reactions. The error rate between instrument testing and manual calculation was very low (0.26%–0.27%), validating data accuracy. This study demonstrates that corn husk tannin gel formulation holds significant potential for practical application in the automotive industry as a safe, economical, and sustainable chassis protection technology. Keywords: Corrosion, Inhibitor, Corn Husk Extract, Frame Korosi pada komponen logam sepeda motor merupakan masalah serius yang dapat menurunkan umur pakai dan kinerja kendaraan. Penggunaan inhibitor korosi sintetis telah menjadi solusi umum, namun menimbulkan dampak lingkungan yang merugikan. Oleh karena itu, diperlukan alternatif inhibitor korosi yang ramah lingkungan dan berkelanjutan. Penelitian ini mengusulkan pemanfaatan ekstrak kulit jagung, limbah pertanian yang kaya akan senyawa aktif seperti tanin dan fenol, sebagai inhibitor korosi alami dengan menganalisis efektivitas ekstrak kulit jagung dalam menghambat korosi pada baja karbon yang digunakan sebagai material rangka sepeda motor. Efektivitas inhibitor diuji pada material rangka komposisi dasar Fe 82,84% dan Mn 1,75% terkonfirmasi SEM-EDX dalam media korosif larutan NaCl 3% dengan variasi jumlah pelapisan: tanpa lapisan (kontrol), 1 lapisan, 2 lapisan, dan 3 lapisan. Karakterisasi cross-section menunjukkan pertumbuhan ketebalan film pelindung yang sangat stabil dan linier dengan interval kenaikan konstan 0,6 µm untuk setiap penambahan lapisan, mencapai ketebalan tertinggi sebesar 2,4 µm pada variasi 3 lapisan tanpa cacat makro. Pengujian laju korosi dilakukan menggunakan metode elektrokimia potensiodinamik polarisasi Tafel dan divalidasi dengan perhitungan manual. Hasil penelitian menunjukkan bahwa sampel kontrol tanpa lapisan memiliki laju korosi tertinggi sebesar 0,27001 mmpy dengan kerapatan arus (Icorr) 2,3169 x 10⁻⁵ A/cm². Seiring bertambahnya jumlah lapisan, laju korosi menurun secara linier. Performa proteksi paling optimal dicapai oleh konfigurasi 3 lapisan yang berhasil menekan laju korosi hingga menyentuh titik minimum sebesar 0,03529 mmpy (Icorr 3,0283 x 10⁻⁶ A/cm²) dan menghasilkan efisiensi inhibitor (Inhibitor Efficiency / IE%) tertinggi mencapai 86,93%. Kurva polarisasi mengonfirmasi bahwa gel inhibitor ini bekerja secara efektif sebagai mixed-type barrier yang memblokir transfer massa dan muatan pada reaksi anodik maupun katodik secara simultan. Tingkat galat (error) antara pengujian alat dan perhitungan manual sangat rendah (0,26% – 0,27%), memvalidasi keakuratan data. Penelitian ini membuktikan bahwa formulasi gel tanin kulit jagung berpotensi besar diaplikasikan secara nyata dalam industri otomotif sebagai teknologi perlindungan sasis yang aman, bernilai ekonomis, dan berkelanjutan. Kata kunci: Korosi, Inhibitor, Ekstrak Kulit Jagung, Rangka
| Item Type: | Thesis (S2) |
|---|---|
| NIM/NIDN Creators: | 55824010008 |
| Uncontrolled Keywords: | Korosi, Inhibitor, Ekstrak Kulit Jagung, Rangka |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin 600 Technology/Teknologi > 660 Chemical Engineering and Related Technologies/Teknologi Kimia dan Ilmu yang Berkaitan > 669 Metallurgy/Metal, Metalurgi > 669.1 Ferrous Metals/Metalurgi Logam Besi dan Baja |
| Divisions: | Pascasarjana > Magister Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 04 Sep 2026 16:07 |
| Last Modified: | 04 Sep 2026 16:07 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/103639 |
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