FRIANSYAH, MUHAMMAD FAJAR (2025) ANALISIS EFEKTIVITAS GREEN INHIBITOR EKSTRAK BUNGA SEPATU TERHADAP LAJU KOROSI BAJA G3101 DENGAN TEKNIK PELAPISAN ELECTROPHORESIS DISPOSITION (EPD) PADA MEDIA AIR LAUT. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Ships play a vital role in global transportation and trade, serving as a key component in the operational activities of the maritime industry. One of the common issues encountered is leakage in LO Cooler pipes caused by direct contact with seawater, which accelerates the corrosion rate and may lead to structural degradation as well as significant financial losses. To date, the industry still largely relies on chemical-based corrosion inhibitors such as nitrites, phosphates, and chromates. Although effective, these compounds are toxic and can contaminate aquatic and soil ecosystems, raising environmental concerns and drawing attention in the development of sustainable technologies. The extract of Hibiscus rosa-sinensis has the potential to serve as an ecofriendly green inhibitor, offering an alternative to toxic chemical inhibitors. This study investigates the effectiveness of Hibiscus rosa-sinensis extract in inhibiting the corrosion of JIS G-3101 steel in seawater through the Electrophoretic Deposition (EPD) coating technique. The experiments were conducted with extract concentrations of 1% m/v, 2% m/v, and 3% m/v, with an EPD processing time of 45 minutes. The results indicate that the addition of Hibiscus rosa-sinensis extract significantly reduced the corrosion rate, particularly at a concentration of 2% m/v, where the rate drastically decreased to 0.07956 mmpy. The test specimens measured 20 mm × 10 mm × 2.5 mm, with an effective surface area of 10 mm². Surface morphology analysis using an optical microscope revealed a noticeable reduction in corrosion damage after the application of the inhibitor. These findings are expected to serve as a reference for the development of corrosion inhibitors derived from natural materials, while also supporting the implementation of environmentally friendly and sustainable technologies in the maritime industry. Keywords: Corrosion, Seawater, Green Inhibitor, Estract of Hibiscus Flower Kapal laut Kapal laut memegang peranan vital dalam transportasi dan perdagangan global, menjadi komponen utama dalam aktivitas operasional industri maritim. Salah satu permasalahan yang sering terjadi adalah kebocoran pada pipa LO Cooler akibat kontak langsung dengan air laut, yang mempercepat laju korosi dan berpotensi menimbulkan degradasi struktural serta kerugian signifikan. Hingga kini, sektor industri masih banyak menggunakan inhibitor korosi berbasis senyawa kimia seperti nitrit, fosfat, dan kromat. Meskipun efektif, senyawa ini bersifat toksik dan dapat mencemari ekosistem perairan serta tanah, sehingga penggunaannya menimbulkan masalah lingkungan dan menjadi sorotan dalam pengembangan teknologi berkelanjutan. Ekstrak bunga sepatu (Hibiscus rosa-sinensis) berpotensi menjadi green inhibitor yang ramah lingkungan untuk menggantikan inhibitor kimia toksik. Penelitian ini menguji efektivitas ekstrak bunga sepatu dalam menghambat korosi baja JIS G-3101 di media air laut dengan teknik pelapisan Electrophoretic Deposition (EPD). Pengujian dilakukan dengan variasi konsentrasi 1% m/v, 2% m/v, dan 3% m/v, serta lama proses EPD 45 menit. Hasil menunjukkan bahwa penambahan ekstrak bunga sepatu secara signifikan menurunkan laju korosi, terutama pada konsentrasi 2% m/v, di mana laju korosi turun drastis menjadi 0,07956 mmpy. Spesimen uji berukuran 20 mm × 10 mm × 2,5 mm dengan luas permukaan kerja 10 mm². Analisis morfologi permukaan menggunakan mikroskop optik memperlihatkan berkurangnya kerusakan akibat korosi setelah perlakuan inhibitor. Temuan ini diharapkan dapat menjadi referensi untuk pengembangan inovasi inhibitor korosi berbasis bahan alami sekaligus mendukung penerapan teknologi ramah lingkungan dan berkelanjutan di industri maritim. Kata kunci : : Korosi, Air Laut, Green inhibitor, Ekstrak Bunga Sepatu
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