HARTONO, TONI (2025) ANALISIS EFEKTIVITAS GREEN INHIBITOR EKSTRAK BIJI ALPUKATTERHADAP LAJU KOROSI BAJA JIS G3101 DENGAN TEKNIK PELAPISAN ELECTROPHORESIS DISPOSITION (EPD) PADA MEDIA AIR LAUT. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Steel materials play an important role in the shipbuilding industry, both in the construction and repair of ships. The use of steel materials in the ship industry is widespread on ship hulls, piping, main and auxiliary machinery, as well as ship armaments. Corrosion is a serious material degradation phenomenon in the industrial sector, especially on steel materials, which can cause significant economic losses and a decline in structural function. In an effort to find more sustainable and environmentally friendly solutions compared to synthetic inhibitors, this study focuses on analyzing the effectiveness of avocado seed extract as a natural green inhibitor. Avocado seed extract was chosen considering its active compounds such as tannins, polyphenols, and flavonoids that have the potential as anti-corrosion agents, as well as its abundant availability as agricultural waste in Indonesia. This study aims to evaluate the ability of avocado seed extract to reduce the corrosion rate on JIS G3101 steel when exposed to seawater media. The coating method used is Electrophoretic Deposition (EPD), a technique known to produce homogeneous and evenly distributed layers on substrates. JIS G3101 steel samples were treated with variations of avocado seed extract coating weights, which were then tested for corrosion rate using the potentiodynamic electrochemical method. In addition, the changes in the surface morphology of the steel before and after coating as well as after exposure to corrosive media were analyzed using an optical microscope. The corrosion rate inhibition ability of JIS G-3101 steel using the Electrophoretic Deposition (EPD) coating technique and potentiodynamic polarization corrosion rate method was tested with inhibitor concentration variations of avocado seed extract at 0 grams (without coating), 1%, 2%, and 3% dissolved in 100 ml of distilled water as solvent. The optimal corrosion rate reduction results were found at 2 grams inhibitor concentration with an anodic Tafel slope (Ba) of 141.73 mV, cathodic Tafel slope (Bc) of 93.262 mV, corrosion rate (CR) of 0.0010591 mm/year, and an inhibition efficiency of 99.04%. Keywords: Green inhibitor, avocado seed extract, Electrophoretic Deposition (EPD), corrosion rate, JIS G3101 steel, seawater, potentiodynamics, surface morphology. Material baja memiliki peran penting dalam industri perkapalan, baik dalam pembangunan maupun reparasi kapal. Penggunaan material baja pada industri kapal banyak digunakan pada bagian lambung kapal, pipa-pipa kapal, permesinan utama dan bantu kapal, serta persenjataan kapal. Korosi merupakan fenomena degradasi material yang serius pada sektor industri, terutama pada material baja, yang dapat menyebabkan kerugian ekonomi signifikan dan penurunan fungsi struktural. Dalam upaya mencari solusi yang lebih berkelanjutan dan ramah lingkungan dibandingkan penggunaan inhibitor sintetis, penelitian ini berfokus pada analisis efektivitas ekstrak biji alpukat sebagai green inhibitor alami. Ekstrak biji alpukat dipilih mengingat kandungan senyawa aktif seperti tanin, polifenol, dan flavonoid yang berpotensi sebagai agen anti-korosi, serta ketersediaannya yang melimpah sebagai limbah pertanian di Indonesia. Penelitian ini bertujuan untuk mengevaluasi kemampuan ekstrak biji alpukat dalam menekan laju korosi pada baja JIS G3101 ketika terpapar media air laut. Metode pelapisan yang digunakan adalah Electrophoretic Deposition (EPD), sebuah teknik yang dikenal mampu menghasilkan lapisan yang homogen dan terdistribusi merata pada substrat. Sampel baja G3101 diberi perlakuan dengan variasi berat pelapisan ekstrak biji alpukat, yang kemudian diuji laju korosinya melalui metode elektrokimia potentiodinamik. Selain itu, perubahan morfologi permukaan baja sebelum dan sesudah pelapisan serta setelah terpapar media korosif dianalisis menggunakan mikroskop optikal. Dengan diuji kemampuannya dalam menghambat laju korosi baja JIS G-3101 dengan menggunakan teknik pelapisan Electrophoresis Disposition (EPD) dengan metode laju korosi elektrokimia teknik polarisasi potensiodinamik mendapatkan hasil pengujian dengan variasi konsentrasi inhibitor ekstrak biji alpukat 0 %(tanpa pelapisan), 1%, 2%, dan 3% yang dilarutkan dengan 100 ml aquades sebagai pelarut mendapatkan hasil yang optimal penurunan laju korosi pada variasi konsentrasi inhibitor 2% dengan tafel slope anodik (Ba) 141.73 mV, katodik (Bc) 93.262 mV, dan Corrosion Rate (CR) 0.0010591 mmPY dengan efisiensi inhibisi 99,04 %. Kata kunci: Green inhibitor, ekstrak biji alpukat, Electrophoretic Deposition (EPD), laju korosi, baja JIS G3101, air laut, potentiodinamik, morfologi permukaan.
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