Analisis Mekanisme Inhibisi Ekstrak Cengkeh Sebagai Inhibitor Untuk Baja Api 5l Grade B Dengan Variasi Waktu Perendaman Di Lingkungan Asam

Al Hakim, Muhammad Arif (2025) Analisis Mekanisme Inhibisi Ekstrak Cengkeh Sebagai Inhibitor Untuk Baja Api 5l Grade B Dengan Variasi Waktu Perendaman Di Lingkungan Asam. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini membahas mekanisme inhibisi ekstrak daun cengkeh (Syzygium aromaticum) sebagai inhibitor korosi ramah lingkungan terhadap baja karbon API 5L Grade B dalam lingkungan asam (larutan HCl 0,5 M). Baja API 5L Grade B merupakan material umum di industri minyak dan gas karena kekuatan tariknya yang tinggi, namun tetap rentan terhadap korosi, terutama di lingkungan dengan kandungan klorida tinggi seperti air laut. Penggunaan inhibitor organik dari bahan alami seperti cengkeh menjadi solusi potensial karena kandungan senyawa antioksidan di dalamnya, seperti eugenol, flavonoid, dan tanin, yang berperan dalam pembentukan lapisan pelindung pada permukaan logam. Penelitian ini menggunakan variasi konsentrasi inhibitor sebesar 15 ppm, 20 ppm, dan 25 ppm serta variasi waktu perendaman selama 2, 4, 6, 8, dan 10 jam untuk mengetahui kondisi optimal inhibisi. Berbagai metode pengujian dilakukan, meliputi Electrochemical Impedance Spectroscopy (EIS), polarisasi potensiodinamik, metode kehilangan berat (weight loss), FTIR, dan SEM. Hasil uji EIS menunjukkan bahwa nilai resistansi polarisasi (Rp) tertinggi ditemukan pada konsentrasi 15 ppm pada waktu perendaman 8–10 jam, yang mengindikasikan efektivitas maksimal inhibitor dalam menghambat korosi. Pada konsentrasi lebih tinggi, efektivitas justru menurun, kemungkinan disebabkan oleh kejenuhan molekul inhibitor atau ketidakstabilan lapisan protektif. Penelitian ini membuktikan bahwa ekstrak cengkeh mampu mengurangi laju korosi hingga efisiensi inhibisi mendekati 99.79% dari hasil uji polarisasi potensiodinamik. Oleh karena itu, cengkeh memiliki potensi sebagai green inhibitor yang efisien, murah, dan aman terhadap lingkungan, terutama untuk aplikasi pelindung material baja di lingkungan asam dan laut. Temuan ini diharapkan menjadi kontribusi nyata dalam pengembangan teknologi mitigasi korosi yang berkelanjutan dan aplikatif dalam industri.
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This study discusses the inhibition mechanism of clove leaf extract (Syzygium aromaticum) as an environmentally friendly corrosion inhibitor for API 5L Grade B carbon steel in an acidic environment (0.5 M HCl solution). API 5L Grade B steel is a common material in the oil and gas industry due to its high tensile strength, but it remains susceptible to corrosion, especially in environments with high chloride content such as seawater. The use of organic inhibitors from natural sources like cloves offers a potential solution due to their antioxidant compounds, such as eugenol, flavonoids, and tannins, which play a role in forming a protective layer on the metal surface. This study used variations in inhibitor concentration of 15 ppm, 20 ppm, and 25 ppm, as well as variations in immersion time of 2, 4, 6, 8, and 10 hours to determine the optimal inhibition conditions. Various testing methods were employed, including Electrochemical Impedance Spectroscopy (EIS), potentiodynamic polarization, weight loss method, FTIR, and SEM. EIS test results showed that the highest polarization resistance (Rp) value was found at a concentration of 15 ppm during immersion times of 8–10 hours, indicating the inhibitor's maximum effectiveness in inhibiting corrosion. At higher concentrations, effectiveness actually decreases, possibly due to inhibitor molecule saturation or instability of the protective layer. This study proves that clove extract can reduce the corrosion rate to an inhibition efficiency of nearly 99.79% based on the results of potentiodynamic polarization testing. Therefore, cloves have the potential as an efficient, cost-effective, and environmentally safe green inhibitor, particularly for protecting steel materials in acidic and marine environments. This finding is expected to contribute significantly to the development of sustainable and practical corrosion mitigation technologies in the industry.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Korosi, Inhibitor Organik, Ekstrak Cengkeh, Baja API 5L Grade B, Variasi Konsentrasi, Variasi Waktu Perendaman, PDP, EIS
Subjects:	T Technology > T Technology (General) > TA404 Materials--Biodegradation T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Muhammad Arif Al Hakim
Date Deposited:	30 Jul 2025 07:33
Last Modified:	30 Jul 2025 07:33
URI:	http://repository.its.ac.id/id/eprint/123975

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