Pengaruh Konsentrasi Inhibitor Ekstrak Bunga Cengkeh dan Kecepatan Aliran Fluida terhadap Korosivitas Baja API 5L Grade B di Lingkungan H2SO4

Handayani, Sekar Fajar (2023) Pengaruh Konsentrasi Inhibitor Ekstrak Bunga Cengkeh dan Kecepatan Aliran Fluida terhadap Korosivitas Baja API 5L Grade B di Lingkungan H2SO4. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Inhibitor korosi organik merupakan salah satu metode proteksi korosi yang efektif karena bersifat biodegradable, terjangkau, dan ramah lingkungan. Inhibitor organik berasal dari ekstrak bahan alami yang memiliki senyawa antioksidan. Bunga cengkeh mengandung senyawa antioksidan berupa eugenol dan turunannya, juga caryophyllene, sehingga dapat dimanfaatkan sebagai inhibitor korosi. Dalam penelitian ini, dilakukan perendaman Baja API 5L Grade B pada larutan elektrolit dengan variasi konsentrasi inhibitor ekstrak bunga cengkeh dan kecepatan aliran fluida. Larutan elektrolit yang digunakan adalah H2SO4 0,5 M dan konsentrasi inhibitor yang digunakan sebanyak 0 ppm, 2000 ppm, 4000 ppm, 6000 ppm, dan 8000 ppm pada kecepatan aliran 0 m/s; 0,5 m/s; dan 1,2 m/s. Untuk mengetahui laju korosi pada penelitian ini digunakan uji Weight Loss dan Polarisasi Potensiodinamik. Sementara, untuk mendapatkan data pendukung dilakukan pengujian OES, GC-MS, EIS, FTIR, dan XRD. Dari hasil penelitian ini dibuktikan bahwa inhibitor ekstrak bunga cengkeh dapat menurunkan laju korosi karena adanya senyawa eugenol, eugenol asetat, dan caryophyllene yang teradsorpsi pada permukaan baja secara physisorption. Dari hasil pengujian weight loss, didapatkan bahwa pada kecepatan aliran statis, efisiensi inhibisi tertinggi 99,39% didapat pada konsentrasi inhibitor 8000 ppm. Pada kecepatan aliran laminar didapat efisiensi inhibisi tertinggi 98,24% pada konsentrasi inhibitor 4000 ppm. Pada kecepatan aliran turbulen didapat efisiensi inhibisi tertinggi 97,72% pada konsentrasi inhibitor 8000 ppm. Sehingga, pada aliran statis dan turbulen, semakin tinggi konsentrasi inhibitor maka semakin rendah laju korosi. Namun pada aliran laminar, desorpsi dapat terjadi dengan penambahan konsentrasi inhibitor, sehingga akan menurunkan efisiensi inhibisi. Jenis dari kecepatan aliran juga mempengaruhi laju korosi, dimana laju korosi terendah didapat pada aliran statis dan laju korosi tertinggi terdapat di aliran turbulen. Hal ini dikarenakan inhibitor yang teradsorpsi secara fisik dapat dihilangkan dari permukaan dengan gaya fisikal seperti peningkatan kecepatan.
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Organic corrosion inhibitors are an effective corrosion protection method because they are biodegradable, affordable and environmentally friendly. Organic inhibitors come from extracts of natural ingredients that have antioxidant compounds. Clove flowers contain antioxidant compounds in the form of eugenol and caryophyllene derivatives, so they can be used as corrosion inhibitors. In this research, API 5L Grade B Steel was immersed in an electrolyte solution with varying concentrations of clove flower extract inhibitors and fluid flow rates. The electrolyte solution used was 0.5 M H2SO4 and the inhibitor concentrations used were 0 ppm, 2000 ppm, 4000 ppm, 6000 ppm and 8000 ppm at a flow rate of 0 m/s; 0.5m/sec; and 1.2m/s. To determine the level of corrosion in this study used the Weight Loss test and Potentiodynamic Polarization. Meanwhile, to obtain supporting data, OES, GC-MS, EIS, FTIR, and XRD tests were carried out. From the results of this study it was proven that clove flower extract inhibitors could reduce corrosion levels due to the presence of eugenol, eugenol acetate, and caryophyllene compounds which were adsorbed on the steel surface by physisorption. From the results of the weight loss test, it was found that at static flow rates, the highest inhibition efficiency of 99.39% was obtained at an inhibitor concentration of 8000 ppm. At the laminar flow rate, the highest inhibition efficiency was 98.24% at an inhibitor concentration of 4000 ppm. At a turbulent flow rate, the highest inhibition efficiency was obtained at 97.72% at an inhibitor concentration of 8000 ppm. Thus, in static and turbulent flow, the higher the inhibitor concentration, the lower the corrosion rate. However, in laminar flow, desorption can occur with the addition of inhibitor concentration, thus reducing the efficiency of inhibition. The type of flow velocity also affects the corrosion rate, where the lowest corrosion rate is found in static flow and the highest corrosion rate is found in turbulent flow. This is because physically adsorbed inhibitors can be removed from the surface by physical forces such as increased velocity.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Ekstrak Bunga Cengkeh, Inhibitor Organik, Kecepatan Aliran, Korosi, Clove Flower Extract, Corrosion, Flow Velocity, Organic Inhibitor
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 Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Sekar Fajar Handayani
Date Deposited:	24 Jul 2023 08:34
Last Modified:	25 Jul 2023 10:35
URI:	http://repository.its.ac.id/id/eprint/99101

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