Pengaruh Variasi Konsentrasi Ekstrak Sekam Padi (Oryza Sativa L.) sebagai Inhibitor Organik terhadap Laju Korosi pada Baja API 5L Grade B dalam Media Korosif NACL 3,5%

Samanta, Aulia Diva (2026) Pengaruh Variasi Konsentrasi Ekstrak Sekam Padi (Oryza Sativa L.) sebagai Inhibitor Organik terhadap Laju Korosi pada Baja API 5L Grade B dalam Media Korosif NACL 3,5%. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi merupakan permasalahan utama pada baja karbon yang banyak digunakan dalam industri minyak dan gas, khususnya baja API 5L Grade B yang beroperasi di lingkungan mengandung ion klorida seperti air laut. Korosi pada baja API 5L Grade B di lingkungan ion klorida merupakan tantangan serius dalam industri minyak dan gas. Penelitian ini mengkaji efektivitas ekstrak sekam padi (Oryza sativa L.) sebagai inhibitor organik terhadap korosi baja API 5L Grade B dalam media NaCl 3,5% pada variasi konsentrasi 300, 400, 500, 600, dan 700 ppm dan waktu perendaman 10, 20, dan 30 hari. Senyawa aktif dikarakterisasi menggunakan Gas Chromatography-Mass Spectrometry (GC-MS), sementara efektivitas inhibisi dievaluasi melalui pengujian weight loss, polarisasi potensiodinamik (PDP), Electrochemical Impedance Spectroscopy (EIS), dan Atomic Force Microscopy (AFM). Konsentrasi optimum 700 ppm menghasilkan efisiensi inhibisi tertinggi sebesar 94,26% (weight loss), 65,67% (PDP), dan 81,01% (EIS), dengan laju korosi menurun drastis dari 0,1043 menjadi 0,0060 mmpy. Pergeseran Ecorr sebesar 216,88 mV mengindikasikan mekanisme inhibisi tipe anodik. Analisis AFM mengonfirmasi terbentuknya lapisan adsorpsi pelindung yang menurunkan kekasaran permukaan dengan Sa = 19,7 nm, Sq = 26,1 nm, Sz = 221 nm. Selain itu, model isoterm Temkin terbukti paling sesuai menggambarkan mekanisme adsorpsi inhibitor dengan nilai koefisien determinasi R² = 0,9016 pada 10 hari, 0,9609 pada 20 hari dan 0,9609 pada 30 hari, dengan nilai ΔG°ads antara −7,03 hingga −7,70 kJ/mol yang mengindikasikan adsorpsi spontan bersifat fisisorpsi pada permukaan heterogen.
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Corrosion of API 5L Grade B steel in chloride-rich environments poses a criticalchallenge in the oil and gas industry. This study investigates the effectiveness of rice husk(Oryza sativa L.) extract as an organic corrosion inhibitor for API 5L Grade B steel in 3.5%NaCl solution at concentrations of 300, 400, 500, 600, and 700 ppm over immersion periods of10, 20, and 30 days. Active compounds were characterized by Gas Chromatography-MassSpectrometry (GC-MS), while inhibition performance was evaluated through weight lossmeasurements, potentiodynamic polarization (PDP), Electrochemical Impedance Spectroscopy(EIS), and Atomic Force Microscopy (AFM). At the optimum concentration of 700 ppm,inhibition efficiencies reached 94.26% (weight loss), 65.67% (PDP), and 81.01% (EIS),reducing the corrosion rate dramatically from 0.1043 to 0.0060 mmpy. A corrosion potential(Ecorr) shift of 216.88 mV identified the extract as an anodic-type inhibitor. AFM analysisconfirmed the formation of a protective adsorption layer, evidenced by reduced surfaceroughness values of Sa = 19.7 nm, Sq = 26.1 nm, and Sz = 221 nm. Furthermore, the Temkinadsorption isotherm best described the inhibitor adsorption mechanism, with determinationcoefficients of R² = 0.9016 (10 days), 0.9609 (20 days), and 0.9609 (30 days), and ΔG°adsvalues ranging from −7.03 to −7.70 kJ/mol, indicating spontaneous physisorption on aheterogeneous surface.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi Isoterm, Baja API 5L, Inhibitor Organik, Korosi, Sekam Padi, Adsorption Isotherm, API 5L Steel, Corrosion, Organic Inhibitor, Rice Husk
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1185 Metal-cutting--Problems, exercises, etc. T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Aulia Diva Samanta
Date Deposited:	10 Jul 2026 04:27
Last Modified:	10 Jul 2026 04:27
URI:	http://repository.its.ac.id/id/eprint/134626

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