Analisis Inhibisi Ekstrak Daun Bayam (Amaranthus Hybridus L) Sebagai Inhibitor Organik Pada Baja API 5L Grade B Dengan Variasi Temperatur Pada Lingkungan Asam

Herlambang, Figo (2025) Analisis Inhibisi Ekstrak Daun Bayam (Amaranthus Hybridus L) Sebagai Inhibitor Organik Pada Baja API 5L Grade B Dengan Variasi Temperatur Pada Lingkungan Asam. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi merupakan proses degradasi logam akibat reaksi elektrokimia antara logam dan lingkungannya, yang dapat menyebabkan penurunan sifat mekanik dan integritas struktural material. Salah satu upaya pengendalian korosi adalah melalui penggunaan inhibitor, yaitu senyawa kimia yang mampu memperlambat laju korosi meskipun dalam konsentrasi kecil. Penelitian ini bertujuan untuk mengkaji efektivitas ekstrak daun bayam (Amaranthus hybridus L) sebagai inhibitor organik terhadap laju korosi baja API 5L grade B dalam media HCl 1M. Ekstrak diperoleh melalui metode maserasi, dengan variasi konsentrasi 1.5 ml/L, 2.5 ml/L, dan 3.5 ml/L, serta variasi temperatur 20°C, 25°C, 30°C, 35°C, dan 40°C. Pengujian dilakukan menggunakan metode polarisasi potensiodinamik, Electrochemical Impedance Spectroscopy (EIS), weight loss, Fourier Transform Infrared Spectroscopy (FTIR), dan Scanning Electron Microscopy (SEM). Hasil pengujian menunjukkan bahwa efisiensi inhibisi tertinggi pada metode polarisasi tercapai pada temperatur 35°C dan konsentrasi 3.5 ml/L sebesar 88,62%, sedangkan pada metode EIS, efisiensi maksimum sebesar 82,30% diperoleh pada temperatur 25°C. Sementara itu, metode weight loss menghasilkan efisiensi tertinggi sebesar 96,02% setelah perendaman selama 3 jam pada konsentrasi 3.5 ml/L. Spektrum FTIR mengidentifikasi keberadaan gugus fungsi senyawa aktif yang terkandung dalam ekstrak daun bayam, yang berpotensi berperan dalam proses adsorpsi pada permukaan logam. Hasil SEM menunjukkan terbentuknya lapisan pelindung tipis pada permukaan baja, yang berkontribusi terhadap penghambatan difusi ion korosif.
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Corrosion is a degradation process of metals caused by electrochemical reactions between the metal and its environment, which can lead to the deterioration of mechanical properties and structural integrity of the material. One of the strategies to control corrosion is the use of inhibitors—chemical compounds capable of reducing the corrosion rate even at low concentrations. This study aims to evaluate the effectiveness of spinach leaf extract (Amaranthus hybridus L) as an organic inhibitor on the corrosion rate of API 5L grade B steel in a 1M HCl solution. The extract was obtained through maceration, with inhibitor concentrations varied at 1.5 ml/L, 2.5 ml/L, and 3.5 ml/L, and temperatures at 20°C, 25°C, 30°C, 35°C, and 40°C. The samples were tested using potentiodynamic polarization, Electrochemical Impedance Spectroscopy (EIS), weight loss, Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM). The polarization test results showed the highest inhibition efficiency of 88.62% at 35°C with a concentration of 3.5 ml/L, while the EIS method indicated maximum efficiency of 82.30% at 25°C with the same concentration. In the weight loss method, the highest efficiency of 96.02% was achieved after 3 hours of immersion at a concentration of 3.5 ml/L. FTIR spectra identified the presence of active functional groups in the spinach extract, which likely contribute to the adsorption process on the metal surface. SEM analysis revealed the formation of a thin protective layer on the steel surface, which helps inhibit the diffusion of corrosive ions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Korosi, Inhibitor Organik, Daun Bayam, Baja API 5L, HCL, Corrosion, Organic Inhibitors, Spinach Leaf, Steel API 5L, HCL
Subjects:	T Technology > T Technology (General) > TA404 Materials--Biodegradation 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 > TP Chemical technology > TP994 Surface active agents.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Figo Herlambang
Date Deposited:	29 Jul 2025 04:49
Last Modified:	29 Jul 2025 04:49
URI:	http://repository.its.ac.id/id/eprint/123164

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