Pratiwi, Audi (2025) Analisis Ekstrak Kubis Putih (Brassica Oleracea Var. Capitata) Sebagai Inhibitor Korosi Pada Baja API 5L Grade B Dengan Variasi Waktu Perendaman di Media Korosif H2SO4. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Korosi merupakan permasalahan umum yang terjadi pada peralatan logam, khususnya pipa baja karbon, di industri minyak dan gas. Faktor-faktor penyebab korosi pada logam yaitu uap, air, asam, garam, dan suhu yang tinggi. Korosi tidak dapat dihindari atau dihilangkan tetapi dapat dikontrol. Salah satunya metode untuk mengontrol korosi yaitu dengan menggunakan inhibitor. Inhbitor adalah suatu senyawa kimia yang dalam jumlah kecil namun dapat menahan atau menghambat rekasi korosi logam baja dengan lingkunganya. Salah satunya yang dapat digunakan untuk inhibitor organik yaitu kubis putih. Penelitian ini untuk mengetahui pengaruh konsentrasi ekstrak kubis putih dengan perbedaan waktu perendaman sebagai inhibitor korosi pada baja API 5L grade B media 1M H₂SO₄. Pada penelitian ini memvariasikan konsentrasi ekstrak kubis yaitu 0 ml/L, 50 ml/L, 70 ml/L, 90 ml/L, 110 ml/L dan 130 ml/L dengan melakukan perendaman selama 2 jam, 3 jam, dan 4 jam. Pengujian yang dilakukan pada sampel uji yaitu Fourirer Transform Infra Red, Polarisasi, Electrochemical Impedance Spectroscopy, Weight Loss, dan Scanning Elecrtron Microscopy. Pada pengujian polarisasi dengan efisiensi tertinggi terletak pada waktu perendaman 4 jam konsentrasi 110 ml/L sebesar 99,21% sedangkan pengujian EIS dengan efisiensi tertinggi berada pada waktu perendaman 3 jam konsentrasi 110 ml/L sebesar 93,97%. Dari pengujian weight loss di ambil dari sampel hasil terbaik pengujian polarisasi kemudian didapatkan hasil pengujian weight loss yaitu dengan efisiensi tertinggi sebesar 91,60% pada 110 ml/L. Pengujian FTIR menunjukkan adanya gugus fungsi yang teradsorpsi pada permukaan baja API 5L grade B. Hasil SEM menunjukkan permukaan yang halus dikarenakan inhibitor kubis putih mampu membantu menghambat laju korosi yang sedang terjadi pada spesimen.
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Corrosion is a common problem that occurs in metal equipment, particularly carbon steel pipes, in the oil and gas industry. The factors that cause corrosion in metals are steam, water, acid, salt, and high temperatures. Corrosion cannot be avoided or eliminated, but it can be controlled. One method of controlling corrosion is by using inhibitors. An inhibitor is a chemical compound that, in small quantities, can prevent or inhibit the corrosion reaction between steel and its environment. One example of an organic inhibitor that can be used is white cabbage. This study aims to determine the effect of white cabbage extract concentration and different immersion times as a corrosion inhibitor on API 5L Grade B steel in a 1M H₂SO₄ medium. In this study, the concentration of cabbage extract was varied at 0 ml/L, 50 ml/L, 70 ml/L, 90 ml/L, 110 ml/L, and 130 ml/L, with immersion times of 2 hours, 3 hours, and 4 hours. The tests conducted on the test samples included Fourier Transform Infrared Spectroscopy, Polarization, Electrochemical Impedance Spectroscopy, Weight Loss, and Scanning Electron Microscopy. In the polarization test, the highest efficiency was achieved at a soaking time of 4 hours and a concentration of 110 ml/L, with an efficiency of 99.21%, while in the EIS test, the highest efficiency was achieved at a soaking time of 3 hours and a concentration of 110 ml/L, with an efficiency of 93.97%. From the weight loss testing, the best sample from the polarization testing was selected, resulting in a weight loss efficiency of 91.60% at 110 ml/L. FTIR testing showed the presence of adsorbed functional groups on the surface of API 5L grade B steel. SEM results show a smooth surface because white cabbage inhibitors are able to help inhibit the rate of corrosion occurring on the specimen.
Item Type: | Thesis (Other) |
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Uncontrolled Keywords: | smart trash bin, PLTS, proximity induktif |
Subjects: | T Technology > TS Manufactures > TS320 Steel--Metallurgy. T Technology > TS Manufactures > TS699 Powder coating of metals |
Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
Depositing User: | Audi Pratiwi |
Date Deposited: | 04 Aug 2025 02:27 |
Last Modified: | 04 Aug 2025 08:58 |
URI: | http://repository.its.ac.id/id/eprint/126800 |
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