Ibrahim, Raden Muhammad Admiral (2024) Penggunaan Ekstrak Rumput Laut Sebagai Inhibitor Korosi Pada Baja Karbon Rendah Api 5L Dalam Lingkungan Asam K sulfat (H2SO4) 0,1M. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.

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Abstract

One of the low carbon steels commonly found in everyday life is API 5L steel which is generally used as a storage material for H2SO4 acid solution to ensure safety, but there are leaks in the tank walls due to corrosion events due to exposure to sulfuric acid solution. In general, leaks in tank walls made from low carbon steel such as API 5L are ductile but susceptible to corrosion. Corrosion events occur due to exposure to atmospheric air during the loading and unloading process which causes the acid to become damper and more corrosive, resulting in rust products forming on the storage tank walls. Therefore, it is necessary to control corrosion by adding inhibitors. Seaweed extract inhibitor is a natural inhibitor because it contains antioxidant compounds and phenol derivative compounds which are able to reduce the rate of corrosion by administering the inhibitor in small doses in the corrosive environment of the H2SO4 solution. This research was conducted to determine the effect of the concentration of seaweed extract corrosion inhibitors on the corrosion rate of API 5L steel in 0.1 M H2SO4 media with varying concentrations of 0, 100, 200, 300, 400, 500 ppm, varying immersion of 0, 30, and 60 minutes. And additional temperature variations of 30, 40, and 50ᵒC. Corrosion testing uses two methods, namely Tafel polarization and EIS. The test results show that the seaweed extract works effectively at fairly high concentrations and low solution temperatures with long soaking times. The corrosion rate at a concentration of 500 ppm with a soaking time of 60 minutes at a temperature of 30ᵒC had the lowest corrosion rate, namely 135.0 mpy with an inhibition efficiency of 78.97%. Apart from that, SEM was also carried out to see the surface properties of the steel and the adsorption carried out by seaweed extract. It can be seen that the steel surface has hydrophilic properties, so it can easily bind with inhibitors and the SEM test results show that there are additional elements on the steel surface due to the adsorption process carried out by seaweed extract. The adsorption mechanism that occurs in seaweed extract is included in physical adsorption because it has a free energy value (ΔGads) which is in the range of -20 kJ/mol. Keywords: API 5L Steel, Corrosion, 0.1 M H2SO4 Solution, Corrosion Inhibitor, Seaweed Extract, Corrosion Rate, Inhibition Efficiency, Adsorption

Item Type:	Thesis (S1)
Contributors:	Contribution Contributors NIP/NIM Thesis advisor Dwiyanti, Yanyan 197710222005012002 Thesis advisor Kambuna, Bening 199008292020122013 Thesis advisor Priyotomo, Gadang 197904262001121004
Additional Information:	Salah satu baja karbon rendah yang biasa ditemukan dalam kehidupan sehari-hari ialah baja API 5L yang umumnya digunakan sebagai bahan penyimpanan larutan asam H2SO4 agar aman, namun terdapat terjadinya kebocoran dinding tangka akibat adanya pristiwa korosi akibat paparan dari larutan asam sulfat. Pada umumnya kebocoran dinding tangki yang berbahan dasar baja karbon rendah seperti API 5L yang ulet namun rentan korosi, peristiwa korosi terjadi akibat adanya paparan udara atmosfer pada saat proses bongkar muat yang menyebabkan asam menjadi lebih lembab dan lebih korosif sehingga terjadinya produk karat pada dinding tangki penyimpanan. Oleh sebab itu perlu adanya pengendalian korosi dengan penambahan inhibitor. Inhibitor ekstrak rumput laut merupakan inhibitor alami karena mengandung senyawa antioksidan dan senyawa turunan fenol yang dimana mampu menurunkan laju korosi dengan diberikannya inhibitor dalam dosis yang sedikit didalam lingkungan korosif larutan H2SO4. Penelitian ini dilakukan untuk mengetahui pengaruh konsentrasi inhibitor korosi ekstrak rumput laut terhadap laju korosi baja API 5L didalam media H2SO4 0,1 M dengan variasi konsentrasi 0, 100, 200, 300, 400, 500 ppm, variasi perendaman 0, 30, dan 60 menit. Dan penambahan variasi temperatur 30, 40, dan 50ᵒC. Pengujian korosi menggunakan dua metode, yaitu polarisasi tafel dan EIS. Hasil pengujian menunjukkan bahwa ekstrak rumput laut bekerja secara efektif di konsentrasi yang cukup tinggi dan temperatur larutan yang rendah dengan waktu perendaman yang cukup lama. Laju korosi pada konsentrasi 500 ppm dengan lama perendaman 60 menit di temperatur 30ᵒC memiliki laju korosi yang paling rendah yaitu 135,0 mpy dengan efisiensi inhibisi 78,97%. Selain itu dilakukan pula SEM untuk melihat sifat permukaan baja dan adsorpsi yang dilakukan ekstrak rumput laut. Dimana dapat diketahui bahwa permukaan baja memiliki sifat hidrofilik, sehingga dapat dengan mudah berikatan dengan inhibitor dan hasil pengujian SEM menunjukkan bahwa terdapat unsur tambahan pada permukaan baja karena adanya proses adsorpsi yang dilakukan oleh ekstrak rumput laut. Mekanisme adsorpsi yang terjadi pada ekstrak rumput laut termasuk ke dalam adsorpsi fisik karena memiliki nilai energi bebas (ΔGads) yang berada dikisaran -20 kJ/mol Kata Kunci: Baja API 5L, Korosi, Larutan H2SO4 0,1 M, Inhibitor Korosi, Ekstrak Rumput Laut, Laju Korosi, Efisiensi Inhibisi, Adsorpsi
Subjects:	T Technology > TN Mining engineering. Metallurgy
Divisions:	03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi
Depositing User:	Mr Raden Muhammad Amiral Ibrahim
Date Deposited:	28 Feb 2024 10:20
Last Modified:	28 Feb 2024 10:20
URI:	http://eprints.untirta.ac.id/id/eprint/33491

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