Analisis Pengaruh pH Dan Temperatur Lingkungan Terhadap Laju Korosi Stang Kopel Pada Penggerak Wesel Dalam Infrastruktur Jalur Kereta

Asmoro, Angga Widyo (2025) Analisis Pengaruh pH Dan Temperatur Lingkungan Terhadap Laju Korosi Stang Kopel Pada Penggerak Wesel Dalam Infrastruktur Jalur Kereta. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Wesel merupakan komponen rel kereta api yang berfungsi untuk mengubah arah lintasan kereta. Dikarenakan letak wesel berada pada lingkungan terbuka, maka wesel sangat rentan terhadap pengaruh lingkungan yang menyebabkan korosi. Korosi yang diakibatkan oleh reaksi elektrokimia antara logam dan lingkungan asam, terutama dari hujan asam dapat mempercepat degradasi material sehingga memicu kerusakan struktural pada wesel. Penelitian ini bertujuan untuk mengetahui laju korosi pada stang kopel wesel dalam kondisi pH yang bervariasi (4,5; 5; dan 5,5) dan temperatur 15°C, 20°C, 25°C, 30°C, 35°C. Metode yang digunakan untuk uji laju korosi meliputi Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy (EIS), dan Weight Loss, serta pengujian Metalografi untuk mengetahui kondisi pada surface material stang kopel. Pengujian X-Ray Fluorescence (XRF) dan X-Ray Diffraction (XRD) untuk mengetahui produk korosi. Hasil uji Potentiodynamic Polarization menunjukkan laju korosi tertinggi pada pH 4,5 dan temperatur 30°C, yaitu 0,85672 mm/tahun. Hasil EIS menunjukkan nilai tahanan polarisasi (Rp) terendah pada kondisi pH 4,5 dan temperatur 20°C, yaitu 943,45 Ω, yang menandakan lapisan pasif lebih rapuh dan mempercepat korosi. Sebaliknya, laju korosi terendah tercatat pada pH 5,5 dan temperatur 15°C dengan nilai 0,20371 mm/tahun, menunjukkan bahwa lapisan pasif lebih stabil dan perlindungan terhadap korosi lebih efektif, dengan Rp sebesar 2624,4 Ω. Produk korosi yang terbentuk adalah Fe₂O₃ (Hematit) 95%, yang dikonfirmasi dengan pengujian XRF, dan Fe₃O₄ (Magnetit) 88,3% serta FeO (Wustite) 11,7%, yang dikonfirmasi dengan hasil uji XRD. Hasil pengujian metalografi menunjukkan permukaan spesimen pada laju korosi tertinggi menunjukkan korosi seragam dengan bintik-bintik gelap. Pada perbesaran lebih tinggi, muncul indikasi awal dari korosi sumuran. Pada laju korosi terendah, ada endapan tidak merata dengan beberapa area utuh.
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A wesel is a railway component that functions to change the direction of the train track. Due to its location in an outdoor environment, a wesel is very susceptible to environmental influences that cause corrosion. Corrosion caused by electrochemical reactions between metal and acidic environments, especially from acid rain, can accelerate material degradation, causing structural damage to the wesel. This study is meant to figure out the corrosion rate on coupling rods in different pH levels (4.5, 5, and 5.5) and temperatures (15°C, 20°C, 25°C, 30°C, and 35°C). The methods used for corrosion rate testing include Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy (EIS), and Weight Loss, as well as Metalography testing to identify the condition of the coupling rod surface material. X-Ray Fluorescence (XRF) and X-Ray Diffraction (XRD) testing were used to identify corrosion products. The results of the Potentiodynamic Polarization test showed the highest corrosion rate at pH 4.5 and temperature 30°C, which is 0.85672 mm/year. The EIS results showed the lowest polarization resistance (Rp) value at pH 4.5 and a temperature of 20°C, which is 943.45 Ω, indicating that the passive layer is more fragile and accelerates corrosion. Meanwhile, the lowest corrosion rate was recorded at pH 5.5 and a temperature of 15°C, with a value of 0.20371 mm/year, indicating that the passive layer is more stable and provides more effective corrosion protection, with Rp of 2624.4 Ω. The corrosion products formed were Fe₂O₃ (Hematite) 95%, confirmed by XRF testing, and Fe₃O₄ (Magnetite) 88.3% and FeO (Wustite) 11.7%, confirmed by XRD test results. The results of metalography testing showed that the surface of the specimen at the highest corrosion rate showed uniform corrosion with dark spots. At higher enlargements, there were early indications of pitting corrosion. At the lowest corrosion rate, there were uneven deposits with some intact areas.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Wesel rel, Hujan asam, pH, Laju korosi, Produk Korosi,Railway Wesel, Acid rain, pH, Corrosion rate, Corrosion Product
Subjects:	Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD96F56 Fluorescence spectroscopy T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials T Technology > TD Environmental technology. Sanitary engineering > TD194.6 Environmental impact analysis
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Angga Widyo Asmoro
Date Deposited:	29 Jul 2025 08:09
Last Modified:	29 Jul 2025 08:09
URI:	http://repository.its.ac.id/id/eprint/122696

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