PRATAMA, MAHENDRA (2025) ANALISIS LAJU KOROSI PADA BAJA SPH440-OD HASIL PROSES SHEARING DAN SLITTING PADA LINGKUNGAN ATMOSFER LAUT. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
SPH440-OD steel is a low-carbon steel widely used in the automotive and manufacturing industries due to its good mechanical properties. However, its corrosion resistance can be influenced by the cutting method applied, particularly shearing and slitting. This study aims to analyze the corrosion rate of SPH440-OD steel subjected to shearing and slitting processes in a marine atmospheric environment. The corrosion test was conducted using the weight loss method, where steel samples were exposed to the marine atmosphere for 30 days to evaluate their corrosion rates, surface morphology, and mechanical integrity. The results show that cutting methods significantly affect the microstructure and residual stress. Slitting produced finer microstructures and lower residual stresses, enhancing corrosion resistance. Corrosion rate testing revealed that sheared specimens had higher corrosion rates (0.000472–0.000486 g/cm²/day or approximately 0.87–0.90 mpy) compared to slit specimens (0.000278–0.000306 g/cm²/day or around 0.51–0.57 mpy). EDS analysis indicated dominant elements such as Fe (88.5 wt%) and O (6.2 wt%), with oxygen acting as a corrosion indicator. SEM observations confirmed that sheared samples exhibited deeper and more widespread pitting corrosion, while slit samples had smoother surfaces with fewer and shallower pits. These findings demonstrate that slitting significantly improves surface stability, reduces corrosion initiation, and extends the service life of SPH440-OD steel. Therefore, slitting is recommended for industrial applications in corrosive environments, particularly in marine and open-air conditions. Keywords: SPH440-OD steel, shearing, slitting, corrosion rate, marine atmosphere. Baja SPH440-OD merupakan baja karbon rendah yang banyak digunakan dalam industri otomotif dan manufaktur karena memiliki sifat mekanik yang baik. Namun, ketahanan terhadap korosi menjadi perhatian utama, terutama jika baja digunakan dalam lingkungan atmosfer laut yang agresif. Penelitian ini bertujuan untuk menganalisis pengaruh metode pemotongan—shearing dan slitting—terhadap laju korosi baja SPH440-OD. Pengujian dilakukan menggunakan metode weight loss dengan eksposur selama 30 hari di lingkungan atmosfer laut. Hasil penelitian menunjukkan bahwa metode pemotongan berpengaruh signifikan terhadap struktur mikro, tegangan sisa, dan laju korosi. Spesimen yang dipotong dengan metode shearing memiliki laju korosi lebih tinggi (0,000472–0,000486 g/cm²/hari) dibandingkan dengan slitting (0,000278–0,000306 g/cm²/hari). Uji EDS menunjukkan dominasi unsur Fe dan O, yang mengindikasikan reaksi oksidasi lebih intens pada hasil shearing. Analisis morfologi permukaan menggunakan mikroskop optik dan SEM menunjukkan pitting corrosion yang lebih parah pada spesimen hasil shearing, sementara slitting menunjukkan permukaan lebih halus dan teratur. Perbedaan ini disebabkan oleh besarnya tegangan sisa, yang berkontribusi terhadap inisiasi korosi. Dengan demikian, metode slitting lebih direkomendasikan karena mampu meminimalkan tegangan sisa, memperlambat korosi, dan meningkatkan umur pakai baja SPH440-OD, khususnya untuk aplikasi di lingkungan korosif seperti atmosfer laut. Kata kunci: Baja SPH440-OD, shearing, slitting, laju korosi, atmosfer laut.
| Item Type: | Thesis (S1) |
|---|---|
| Call Number CD: | FT/MSN. 25 099 |
| NIM/NIDN Creators: | 41321110024 |
| Uncontrolled Keywords: | Baja SPH440-OD, shearing, slitting, laju korosi, atmosfer laut. |
| Subjects: | 600 Technology/Teknologi > 660 Chemical Engineering and Related Technologies/Teknologi Kimia dan Ilmu yang Berkaitan > 669 Metallurgy/Metal, Metalurgi > 669.1 Ferrous Metals/Metalurgi Logam Besi dan Baja 600 Technology/Teknologi > 670 Manufacturing/Manufaktur, Pabrik-pabrik 600 Technology/Teknologi > 690 Buildings/Teknik Bangunan > 691 Building Material/Material Bangunan > 691.7 Ferrous Metals/Bahan Bangunan dari Logam Besi dan Baja |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 11 Sep 2025 06:17 |
| Last Modified: | 11 Sep 2025 06:17 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/97690 |
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