Pengaruh Fraksi Berat Sio₂ Kristobalit Pada Komposit Go/Sio₂ Berbasis Limbah Sekam Padi Dan Pasir Silika Sebagai Pelapis Anti Korosi

Alinan, Maichal Bushido (2025) Pengaruh Fraksi Berat Sio₂ Kristobalit Pada Komposit Go/Sio₂ Berbasis Limbah Sekam Padi Dan Pasir Silika Sebagai Pelapis Anti Korosi. Other thesis, Institut Sepuluh Nopember.

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Abstract

Korosi merupakan masalah utama dalam industri maritim yang dapat menyebabkan degradasi material, peningkatan biaya perawatan, serta penurunan efisiensi pada logam. Untuk mengatasi hal ini, penelitian ini berfokus pada pengembangan pelapis hidrofobik berbasis komposit grafena oksida (GO) dan SiO₂ kristobalit yang diperoleh dari limbah sekam padi dan pasir silika. Sintesis GO menggunakan metode Hummer, SiO₂ menggunakan metode sol gel berbasis pasir silika yg dimodifikasi dengan Cetyltrimethylammonium bromide sebagai surfaktan . Karakterisasi material dilakukan melalui X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), serta pengukuran Water Contact Angle (WCA) dan Uji Korosi. Variasi fraksi berat SiO₂ kristobalit memberikan pengaruh signifikan terhadap sifat morfologi, sudut kontak air (WCA), dan ketahanan korosi dari komposit. Hasil SEM menunjukkan bahwa peningkatan fraksi berat SiO₂ menghasilkan permukaan yang lebih kasar dan membentuk struktur mikro berpori yang baik, terutama pada variasi 4,5 dan 6 wt%. Uji korosi menggunakan metode Tafel menunjukkan bahwa lapisan cat yang dicampur komposit GO/SiO₂ pada fraksi berat optimum (sekitar 4,5–6 wt%) mampu menurunkan densitas arus korosi secara signifikan, serta meningkatkan tahanan polarisasi. Laju korosi pada sampel dengan komposit lebih rendah dibandingkan plat baja yang hanya dilapisi cat biasa. Secara keseluruhan, penelitian ini berhasil membuktikan bahwa material komposit berbasis GO/SiO₂ dari sumber alam seperti sekam padi dan pasir silika dapat digunakan sebagai bahan pelapis anti korosi yang efektif. Variasi fraksi berat SiO₂ berperan penting dalam menentukan karakteristik permukaan dan performa anti korosi material akhir.
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Corrosion is a major problem in the maritime industry that can cause material degradation, increased maintenance costs, and decreased efficiency in metals. To address this, this research focuses on the development of hydrophobic coatings based on a composite of graphene oxide (GO) and SiO₂ cristobalite obtained from rice husk waste and silica sand. Synthesis of GO using the Hummer method, SiO₂ using the sol gel method based on silica sand modified with CTAB as a surfactant. Material characterization was carried out through X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), as well as measurement of Water Contact Angle (WCA) and Corrosion Test. The variation of cristobalite SiO₂ concentration has a significant effect on the morphological properties, water contact angle (WCA), and corrosion resistance of the composite. SEM results show that increasing the SiO₂ concentration results in a rougher surface and forms a good porous microstructure, especially in the 4,5 and 6 wt% variations. Corrosion tests using the Tafel method showed that the paint coating mixed with GO/SiO₂ composite at the optimum concentration (about 4,5-6 wt%) was able to significantly reduce the corrosion current density, as well as increase the polarization resistance. The corrosion rate of the samples with the composite was lower than that of steel plates coated with ordinary paint. Overall, this study successfully proved that GO/SiO₂-based composite materials from natural sources such as rice husks and silica sand can be used as effective anticorrosive coating materials. The variation of SiO₂ concentration plays an important role in determining the surface characteristics and anticorrosive performance of the final material.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	hydrophobic, graphene oxide, SiO₂ cristobalite, corrosion, anti-corrosion coating. Hidrofobik, grafena oksida, SiO₂ kristobalit, korosi, pelapis antikorosi.
Subjects:	Q Science > QC Physics > QC173.4.C63 Composite materials
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Maichal Bushido Alinan
Date Deposited:	23 Jul 2025 06:18
Last Modified:	23 Jul 2025 06:18
URI:	http://repository.its.ac.id/id/eprint/120915

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