Analisis Pengaruh Variasi pH dan Waktu Perendaman Terhadap Ketahanan Sweet Corrosion pada Baja ASTM A36 di Lingkungan Laut

Chakim, M.Charis (2019) Analisis Pengaruh Variasi pH dan Waktu Perendaman Terhadap Ketahanan Sweet Corrosion pada Baja ASTM A36 di Lingkungan Laut. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perkembangan teknologi di bidang kemaritiman terus dilakukan, terutama pada sektor transportasi dan konstruksi bangunan laut. Baja ASTM A36 merupakan salah satu material yang paling umum digunakan sebagai bahan utama konstruksi bangunan laut. Namun, dalam penggunaannya baja menghadapi berbagai permasalahan, salah satunya adalah korosi yang dapat menyebabkan kegagalan struktur. Salah satu penyebab korosi di lingkungan laut adalah kandungan gas CO₂ yang terlarut dalam air laut dan memicu terjadinya sweet corrosion. Tingginya kadar CO₂ di lingkungan laut dipengaruhi oleh meningkatnya emisi dari penggunaan bahan bakar fosil yang pada akhirnya terakumulasi di laut. Penelitian ini bertujuan untuk mengevaluasi ketahanan baja ASTM A36 terhadap sweet corrosion serta mengidentifikasi karakteristik korosi yang terbentuk secara makroskopis dan mikroskopis di lingkungan laut. Pengujian dilakukan menggunakan metode immersion corrosion test dengan pendekatan weight loss. Variasi parameter yang digunakan meliputi pH 4, 5, 6, dan 7, dengan waktu perendaman selama 24, 72, 120, dan 168 jam. Hasil penelitian menunjukkan bahwa baja ASTM A36 memiliki ketahanan yang baik terhadap sweet corrosion. Persamaan regresi untuk memprediksi laju korosi akibat CO₂ pada pH 4, 5, 6, dan 7 berturut-turut adalah y = 0,05x + 9,08; y = −2,03x + 13,47; y = −3,57x + 21,59; dan y = −2,72x + 17,14. Hasil pengamatan permukaan baja secara makroskopis dan mikroskopis menunjukkan bahwa jenis korosi yang terbentuk adalah localized corrosion dan general corrosion.
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Technological development in the maritime sector continues to advance, particularly in marine transportation and offshore structural construction. ASTM A36 steel is one of the most widely used materials for marine structures due to its favorable mechanical properties and cost-effectiveness. However, its application is often limited by corrosion, which can lead to structural failure. One of the primary causes of corrosion in seawater is dissolved CO₂, which induces a type of degradation known as sweet corrosion. The increasing concentration of CO₂ in the marine environment is associated with rising fossil fuel emissions that ultimately enter the ocean. This study aimed to evaluate the corrosion resistance of ASTM A36 steel to sweet corrosion and to characterize the resulting corrosion morphology through macroscopic and microscopic observations. Corrosion testing was conducted using the immersion corrosion test method with the weight loss approach. The experimental parameters included seawater pH values of 4, 5, 6, and 7, with immersion durations of 24, 72, 120, and 168 hours. The results indicate that ASTM A36 steel exhibits good resistance to sweet corrosion. The regression equations developed to predict the corrosion rate caused by dissolved CO₂ at pH 4, 5, 6, and 7 are y = 0.05x + 9.08, y = −2.03x + 13.47, y = −3.57x + 21.59, and y = −2.72x + 17.14, respectively. Macroscopic and microscopic observations of the steel surface revealed that the dominant corrosion mechanisms were localized corrosion and general corrosion.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baja A36, Korosi CO2, Immersion corrosion test, pH, Sweet corrosion.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Chakim M. Charis
Date Deposited:	04 Jun 2026 04:09
Last Modified:	23 Jul 2026 07:57
URI:	http://repository.its.ac.id/id/eprint/63501

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