PENGARUH INHIBITOR ALAMI DARI KULIT BUAH COKLAT TERHADAP LAJU KOROSI BAJA KARBON RENDAH DAN SIFAT KEKERASANYA

GULTOM, ADE DWI SEPTIAWATI and Sari, Dewi Puspita (2025) PENGARUH INHIBITOR ALAMI DARI KULIT BUAH COKLAT TERHADAP LAJU KOROSI BAJA KARBON RENDAH DAN SIFAT KEKERASANYA. Undergraduate thesis, Sriwijaya University.

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Abstract

Corrosion in low-carbon steels such as ST42 is a serious problem in structural applications, especially in acidic environments. The use of natural inhibitors such as brown fruit peel (Theobroma cacao L.) offers an environmentally friendly solution. This research uses a pure experimental method. ST42 steel specimens are heated to 750°C and soaked in a solution of brown fruit peel extract for 24, 48, and 72 hours. Then, the specimen was soaked in a 3% citric acid solution for 168 hours. Testing includes corrosion rate measurement by weight loss method and hardness testing using the Vickers method. The untreated specimen had the highest hardness of 48,588 kgf/mm², while the lowest specimen after treatment was 31,859 kgf/mm². The lowest corrosion rate was recorded at 0.0000133840 mpy in specimens with a soaking time of 72 hours. Data show a decrease in corrosion as the duration of the inhibitor soaking increases. Brown fruit peel extract is effective in inhibiting the corrosion rate in ST42 steel, but causes a decrease in hardness value. This research contributes to the use of agricultural waste as an environmentally friendly inhibitor material. Follow-up research is recommended to evaluate microstructures and other mechanical properties post-treatment.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Asam sitrat; Ekstrak kulit buah coklat; Korosi; Perlakuan panas.
Subjects:	L Education > LT Textbooks > LT6-501 Textbooks. Class here textbooks covering several subjects. For textbooks on particular subjects, see the subject in B-Z T Technology > T Technology (General) > T61-173 Technical education. Technical schools
Divisions:	06-Faculty of Education and Educational Science > 83203-Mechanical Technique Education (S1)
Depositing User:	Ade Dwi Septiawati Gultom
Date Deposited:	23 May 2025 06:57
Last Modified:	23 May 2025 06:57
URI:	http://repository.unsri.ac.id/id/eprint/173924

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