SIMATUPANG, AHMAD NURDIN (2026) ANALISIS LAJU KOROSI STAINLESS STEEL SS 316L PADA SISTEM PIPA PENDINGIN KAPAL DI MEDIA AIR LAUT MENGGUNAKAN GREEN INHIBITOR EKSTRAK KUNYIT DENGAN METODE ELEKTROKIMIA. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The seawater cooling pipe system on ships (sea water cooling system) uses seawater directly as a cooling medium, exposing the pipes to highly corrosive chloride ions (Cl⁻). Stainless steel 316L (SS316L) is widely used in this system due to its corrosion resistance, but it remains susceptible to pitting and crevice corrosion caused by chloride attack. This study aims to (1) determine the corrosion rate of SS316L in seawater using electrochemical testing, (2) evaluate the effect of adding a green inhibitor derived from turmeric (Curcuma longa) extract at concentrations of 2%, 6%, 10%, and 12% with immersion times of 24, 168, and 240 hours, and (3) identify changes in surface morphology using a Scanning Electron Microscope (SEM). Electrochemical testing was carried out using the Potentiodynamic Polarization (PDP) method with a CorrTest CS350 potentiostat and a three-electrode system in natural seawater collected from Ancol Beach, Jakarta. SS316L without inhibitor showed an increasing corrosion rate with immersion time: 0.04266 mmPY (24 hours), 0.061145 mmPY (168 hours), and 0.091576 mmPY (240 hours). The addition of turmeric extract inhibitor significantly reduced the corrosion rate, with a concentration of 10% providing the most optimum result: corrosion rates of 0.025109 mmPY (24 hours), 0.006584 mmPY (168 hours), and 0.0055759 mmPY (240 hours), corresponding to the highest inhibition efficiency of 93.91% at 240 hours. Increasing the concentration beyond 10% (to 12%) actually decreased the inhibition efficiency, presumably due to instability of the adsorption layer. SEM results showed the formation of a protective layer on SS316L treated with 10% inhibitor, with substantially less surface damage compared to the specimen without inhibitor.This study concludes that turmeric extract has potential as an environmentally friendly and effective green corrosion inhibitor for protecting SS316L in ship cooling pipe systems, serving as a sustainable alternative to conventional toxic synthetic inhibitors. Keywords: Stainless Steel 316L, green inhibitor, corrosion, turmeric extract, SEM. Sistem pipa pendingin kapal (sea water cooling system) menggunakan air laut langsung sebagai media pendingin, sehingga pipa terpapar ion klorida (Cl⁻) yang sangat korosif. Stainless steel 316L (SS316L) banyak digunakan pada sistem ini karena ketahanan korosinya, namun tetap rentan pitting dan crevice corrosion akibat serangan klorida. Penelitian ini bertujuan untuk (1) menentukan laju korosi SS316L dalam air laut menggunakan pengujian elektrokimia, (2) mengevaluasi pengaruh penambahan green inhibitor ekstrak kunyit (Curcuma longa) pada konsentrasi 2%, 6%, 10%, dan 12% dengan waktu perendaman 24, 168, dan 240 jam, serta (3) mengidentifikasi perubahan morfologi permukaannya menggunakan Scanning Electron Microscope (SEM). Pengujian elektrokimia dilakukan dengan metode Potentiodynamic Polarization (PDP) menggunakan potensiostat CorrTest CS350 sistem tiga elektroda pada air laut alami dari Pantai Ancol, Jakarta. SS316L tanpa inhibitor mengalami peningkatan laju korosi seiring waktu perendaman: 0,04266 mmPY (24 jam), 0,061145 mmPY (168 jam), dan 0,091576 mmPY (240 jam). Penambahan inhibitor ekstrak kunyit menurunkan laju korosi secara signifikan, dengan konsentrasi 10% memberikan hasil paling optimum: laju korosi 0,025109 mmPY (24 jam), 0,006584 mmPY (168 jam), dan 0,0055759 mmPY (240 jam), setara efisiensi inhibisi tertinggi 93,91% pada 240 jam. Peningkatan konsentrasi melebihi 10% (12%) justru menurunkan efisiensi inhibisi, diduga akibat ketidakstabilan lapisan adsorpsi. Hasil SEM menunjukkan terbentuknya lapisan pelindung pada SS316L yang diberi inhibitor 10%, dengan kerusakan permukaan jauh lebih rendah dibandingkan spesimen tanpa inhibitor. Penelitian ini menyimpulkan ekstrak kunyit berpotensi sebagai green corrosion inhibitor yang ramah lingkungan dan efektif melindungi SS316L pada sistem pipa pendingin kapal, sebagai alternatif berkelanjutan terhadap inhibitor sintetis konvensional yang toksik. Kata Kunci : Stainless Steel 316L, inhibitor hijau, korosi, ekstrak kunyit, SEM.
| Item Type: | Thesis (S1) |
|---|---|
| NIM/NIDN Creators: | 41322010029 |
| Uncontrolled Keywords: | Stainless Steel 316L, inhibitor hijau, korosi, ekstrak kunyit, SEM. |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin 700 Arts/Seni, Seni Rupa, Kesenian > 710 Civic and Lanscape Art/Seni Perkotaan dan Pertamanan > 716 Herbaceous Plants in Landscape Architecture/Tanaman Herbal dalam Desain Arsitektur |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 28 Aug 2026 08:46 |
| Last Modified: | 28 Aug 2026 08:46 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/103478 |
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