Sulaeman, Muhamad Aqsa Hafiz (2026) Analisis Pengaruh Coating Molibdenum Disulfida/Polytetrafluoroetilene (MoS2/PTFE) Terhadap Perilaku Korosi Pipa Api 5l Grade B pada Sistem Pipa Reinjeksi Geothermal. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Korosi pada sistem pipa reinjeksi geothermal menjadi salah satu penyebab utama penurunan keandalan dan umur pakai peralatan akibat paparan fluida kondensat yang mengandung ion korosif pada temperatur tinggi. Baja karbon API 5L Grade B banyak digunakan sebagai material pipa, namun memiliki ketahanan korosi yang terbatas sehingga memerlukan proteksi permukaan. Penelitian ini bertujuan menganalisis pengaruh coating polytetrafluoroethylene (PTFE) dengan penambahan filler molybdenum disulfida (MoS₂) terhadap perilaku korosi baja API 5L Grade B pada lingkungan kondensat geothermal. Coating diaplikasikan menggunakan metode air spray dengan variasi filler MoS₂ sebesar 5 wt%, 10 wt%, dan 15 wt%, kemudian dilakukan pengujian immersion selama 14 hari pada temperatur 40°C, 60°C, dan 80°C. Karakterisasi dilakukan menggunakan metode weight loss, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), dan pull off test. Hasil penelitian menunjukkan bahwa peningkatan temperatur menyebabkan laju korosi meningkat pada seluruh spesimen. Substrat tanpa coating mengalami korosi pitting dengan kategori severe berdasarkan NACE SP0775-2013 dengan laju korosi tertinggi 3,741 mmpy pada 80°C. Penambahan coating secara signifikan menurunkan laju korosi, performa terbaik pada 40°C dengan variasi PTFE + 15 wt% MoS₂ (efisiensi 93,84%, 0,121 mmpy), sedangkan pada temperatur 60°C dan 80°C PTFE only memberikan hasil optimal dengan efisiensi masing-masing 95,26% dan 92,94%. Namun penambahan filler MoS₂ belum mampu meningkatkan ketahanan korosi secara optimal akibat terbentuknya microcrack dan porositas pada lapisan coating. Hasil EIS menunjukkan coating PTFE memiliki resistansi polarisasi yang lebih tinggi dibandingkan coating PTFE/MoS₂, sedangkan analisis XRD mengidentifikasi produk korosi berupa Fe₃O₄ dan Fe₂O₃. Secara keseluruhan, coating PTFE memberikan performa proteksi korosi yang lebih baik dibandingkan coating PTFE dengan penambahan filler MoS₂.
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Corrosion in geothermal reinjection piping systems is one of the main causes of reduced equipment reliability and service life due to exposure to condensate containing corrosive ions at elevated temperatures. API 5L Grade B carbon steel is widely used as a pipe material, however its corrosion resistance is limited, requiring surface protection. This study aims to analyze the effect of polytetrafluoroethylene (PTFE) coating with the addition of molybdenum disulfide (MoS₂) filler on the corrosion behavior of API 5L Grade B steel in a geothermal condensate environment. The coating was applied using the air spray method with MoS₂ filler contents of 5 wt%, 10 wt%, and 15 wt%, followed by 14 days of immersion at 40°C, 60°C, and 80°C. Characterization was performed using the weight loss method, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and pull-off test. The results showed that increasing temperature increased the corrosion rate of all specimens. The uncoated substrate experienced severe pitting corrosion according to NACE SP0775-2013, with the highest corrosion rate of 3.741 mmpy at 80°C. Coating application significantly reduced the corrosion rate, with the best performance at 40°C achieved by PTFE + 15 wt% MoS₂ (93.84% efficiency, 0.121 mmpy), while at 60°C and 80°C, PTFE only provided the optimum performance with efficiencies of 95.26% and 92.94%, respectively. However, the addition of MoS₂ filler did not improve corrosion resistance optimally due to the formation of microcracks and porosity within the coating layer. EIS results showed that the PTFE coating exhibited higher polarization resistance than the PTFE/MoS₂ coating, while XRD analysis identified Fe₃O₄ and Fe₂O₃ as corrosion products. Overall, the PTFE coating provided better corrosion protection than the PTFE coating with the addition of MoS₂ filler.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | API 5L Grade B, Coating, PTFE/MoS2, Reinjeksi Geothermal, API 5L Grade B, Coating, PTFE/MoS₂, Geothermal Reinjection. |
| Subjects: | Q Science Q Science > QC Physics > QC173.4.C63 Composite materials Q Science > QC Physics > QC 611.97.T46 Temperature effects. Including transition temperature Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD481 Chemical structure. Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis Q Science > QE Geology > QE604 Deformation Q Science > QR Microbiology > QR96.8 Adhesion |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Muhamad Aqsa Hafiz Sulaeman |
| Date Deposited: | 23 Jul 2026 07:49 |
| Last Modified: | 23 Jul 2026 07:49 |
| URI: | http://repository.its.ac.id/id/eprint/136468 |
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