Khaerul, Rifky (2026) Analisis Pengaruh Coating Zirconium Silicate/Polytetrafluoroetilena (ZrSiO4/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
Energi panas bumi merupakan salah satu sumber energi terbarukan yang potensial bagi Indonesia, sejalan dengan target pemerintah untuk mencapai bauran energi terbarukan sebesar 23% pada tahun 2025 dan 31% pada tahun 2050. Namun demikian, korosi pada pipa reinjeksi geothermal menjadi tantangan serius yang mengancam keandalan sistem, terutama pada pipa API 5L Grade B yang umum digunakan namun memiliki ketahanan korosi relatif rendah terhadap fluida kondensat yang bersifat korosif. Penelitian ini menganalisis pengaruh coating ZrSiO4/PTFE terhadap perilaku korosi pipa API 5L Grade B pada sistem reinjeksi geothermal menggunakan pengujian weightloss, SEM-EDX, XRD, EIS, dan pull-off adhesion, dengan variasi konsentrasi filler ZrSiO4 (5, 10, dan 15 Wt%) dan suhu fluida kondensat (40, 60, dan 80 °C) selama 14 hari. Substrat tanpa coating mengalami korosi pitting kategori severe berdasarkan NACE SP0775-2013 dengan laju korosi tertinggi 3,7412 mmpy pada 80°C dan produk korosi Fe3O4, CaCO3, dan Fe2O3. Penambahan coating secara signifikan menurunkan laju korosi; performa terbaik pada 40°C diperoleh dari PTFE + ZrSiO4 15wt% (efisiensi 96,44%, 0,07 mmpy), sedangkan pada 60°C dan 80°C, PTFE tanpa filler memberikan hasil optimal dengan efisiensi masing-masing 95,24% dan 92,93%. Kenaikan laju korosi pada penambahan filler di suhu tinggi disebabkan ketidakselarasan Coefficient of Linier Thermal Expansion (CLTE) antara matriks PTFE (100 ppm/°C) dan ZrSiO4 (4–6 ppm/°C) yang memicu microcracking dan delaminasi. Analisis XRD mengkonfirmasi fasa produk korosi Fe3O4, CaCO3, dan Fe2O3 pada tanpa coating, kemudian FeO dan Fe3O4 setelah penambahan coating.
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Geothermal energy is a potential renewable energy source for Indonesia, aligning with the government's target to achieve a renewable energy mix of 23% by 2025 and 31% by 2050. However, corrosion in geothermal reinjection pipelines poses a serious challenge that threatens system reliability, particularly in commonly used API 5L Grade B pipes, which exhibit relatively low corrosion resistance against corrosive condensate fluids. This study investigates the effect of ZrSiO4/PTFE coatings on the corrosion behavior of API 5L Grade B pipes in a geothermal reinjection system using weight loss testing, SEM-EDX, XRD, EIS, and pull-off adhesion tests, with variations in ZrSiO4 filler concentration (5, 10, and 15 wt%) and condensate fluid temperature (40, 60, and 80 °C) over a 14-day immersion period. The uncoated substrate experienced severe pitting corrosion based on the NACE SP0775-2013 standard, with a peak corrosion rate of 3.7412 mmpy at 80 °C and corrosion products consisting of Fe3O4, CaCO3, and Fe2O3. The application of the coating significantly reduced the corrosion rate; the highest performance at 40 °C was achieved by PTFE + ZrSiO4 15 wt% (efficiency of 96.44%, 0.07 mmpy), whereas at 60 °C and 80 °C, neat PTFE (without filler) yielded optimal results with efficiencies of 95.24% and 92.93%, respectively. The increased corrosion rate observed with filler addition at elevated temperatures was attributed to the Coefficient of Linear Thermal Expansion (CLTE) mismatch between the PTFE matrix (100 ppm/°C) and the ZrSiO4 filler (4–6 ppm/°C), which induced microcracking and delamination. XRD analysis confirmed the presence of Fe3O4, CaCO3, and Fe2O3 corrosion product phases on the uncoated substrate, shifting to FeO and Fe3O4 following coating application.
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