Suyono, Suyono (2025) Analisis Pengaruh Jenis Pelapis Organik Dalam Pelapisan Sistem Duplex Terhadap Struktur Mikro Dan Ketahanan Degradasi Pelapis Pada Material Thermally Sprayed Aluminum (TSA) Di Lingkungan Laut. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Thermally Sprayed Aluminium (TSA) dengan pelapis organik digunakan sebagai metode perlindungan sistem duplex pada baja terhadap korosi di lingkungan laut. Namun, beberapa degradasi terjadi setelah paparan lingkungan laut dalam waktu singkat. Studi ini bertujuan mengevaluasi kinerja lapisan TSA duplex pada baja ASTM A36 yang dilapisi aluminium 99.5%, kemudian dilapisi berbagai pelapis organik seperti Mastic Epoxy, Aluminum Pigmented Epoxy, dan Glass Flake Epoxy. Sampel dalam kondisi tanpa cacat dan dengan cacat lapisan diuji dengan metode salt spray (ISO 9227). Hasil analisis struktur makro menunjukkan bahwa TSA duplex mampu mempertahankan integritasnya setelah uji salt spray. Pada sampel dengan cacat lapisan, sampel 1B menunjukkan perlindungan terbaik akibat pembentukan lapisan Mg(OH)₂ yang berperan sebagai pelindung tambahan, sedangkan sampel 4B memiliki performa proteksi terburuk akibat degradasi signifikan dan pembentukan gelembung korosi. Pada sampel tanpa cacat, sampel 3A menunjukkan performa terbaik dengan permukaan yang lebih homogen dan degradasi minimal, sementara sampel 4A menunjukkan perlindungan terburuk akibat ketidakteraturan permukaan dan degradasi yang lebih besar. Hasil analisis elektrokimia setelah uji salt spray menunjukkan bahwa sampel 3B memiliki laju korosi terendah sebesar 3.01 mm/y dan resistansi polarisasi tertinggi sebesar 535,89 Ω.cm², sementara sampel 4B menunjukkan performa terendah dengan laju korosi 3,1575 mm/y dan resistansi polarisasi 199,08 Ω.cm². TSA tanpa pelapis organik menunjukkan ketahanan korosi terbaik dengan laju korosi 2,8305 mm/y dan resistansi polarisasi 571,52 Ω.cm². Analisis XRD menunjukkan TSA dan lapisan organik efektif menjaga struktur kristal meskipun terdapat sedikit pergeseran sudut 2θ setelah uji salt spray. Uji FTIR menunjukkan kemunculan pita serapan baru C≡C dan C-Cl yang mengindikasikan pembentukan senyawa baru akibat interaksi dengan ion Cl⁻. Penurunan intensitas O-H dan C-O menunjukkan bahwa proses korosi mempengaruhi sifat kimia dan struktur molekuler material. Secara keseluruhan, kombinasi TSA dengan Aluminum Pigmented Epoxy memberikan perlindungan terbaik, meskipun lapisan cacat mengalami degradasi.
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Thermally Sprayed Aluminium (TSA) with an organic coating is used as a duplex system method to protect steel from corrosion in marine environments. However, some degradation occurred after exposure to the marine environment for a short period. This study aims to evaluate the performance of duplex TSA coatings on ASTM A36 steel coated with 99.5% aluminum, followed by various organic coatings such as Mastic Epoxy, Aluminum Pigmented Epoxy, and Glass Flake Epoxy. Samples in both defect-free and defected conditions were tested using the salt spray method (ISO 9227). The results of the macrostructure analysis show that the duplex TSA is able to maintain its integrity after the salt spray test. In the samples with coating defects, sample 1B showed the best protection due to the formation of an Mg(OH)₂ layer that acted as an additional protective layer, while sample 4B had the worst protective performance due to significant degradation and the formation of corrosion bubbles. In defect-free samples, sample 3A showed the best performance with a more homogeneous surface and minimal degradation, while sample 4A showed the worst protection due to surface irregularities and greater degradation. The results of the electrochemical analysis after the salt spray test show that sample 3B has the lowest corrosion rate of 3.01 mm/y and the highest polarization resistance of 535.89 Ω.cm², while sample 4B shows the lowest performance with a corrosion rate of 3.1575 mm/y and a polarization resistance of 199.08 Ω.cm². TSA without an organic coating shows the best corrosion resistance with a corrosion rate of 2.8305 mm/y and a polarization resistance of 571.52 Ω.cm². XRD analysis shows that TSA and the organic layer effectively maintain the crystal structure despite a slight shift in the 2θ angle after the salt spray test. FTIR tests show the appearance of new absorption bands C≡C and C-Cl, indicating the formation of new compounds due to interaction with Cl⁻ ions. The decrease in the intensity of O-H and C-O indicates that the corrosion process affects the chemical properties and molecular structure of the material. Overall, the combination of TSA with Aluminum Pigmented Epoxy provides the best protection, although the defective layer experiences degradation.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | korosi, pelapis organik, sistem duplex, TSA, corrosion, duplex system, organic coating |
| Subjects: | T Technology > T Technology (General) > TA404 Materials--Biodegradation T Technology > TN Mining engineering. Metallurgy > TN775 Aluminum alloys--Metallurgy. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis |
| Depositing User: | Suyono Suyono |
| Date Deposited: | 31 Jan 2025 03:23 |
| Last Modified: | 31 Jan 2025 03:23 |
| URI: | http://repository.its.ac.id/id/eprint/117202 |
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