Evaluasi Performa Epoxy Coating Pada Marine Structural Steel Dengan Perbedaan Bentuk Panel

Ramadlon, Rizqi Gilang (2025) Evaluasi Performa Epoxy Coating Pada Marine Structural Steel Dengan Perbedaan Bentuk Panel. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Industri offshore menghadapi tantangan besar dalam mitigasi korosi pada struktur baja yang terpapar lingkungan laut ekstrem. Aplikasi organic coating systems menjadi strategi utama proteksi, tetapi efektivitasnya sangat dipengaruhi oleh kompleksitas geometri permukaan, seperti sambungan las (welded) dan pelat yang dibengkokkan (bended). Penelitian ini mengevaluasi performa polyamine-cured pure epoxy coating (EP1) dan aluminium-pigmented pure epoxy coating (EP2) yang diaplikasikan pada marine structural steel berbentuk plain, welded, dan bended. Permukaan dipersiapkan dengan blasting Sa 2.5 (Ra 86 µm) dan dilapisi epoxy coating dengan rata-rata DFT 600 µm. Paparan buatan mengadaptasi kondisi setara CX–Im4 (pendekatan ISO 12944-9) melalui seawater immersion (adaptasi ISO 2812-2) dan neutral salt spray (adaptasi ISO 9227), disertai scribe line (~50×2 mm). Evaluasi degradasi dilakukan menggunakan pendekatan ISO 4628-8. TGA menunjukkan EP1 mulai terdegradasi pada 238 °C (residu 64%) dan EP2 pada 281 °C (residu 49%). FTIR menunjukkan EP1 memiliki intensitas –OH lebih tinggi (3675 cm⁻¹) dan Si–O lebih tajam (1012 cm⁻¹) dibanding EP2. SEM-EDX menunjukkan integritas interface pada P-EP1 dan B-EP1 (seragam/kompak), W-EP2 mulus, sementara P-EP2, W-EP1, dan B-EP2 memperlihatkan defect mikro. Evaluasi degradasi di sekitar scribe line menunjukkan delaminasi terbesar terjadi pada P-EP1 (2.5 mm) dan W-EP2 (hingga 4.25 mm), sementara B-EP1 dan B-EP2 tidak menunjukkan korosi delaminasi signifikan. Temuan ini menegaskan bahwa bentuk panel dan jenis coating secara sinergis menentukan efektivitas proteksi terhadap korosi.
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The offshore industry faces significant challenges in mitigating corrosion on steel structures exposed to extreme marine environments. The application of organic coating systems has become the primary protection strategy; however, their effectiveness is strongly influenced by surface geometry complexity, such as welded joints and bent plates. This study evaluates the performance of polyamine-cured pure epoxy coating (EP1) and aluminium-pigmented pure epoxy coating (EP2) applied on marine structural steel in plain, welded, and bended configurations. Surface preparation was performed via Sa 2.5 blasting (Ra 86 µm), followed by epoxy coating application with an average dry film thickness (DFT) of 600 µm. Artificial exposure adapted CX–Im4 equivalent conditions (ISO 12944-9 approach) through seawater immersion (ISO 2812-2 adaptation) and neutral salt spray (ISO 9227 adaptation), accompanied by a scribe line (~50×2 mm). Degradation was assessed using the ISO 4628-8 approach. TGA revealed initial degradation at 238 °C (64% residue) for EP1 and 281 °C (49% residue) for EP2. FTIR spectra showed that EP1 had higher –OH intensity (3675 cm⁻¹) and sharper Si–O peaks (1012 cm⁻¹) than EP2. SEM-EDX showed interface integrity on P-EP1 and B-EP1 (uniform/compact), W-EP2 was smooth, while P-EP2, W-EP1, and B-EP2 showed micro defects. Degradation observations around the scribe line revealed the most extensive delamination on P-EP1 (2.5 mm) and W-EP2 (up to 4.25 mm), while B-EP1 and B-EP2 showed no significant corrosion delamination. These findings confirm that both panel geometry and type of coating synergistically determine corrosion protection effectiveness.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bend, Epoxy Coating, Marine Structural Steel, Scribe Line, Weld Joint
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.9.C57 Coatings
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Rizqi Gilang Ramadlon
Date Deposited:	04 Aug 2025 06:54
Last Modified:	04 Aug 2025 06:54
URI:	http://repository.its.ac.id/id/eprint/125759

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