Analisis Korosi Baja Galvalum 55% Al-Zn Berlapis Resin Pigmen Berwarna pada Media Beton K200 dan K300 dengan Perlakuan Dry dan Wet-Dry Cycle

Hidayat, Ahyaa Firlii (2025) Analisis Korosi Baja Galvalum 55% Al-Zn Berlapis Resin Pigmen Berwarna pada Media Beton K200 dan K300 dengan Perlakuan Dry dan Wet-Dry Cycle. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mengevaluasi perilaku korosi baja galvalum 55% Al-Zn yang dilapisi resin kopolimer stirena-akrilat berwarna hitam ketika dicor ke dalam beton dengan komposisi K200 dan K300. Pengujian dilakukan untuk meninjau pengaruh komposisi beton terhadap laju korosi dan mekanisme pelindung permukaan pada dua kondisi lingkungan, yaitu dry (pengeringan tambahan) dan wet-dry cycle, selama total 43 hari pemaparan. Proses evaluasi dilakukan melalui metode pengurangan massa mengacu pada ASTM G31-72, didukung dengan karakterisasi permukaan menggunakan X-Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive X-ray (SEM–EDX), dan Fourier Transform Infrared Spectroscopy (FTIR). Hasil menunjukkan bahwa beton K200 yang lebih berpori menyebabkan penetrasi ion Cl⁻ lebih besar, mempercepat pembentukan produk korosi seperti Zn(OH)₂, ZnO, dan Zn₅(OH)₈Cl₂·H₂O. Sebaliknya, beton K300 yang memiliki densitas lebih tinggi terbukti lebih mampu menghambat difusi ion agresif dan menjaga kestabilan antarmuka logam-beton. Analisis EDX menunjukkan dominasi lapisan pelindung Al₂O₃ pada beton K200 dalam kondisi dry, sedangkan pada beton K300 teridentifikasi pembentukan lapisan pelindung sekunder berupa calcium-hydroxy zincate (Ca(Zn(OH)₃)₂·2H₂O) yang terbentuk dari reaksi antara ion Ca²⁺ dan spesies Zn selama curing. Pada kondisi wet-dry, kandungan Zn lebih dominan pada K300 akibat degradasi Al₂O₃, yang berpotensi membentuk produk korosi seperti simonkolleite. Secara keseluruhan, beton K300 memberikan perlindungan korosi yang lebih stabil selama lapisan pelindungnya masih bertahan, sementara beton K200 lebih rentan terhadap penetrasi ion agresif meski awalnya mempertahankan lapisan pasif.
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This study aims to evaluate the corrosion behavior of 55% Al-Zn galvalume steel coated with black-colored styrene-acrylate copolymer resin when embedded in concrete compositions K200 and K300. The test was conducted to assess the influence of concrete composition on the corrosion rate and surface protection mechanism under two environmental conditions, namely dry (extended drying) and wet-dry cycle, over a total exposure period of 43 days. Evaluation was carried out using the weight loss method based on ASTM G31-72, supported by surface characterization through X-Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive X-ray (SEM–EDX), and Fourier Transform Infrared Spectroscopy (FTIR). The results showed that the more porous K200 concrete allowed greater penetration of Cl⁻ ions, accelerating the formation of corrosion products such as Zn(OH)₂, ZnO, and Zn₅(OH)₈Cl₂·H₂O. In contrast, K300 concrete with higher density was more effective in inhibiting the diffusion of aggressive ions and maintaining interfacial stability between the metal and concrete. EDX analysis indicated that the passive Al₂O₃ layer remained dominant in K200 under dry conditions, while in K300, a secondary protective layer of calcium-hydroxy zincate (Ca(Zn(OH)₃)₂·2H₂O) was identified, formed through reactions between Ca²⁺ ions and Zn species during the curing process. Under wet-dry cycles, the Zn content increased in K300 due to Al₂O₃ degradation, leading to the potential formation of corrosion products such as simonkolleite. Overall, K300 concrete provided more stable corrosion protection as long as the protective layers remained intact, whereas K200 was more susceptible to chloride ion penetration despite initially retaining a passive layer.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baja Galvalum, Korosi, Beton, Resin Berwarna, Wet-Dry Cycle
Subjects:	T Technology > T Technology (General) > TA404 Materials--Biodegradation T Technology > TH Building construction > TH1461 Concrete construction. T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Ahyaa Firlii Hidayat
Date Deposited:	30 Jul 2025 10:03
Last Modified:	30 Jul 2025 10:03
URI:	http://repository.its.ac.id/id/eprint/124202

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