Studi Pengaruh Coating Vinyl dan Zinc Terhadap Serangan Korosi Baja di Media Amonium Sulfat

Putra, Anselmus Yesa Dewanta (2024) Studi Pengaruh Coating Vinyl dan Zinc Terhadap Serangan Korosi Baja di Media Amonium Sulfat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Baja ASTM A36 merupakan material yang masih digunakan untuk konstruksi terutama pada industri karena murah, kuat dan tangguh. Namun, baja jenis ini memiliki ketahanan korosi yang lemah apalagi bila diaplikasikan di lingkungan korosif. Oleh karena itu, diperlukan upaya untuk menghambat korosi pada baja ASTM A36, salah satunya adalah dengan metode coating. Pemilihan coating menggunakan vinyl yang diklaim memiliki ketahanan kimia yang baik. Sedangkan, zinc diklaim memiliki ketahanan salt yang baik. Penelitian ini berfokus pada baja ASTM A36 yang dilapisi dengan coating vinyl menggunakan metode airless spray dan coating zinc melalui hot dip galvanizing. Spesimen diuji dalam lingkungan simulasi menggunakan alat uji salt spray sesuai standar ASTM B-117 dengan larutan amonium sulfat 0,35% dan NaCl 0,05% selama 168 jam sesuai standar ASTM G85. Larutan NaCl digunakan untuk mensimulasikan kondisi korosi ringan, sementara ammonium sulfat mencerminkan tingkat polutan industri. Evaluasi mencakup observasi visual sebelum dan sesudah pengujian, pengukuran ketebalan coating, penilaian rating korosi pada area goresan, Scan Electron Microscope (SEM), dan X-Ray Diffraction (XRD). Hasil penelitian menunjukkan bahwa coating zinc lebih unggul dibandingkan coating vinyl dalam hal ketahanan terhadap korosi. Hal ini dibuktikan melalui observasi visual spesimen sebelum dan sesudah uji salt spray, dimana didapatkan rata-rata nilai rating korosi coating zinc sebesar 10 setelah pengujian 168 jam, sedangkan, coating vinyl bernilai sebesar 7,53. Coating zinc, yang diaplikasikan melalui hot dip galvanizing, menunjukkan ketahanan korosi dan perlindungan katodik yang superior, meskipun proses aplikasinya lebih kompleks dan ketebalan lapisan tidak selalu merata. Sebaliknya, coating vinyl lebih mudah diaplikasikan dan efektif dalam lingkungan kimia tertentu, tetapi kurang tahan terhadap abrasi dan tidak memberikan perlindungan katodik.
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ASTM A36 steel remains a widely used material in construction, particularly in the industrial sector, due to its affordability, strength, and toughness. However, this type of steel has poor corrosion resistance, especially when applied in corrosive environments. Therefore, efforts to inhibit corrosion on ASTM A36 steel are necessary, one of which is through coating methods. Vinyl coatings are chosen for their claimed good chemical resistance, while zinc coatings are known for their excellent salt resistance.
This study focuses on ASTM A36 steel coated with vinyl using the airless spray method and zinc coating applied through hot-dip galvanizing. The specimens were tested in a simulated environment using a salt spray test apparatus according to ASTM B-117 standards, with an ammonium sulfate solution at 0.35% and NaCl at 0.05% for 168 hours, in line with ASTM G85 standards. The NaCl solution was used to simulate mild corrosive conditions, while ammonium sulfate represented industrial pollutant levels. The evaluation included visual observation before and after testing, coating thickness measurement, corrosion rating assessment on scratched areas, Scanning Electron Microscope (SEM) analysis, and X-Ray Diffraction (XRD). The results of the study showed that the zinc coating outperformed the vinyl coating in terms of corrosion resistance. This was demonstrated through the visual observation of the specimens before and after the salt spray test, where the average corrosion rating for the zinc coating was 10 after 168 hours of testing, while the vinyl coating received a rating of 7.53. The zinc coating, applied through hot-dip galvanizing, exhibited superior corrosion resistance and cathodic protection, although its application process is more complex and the coating thickness is not always uniform. In contrast, the vinyl coating is easier to apply and effective in certain chemical environments, but it is less resistant to abrasion and does not provide cathodic protection.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baja, Coating, Korosi Atmosfer, Salt Spray Test, Vinyl Coating, Zinc Coating, Atmospheric Corrosion, Corrosion, Steel
Subjects:	T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Anselmus Yesa Dewanta Putra
Date Deposited:	21 Aug 2024 01:11
Last Modified:	21 Aug 2024 01:11
URI:	http://repository.its.ac.id/id/eprint/113563

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