Analisis Ketahanan Korosi dan Performa Variasi Sistem Pengecatan terhadap Lingkungan KCl

Rifai, Yanuar Ahmad (2026) Analisis Ketahanan Korosi dan Performa Variasi Sistem Pengecatan terhadap Lingkungan KCl. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini ditujukan untuk mengevaluasi ketahanan korosi dan performa dari variasi sistem pengecatan terhadap lingkungan KCl. Sistem pengecatan ini adalah kombinasi multi layer antara Zinc Rich Epoxy sebagai lapisan primer, High Solid Epoxy sebagai lapisan tengah dan Acrylic Polyurethane sebagai lapisan atas. Ketiga generik bahan cat tersebut dikombinasikan menjadi tiga variasi sistem pengecatan untuk kemudian diuji pada lingkungan KCl kering (ditabur pada sampel) dan basah (uji kabut garam ASTM B117) dengan waktu tertentu. Setelah dilakukan pengujian KCl tersebut, variasi sistem pengecatan dievaluasi secara visual sesuai dengan ISO 4628 part 2, 3, 4 dan 5 serta uji adhesi sesuai ASTM D4541 metode B. Karakterisasi dan pengujian yang dilakukan antara lain EIS & Potentiodynamic dengan KCl 5% sebagai elektrolit, SEM-EDX dan FTIR untuk menganalisis gugus fungsi bahan cat. Berdasarkan hasil pengujian pada penelitian ini sistem pengecatan Z yang tersusun oleh Zinc Rich Epoxy sebagai primer, High Solid Epoxy sebagai lapisan tengah dan Acrylic Polyurethane sebagai lapisan atas, memiliki performa dan ketahanan korosi yang sangat baik pada lingkungan KCl kering dan basah. Tidak ada degradasi dan kerusakan dari uji visual, nilai Rp dari uji EIS > 1,00×1010 ꭥ.cm2, laju korosi < 7,10×10-6 mmpy, kuat rekat (adhesi) > 9 MPa dan tidak terdeteksi unsur Fe dari analisis EDX. Berdasarkan observasi SEM tidak ditemukan retakan, rongga yang besar atau tanda kerusakan pada permukaan lapisan cat. Analisis hasil pengujian sistem pengecatan Z membuktikan bahwa perlindungan kompleks dari Zinc Rich Epoxy yang memiliki sifat perlindungan katodik, High Solid Epoxy yang memiliki sifat mekanik yang baik dan Acrylic Polyurethane yang memiliki ketahanan terhadap reaksi korosif mampu memberikan performa dan ketahanan korosi optimal terhadap lingkungan KCl.
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This study is intended to evaluate the corrosion resistance and performance from a painting system variation which mostly applied in the industry with large application volume. This painting system is the multi layer combination between Zinc Rich Epoxy as primer coat, High Solid Epoxy as intermediate coat and Acrylic Polyurethane as the top coat. Those painting generics are combined each other to become three painting systems variation then exposured with KCl under dry (poured over) and wet (salt spray test ASTM B117) condition with specific duration. After KCl exposure, painting system variation will be evaluated for performance analysis by using visual as per ISO 4628 part 2, 3, 4 & 5, and adhesion test as per ASTM D4541 method B. Characterization and examination used were EIS and Potentiodynamic with KCl 5% as electrolyte, SEM-EDX and FTIR to analyze functional group of paint materials. Based on the experimental results in this study, painting system Z constructed from Zinc Rich Epoxy as primer, High Solid Epoxy as intermediate and Acrylic Polyurethane as top coat, has the most outstanding performance and corrosion resistance against dry and wet KCl environment. No degradation and damaged found from visual evaluation, Rp from EIS resulting > 1,00×1010 ꭥ.cm2, corrosion rate < 7,10×10-6 mmpy, adhesion strength > 9 MPa and no Fe detected from EDX analysis. Based on SEM observation there was no crack, large porous or detrimental sign of coating surface. Analysis on examination results for painting system Z proofs that complex protection from Zinc Rich Epoxy as cathodic protection behavior, High Solid Epoxy which has good mechanical properties and Acrylic Polyurethane which has resistance to corrosive reaction are able to provide optimal performance and corrosion resistance against KCl environtment.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Zinc Rich Epoxy, High Solid Epoxy, Acrylic Polyurethane, Performa Lapisan Pengecatan, Ketahanan Korosi Lapisan Pengecatan, Zinc Rich Epoxy, High Solid Epoxy, Acrylic Polyurethane, Painting Performance, Painting Corrosion Resistance
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User:	Yanuar Ahmad Rifai
Date Deposited:	15 Jan 2026 05:48
Last Modified:	15 Jan 2026 05:48
URI:	http://repository.its.ac.id/id/eprint/129648

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