Analisis Efektivitas Lapisan Epoxy terhadap Daya Rekat (Adhesi) dan Ketahanan Benturan (Impact resistance) pada Baja ASTM A36 dengan 3 Variasi Derajat Kebersihan Area Permukaan

*Bintang Fathrama Tuah  -  Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro, Indonesia
Untung Budiarto  -  , Indonesia
Parlindungan Manik  -  , Indonesia

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Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh tingkat kebersihan permukaan hasil abrasive blasting terhadap kekuatan adhesi dan ketahanan impak pelapis epoksi pada baja ASTM A36. Tiga tingkat kebersihan permukaan, yaitu SA 1, SA 2, dan SA 2½, dipersiapkan menggunakan metode dry abrasive blasting sesuai dengan standar ISO 8501-1. Sistem pelapis epoksi diaplikasikan menggunakan metode spray coating dengan ketebalan lapisan kering (dry film thickness) yang dikendalikan sekitar 125 µm. Kekasaran permukaan diukur menggunakan surface profile gauge, kekuatan adhesi dievaluasi melalui uji pull-off sesuai ASTM D4541, sedangkan ketahanan impak diuji berdasarkan ASTM D2794. Hasil penelitian menunjukkan bahwa peningkatan tingkat kebersihan permukaan meningkatkan rata-rata kekasaran permukaan dari 40,00 µm pada SA 1 menjadi 67,67 µm pada SA 2½. Rata-rata kekuatan adhesi juga meningkat dari 9,92 MPa menjadi 12,29 MPa. Hasil uji impak menunjukkan bahwa spesimen dengan tingkat kebersihan SA 2½ memiliki integritas lapisan terbaik terhadap pembebanan impak, yang ditunjukkan oleh retak yang lebih ringan pada energi impak tertinggi sebesar 7,2 J dibandingkan dengan SA 1 dan SA 2. Temuan ini menunjukkan bahwa peningkatan tingkat kebersihan dan kekasaran permukaan mampu meningkatkan mekanisme mechanical interlocking antara pelapis epoksi dan substrat baja, sehingga meningkatkan kekuatan adhesi dan ketahanan impak. Hasil penelitian ini menegaskan pentingnya persiapan permukaan yang tepat untuk meningkatkan keandalan sistem pelapis epoksi pada   struktur baja di lingkungan maritim.

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Analisis Efektivitas Lapisan Epoxy terhadap Daya Rekat (Adhesi) dan Ketahanan Benturan (Impact resistance) pada Baja ASTM A36 dengan 3 Variasi Derajat Kebersihan Area Permukaan
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Keywords: Epoxy coating; surface cleanliness; baja ASTM A36; kekuatan adhesi; ketahanan impak.
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