Pengaruh Variasi Material Abrasif Sandblasting terhadap Kekuatan Adhesi dan Laju Korosi Lapisan Thermal Spray Aluminium pada Baja ASTM A36

Abstract

Struktur lepas pantai dari baja karbon sangat rentan terhadap korosi di lingkungan laut. Thermal spray aluminium (TSA) merupakan metode pelapisan yang memberikan perlindungan korosi melalui mekanisme barrier dan perlindungan katodik. Penelitian ini bertujuan mengevaluasi pengaruh variasi material abrasif sandblasting terhadap kekuatan adhesi dan laju korosi lapisan TSA pada baja ASTM A36. Material abrasif yang digunakan adalah pasir garnet (30 mesh dan 60 mesh), steel grit (40 mesh), dan aluminium oxide (16 mesh). Sandblasting dilakukan hingga tingkat kebersihan Sa 2½, kemudian diaplikasikan lapisan TSA dengan ketebalan 200–400 μm. Pengujian meliputi kekuatan adhesi, laju korosi, uji tekuk, dan pengamatan struktur mikro. Hasil menunjukkan steel grit menghasilkan kekasaran tertinggi (79,5 μm), sementara pasir garnet menghasilkan kekuatan adhesi tertinggi (17,92 MPa) namun menunjukkan laju korosi tertinggi (3,9429 mm/tahun) yang diindikasikan berkorelasi dengan tingginya nilai konduktivitas akibat residu garam terlarut pada permukaan. Laju korosi terendah diperoleh pada spesimen steel grit (0,9394 mm/tahun).

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Issue

Vol. 11 No. 1 (2026): J-Proteksion

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