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iPada penelitian ini diterapkan metode penelitian secara eksperimen, yaitu melakukan pengujian perendaman (immersion) di medium korosif air laut pada 4 spesimen pelat hasil las titik yang diberi variasi konsentrasi pengaplikasian inhibitor korosi dari ekstrak propolis sebesar 0 ml, 2 ml, 4 ml, dan 6 ml. Propolis yang digunakan adalah propolis lebah Kele-kele (Trigona Sp.) dari daerah Lombok. Inhibitor berbahan dasar alami dipilih karena sifatnya yang ramah terhadap lingkungan, mudah didapat, dan relatif murah. Hasil dari pengujian laju korosi selama perendaman 14 hari didapat bahwa spesimen dengan konsentrasi inhibitor 2 ml (pada 1000 ml medium air laut) memiliki efesiensi inhibisi tertinggi sebesar 41,046%, kemudian secara berturut-turut diikuti oleh spesimen dengan konsentrasi inhibitor 6 ml sebesar 17,274% dan 4 ml sebesar 16,482%.Kata Kunci : Inhibitor Alami, Propolis, Pengujian Laju Korosi, Kele-Kele, Trigona Sp. ; AbstracttIn this study, an experimental research method was applied, namely conducting immersion testing in seawater corrosive medium on 4 specimens of spot welded plates that were given variations in the concentration of applying corrosion inhibitors from propolis extract by 0 ml, 2 ml, 4 ml, and 6 ml. The propolis used is Kele-kele bee propolis (Trigona Sp.) from Lombok area. Natural-based inhibitor was chosen because it is environmentally friendly, easily available, and relatively inexpensive. The results of corrosion rate testing during 14 days immersion found that specimen with inhibitor concentrations of 2 ml (in 1000 ml seawater medium) had the highest inhibitor efficiency of 41.046%, followed by specimens with inhibitor concentrations of 6 ml of 17.274% and 4 ml of 16.482%.Keywords: Natural-Based Inhibitor, Propolis, Corrosion Rate Testing, Kele-Kele, Trigona Sp. |