PENGARUH PENAMBAHAN OLEORESIN KERUING PADA CAIRAN PENDINGIN TERHADAP LAJU KOROSI RADIATOR ALUMUNIUM
The Effect Of The Addition Of Keruing Oleoresin To The Coolant On The Corrosion Rate Of Aluminum Radiators
DOI:
https://doi.org/10.46964/mjibtm.v19i1.1828Keywords:
Oleoresin Keruing, Cairan Pendingin, Korosi, Radiator Aluminium, Elektrokimia, PotensiodinamikAbstract
Penelitian ini mengkaji pengaruh penambahan oleoresin keruing (Dipterocarpus grandiflorus) ke dalam aquadest terhadap laju korosi material radiator aluminium. Spesimen aluminium radiator diuji dalam enam media, yaitu aquadest, coolant komersial, serta aquadest dengan penambahan oleoresin keruing 2,5%; 5%; 7,5%; dan 10%. Pengujian dilakukan menggunakan metode polarisasi elektrokimia berbasis ekstrapolasi Tafel dengan data rapat arus korosi (Icorr) yang kemudian dikonversi menjadi laju korosi menggunakan persamaan Faraday. Hasil menunjukkan bahwa laju korosi terendah diperoleh pada aquadest sebesar 0,299 mmpy, sedangkan coolant menghasilkan laju korosi tertinggi sebesar 8,716 mmpy. Pada media aquadest-oleoresin, nilai terendah diperoleh pada konsentrasi 7,5% sebesar 0,318 mmpy, diikuti 2,5% sebesar 0,545 mmpy, 5% sebesar 1,337 mmpy, dan 10% sebesar 2,336 mmpy. Secara relatif, penambahan oleoresin pada aquadest belum menurunkan laju korosi di bawah aquadest murni, tetapi variasi 7,5% menunjukkan performa paling stabil di antara media oleoresin. Temuan ini menunjukkan bahwa oleoresin keruing berpotensi dikembangkan sebagai kandidat aditif hijau, namun formulasi, dispersi, pH, temperatur, dan validasi berulang perlu dikontrol sebelum diaplikasikan sebagai inhibitor cairan pendingin radiator
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