INVESTIGASI EKSTRAK KULIT BATANG KAPUK SEBAGAI INHIBITOR KOROSI PADA BESI ASTM A36 DALAM LARUTAN NaCl 5%
Abstrak
Peningkatan perhatian terhadap keberlanjutan dan isu lingkungan dalam bidang korosi logam semakin mendesak seiring dengan tuntutan global terhadap penerapan teknologi ramah lingkungan. Salah satu pendekatan yang banyak digunakan untuk tujuan tersebut adalah pemanfaatan inhibitor berbasis ekstrak tumbuhan karena ketersediaannya melimpah dan proses ekstraksinya relatif mudah. Penelitian ini bertujuan untuk menyelidiki pengaruh variasi konsentrasi inhibitor ekstrak kulit batang kapuk dengan konsentrasi inhibitor 1000, 2000, dan 3000 mg/L terhadap laju korosi baja ASTM A36 dalam larutan NaCl 5%. Kinerja anti korosi dan mekanisme kerjanya diperiksa secara cermat melalui uji potensiodinamik polarisasi (PDP) dan spektroskopi impedansi elektrokimia (EIS). Hasil pengujian menunjukkan bahwa pada konsentrasi 3000 mg/L, ekstrak kulit batang kapuk mampu menurunkan laju reaksi katodik dan anodik secara signifikan. Kondisi tersebut menyebabkan laju korosi menurun dari 1,51 menjadi 0,28 mm/tahun dalam larutan NaCl. Efisiensi penghambatan paling optimal, yaitu 81,61%, dicapai pada penambahan inhibitor dengan konsentrasi 3000 mg/L. Berdasarkan hasil tersebut, ekstrak kulit batang kapuk memiliki potensi signifikan sebagai inhibitor korosi ramah lingkungan untuk besi ASTM A36.
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