¬¬PEMANFAATAN EKSTRAK BUAH Psidium Guajava  SEBAGAI GREEN INHIBITOR UNTUK KOROSI BESI PADA LARUTAN ASAM SULFAT

Said Ali Akbar

Said Ali Akbar Departemen Pendidikan Kimia, Universitas Serambi Mekkah, Aceh, 23245, Indonesia

Abstract

ABSTRAK: Efek inhibisi dari ekstrak buah Psidium Guajava (PG) pada korosi logam besi dipelajari dengan menggunakan metode penurunan berat. Laju korosi besi dalam media PG-H₂SO₄ berkurang secara relatif terhadap media larutan H₂SO₄ tanpa PG. Efisiensi inhibisi meningkat dengan semakin banyaknya konsentrasi ekstrak dan serta kenaikan suhu. Efisiensi inhibisi tertinggi tercatat 83,63% pada konsentrasi ekstrak 10 g/L pada 60 °C. Energi aktivasi (E_a) korosi besi dalam medium PG-H₂SO₄ lebih rendah dari pada tanpa PG. Parameter termodinamika yang telah dihitung menunjukkan bahwa proses inhibisi korosi adalah endotermik dan spontan. Adsorpsi PG pada permukaan besi sesuai dengan model adsorpsi isoterm Langmuir.

Kata Kunci : asam sulfat, green inhibitor, isoterm langmuir, Psidium Guajava

ABSTRACT: The inhibitory effect of Psidium Guajava (PG) fruit extract on iron metal corrosion was studied using the weight loss method. The corrosion rate of iron in the PG-H₂SO₄ medium was reduced relative to the medium of H₂SO₄ without PG. The inhibition efficiency increases with increasing concentration of extracts and increases in temperature. The highest inhibition efficiency was 83.63% at an extract concentration of 10 g/L at 60 °C. The activation energy (E_a) iron corrosion in the PG-H₂SO₄ medium was lower than without PG. Thermodynamic parameters that have been calculated, indicating the corrosion inhibition processes are endothermic and spontaneous. The adsorption of PG on the iron surface was accordance with the Langmuir isotherm adsorption model.

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