Abstract
Extract of trembesi leafs consist tannins compound that can reducing corrosion rate. This studey was to examine the efficiency of trembesi leaf extract as a inhibitors of corrosion rate. In this study, carbon steel metal was used as an immersion object in 10% HCl solution as a corrosion medium. Trembesi leaf extract were added in the corrosive medium with variations in volumes of 3, 6, 9, 12 mL with carbon steel immersion for 14 days. Corrosion rate was calculated using the weight loss method. The results shows, the lowest corrosion rate was obtained in the addition of 9 mL inhibitor concentration of 0.008989 cm/year and the highest corrosion rate was without the addition of an inhibitor of 0.011669 cm/year. The highest inhibitor efficiency value was 22.97% with the addition of 9 mL.
Highlights
Extract of trembesi leafs consist tannins compound that can reducing corrosion rate
The results shows, the lowest corrosion rate was obtained in the addition of 9 mL inhibitor concentration of 0.008989 cm/year, while the highest corrosion rate was without the addition of an inhibitor of 0.011669 cm/year
Pengaruh waktu perendaman dan konsentrasi ekstrak daun jambu biji (Psidium guajava, Linn) sebagai inhibitor terhadap laju korosi baja SS 304 dalam larutan garam dan asam
Summary
Korosi adalah proses elektrokimia pada logam yang dapat merusak struktur akibat adanya interaksi dengan lingkungan yang bersifat korosif. Inhibitor anorganik terbuat dari mineral-mineral sebagai material dasar seperti nitrit, kromat, silikat, dan fosfat.[3] Inhibitor anorganik memiliki harga yang mahal dan tidak ramah lingkungan.[2] Oleh karena itu, dikembangkan inhibitor sintetis untuk menggantikan inhibitor anorganik seperti HBTT, DHBTPH, BMIC, dan PEGME.[4] Akan tetapi, inhibitor sintetis ini masih memiliki harga yang cukup mahal dan tidak ramah lingkungan.[5] Disisi lain, inhibitor organik saat ini banyak digunakan dengan menggunakan ekstrak bahan organik seperti Sargassum sp., Gracilaria sp., Salvia officinalis, kulit buah markisa, daun trembesi, dan daun ceremai. Nilai pH sangat mempengaruhi efisiensi inhibitor yang digunakan.[2] Oleh karena itu, tujuan penelitian yaitu menguji efisiensi inhibitor korosi dari ekstrak daun trembesi pada logam baja karbon dengan menggunakan medium korosi HCl
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