BI–SIKIN: REALISASI PEMBUATAN BIOINHIBITOR DARI SILIKA LIMBAH SEKAM PADI DAN EKSTRAK DAUN BELIMBING WULUH SEBAGAI WUJUD KONTRIBUSI MAHASISWA MENYUKSESKAN SDGs 2030

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Ika Jumantika Abdul Kholiq Achmad Syarafuddin As-syirazi Alfian Agustin

Abstract

Indonesia belongs to be a country with a high level of corrosiveness, it causes a high rate of corrosion on objects made of metal. The rice husk is the outermost part of the rice seed which has a silica content of 18-22.3%. Meanwhile, bilimbi leaves have 4–8% tannin content. Silica and tannins can be formulated as raw materials to make environmentally friendly organic inhibitor solutions to reduce corrosion rates. The purpose of this study was to obtain silica from rice husk waste and tannins from bilimbi leaf extract and to produce the bioinhibitor product. This research starts with material preparation, isolation of rice husk silica, extraction of bilimbi leaves, making of a bioinhibitor solution, and lastly testing. The variations of this product are 10, 20, 30, 40, and 50 ppm, and had been tested by FTIR analysis, SEM, XRD, tannin analysis, and weight loss tests. The result is the highest corrosion rate in mild steel samples was 119.9893843 mpy with a bioinhibitor of 10 ppm, and the lowest corrosion rate was 19.99823071 mpy with a bioinhibitor of 50 ppm. The highest inhibition efficiency was 92.62 % with 50 ppm bioinhibitor and immersion at an interval of 9 hours for 36 hours, and the lowest was 57.14% with 10 ppm bioinhibitor and 3 hours of soaking time for 12 hours. The conclusion is greater the concentration of silica and tannins contained in the bioinhibitor, the more the inhibitory efficiency of mild steel will increase.

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References

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