Agustio, Ganesha Galih Piturea (2025) Pengaruh Ph Larutan Dan Penambahan Inhibitor Ekstrak Daun Ketapang Terhadap Korosi Pada Baja Karbon Rendah. Other thesis, Universitas Islam Riau.

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Abstract

Low carbon steel is a type of steel that has a relatively low carbon content, typically less than 0.3% by weight. The main issue with using low carbon steel is corrosion, which can significantly affect its lifespan. One effective method to reduce the rate of corrosion is by adding inhibitors. These inhibitors can be derived from readily available natural materials, such as ketapang leaves. The objective of this study is to investigate the effect of solution pH and the addition of ketapang leaf extract as an inhibitor on the corrosion of low carbon steel. This research utilized ASTM A36 steel with variations in media of HCl at pH 1, HCl at pH 3, and H2O at pH 7, with immersion times of 6 hours, 12 hours, and 912 hours. The concentrations of ketapang leaf extract used as inhibitors were 1000 ppm, 2000 ppm, and 3000 ppm. The results of this study indicate that the inhibitor effectively reduces the corrosion rate, with the highest efficiency observed at a concentration of 3000 ppm, achieving 69.478%. The lowest corrosion rate recorded was during immersion for 912 hours in water with a concentration of 3000 ppm, which was 0.061 mm/y. The corrosion rates for 912 hours of immersion with 2000 ppm and 1000 ppm inhibitors were 0.100 mm/y and 0.122 mm/y, respectively. The corrosion rate at pH 7 was lower compared to pH 1 and pH 3 because, at low pH (with high concentrations of ? +ions), the reduction reaction of ? +ions to hydrogen gas occurs more rapidly, thereby increasing the oxidation reaction of metals to supply electrons for this process, ultimately accelerating the corrosion process.

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