Abstract
Utilization of mangosteen rind extract as carbon steel inhibitors in the environment of hydrochloric acid (HCl) 0.1M, 0.5M, and 1.0M. Extracts were carried out by extraction using ethanol solvent at a temperature of 600C with a time of 80 minutes. The variation of extract concentration (100 ppm to 1000 ppm in 3 days and the effect of time of corroding the carbon steel with the addition of 1000 ppm extract. Corrosion rate is calculated based on the difference in weight and corrosion products shown by microscope optics. The objective was investigated corrosion inhibition efficiency that could be prevented by mangosteen peel extract as inhibitor. The results showed inhibitory properties of mangosteen peel extract for three (3) days increased with increasing extract concentrations up to 76.53% in 0.1M HCl solution and 28.83% in 1.0M HCl solutions. For the addition of 1000 ppm mangosteen peel extract showed inhibitor efficiency reached about 90% at 3 days of corrosive time in HCl 0, 5 M, 87% in 1.0 M HCl solution, and 81% in 0.1 M HCl solution. The experiment showed that the process of diffusion of compounds in extracts on the surface of carbon steel and react with ferro ions (Fe2 +) to form chemical covalent coordination coordinate with a thickness of 76 µm was successfully done.
Highlights
Mangosteen rind extract produced 6 xanthon derivatives (Shan et al, 2011)
Xanthones are kind of organic compound, in phenol compounds that are found in very high concentrations in the skin of mangosteen (Garcinia mangostana)
That in this study focused on the mechanism of inhibition of corrosion by inhibitors and how far the efficiency of corrosion inhibition that can be prevented by inhibitors of mangosteen peel extract results in hydrochloric acid environment (0.1M, 0.5M and 1.0M)
Summary
Mangosteen rind extract produced 6 xanthon derivatives (Shan et al, 2011). Xanthones are kind of organic compound, in phenol compounds that are found in very high concentrations in the skin of mangosteen (Garcinia mangostana). Xanthon compounds are antioxidants found in mangosteen peel with high levels and have good and beneficial properties for the body, such as anti-inflammation, anti-diabetes, anti- cancer, anti-bacterial, anti-fungal, anti-plasmodial, and able to increase immunity (Miryanti et al, 2011). Components that contribute to the brown-purple color of mangosteen peel are pigments called anthocyanins such as cyanidin-3sophoroside and cyanidin-3-glucoside (Kaewsukseng et al, 2019). To extract the compounds contained in the mangosteen rind extraction process is carried out using ethanol (96%) (Ulfah and Karsa, 2007). Solvents can be recycled and their waste or raffinate can be used as plant fertilizer
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