Е-Публикации
Технически университет - София

Abstract: The inhibitory effect of ethanol extract of bilberry on the corrosion of aluminium alloy EN AW 2024 in 1M HCl was investigated using gravimetric and metallographic methods and the variation of anthocyanin absorption in the studied extract with time was monitored. By statistical processing of the data with the SPSS 25.0 product, the existence of a correlation relationship between the quantities time and the presence of inhibitor on the corrosion rate was investigated. The results showed that bilberry extract exhibited a good inhibitory effect on the corrosion of EN AW 2024 aluminum alloy in 1M hydrochloric acid and with increasing concentration of bilberry extract the inhibitory effect increased.

References

1. P. Trouillas, J. Sancho-García, V. De Freitas, J. Gierschner, M. Otyepka, and O. Dangles, “Stabilizing and Modulating Color by Copigmentation: Insights from Theory and Experiment,” Chem. Rev., vol. 116, pp. 4937–4982, March 2016.
2. N. Pangestu, G. Miyagusuku-Cruzado, and M. M. Giusti, “Copigmentation with Chlorogenic and Ferulic Acid Affected Color and Anthocyanin Stability in Model Beverages Colored with Sambucus peruviana, Sambucus nigra, and Daucus carota during Storage,” Foods, vol. 9, pp.1- 13, October 2020.
3. E. Nikkhah, M. Khayamy, R. Heidari, and R. Jamee, “Effect of sugar treatment on stability of anthocyanin pigments in berries,” J. Biol. Sci, vol. 7, pp. 1412-1417, 2007.
4. P. Markakis, Anthocyanins as food colours. New York, NY: Academic Press, 1982.
5. Y. Li, “Effects of Different Metal Ions on the Stability of Anthocyanins as Indicators”, IOP Conf. Seri. Earth Environ. Sci, vol. 300, pp. 1-6, 2019 [The 18th Food Innovation Asia Conf. Bangkok, 2016].
6. E. V. Maylinda, A. Rinadi, E. Putri, G. Fadillah, and S. Wayuningsih, “Color Stability of Anthocyanins Copigmentation from Red Rice (Oryza sativa L.) Bran by Spectrophotometry UV-Vis,” IOP Conf. Ser. Mater. Sci. Eng, vol. 578, pp. 1-7, 2019 [Int. Conf. Advanced Materials for Better Future Indonesia, 2018].
7. I. Susanti, H. Wijaya, F. Hasanah, and S. Heryani, “Copigmentation Of Anthocyanin Extract of Purple Sweet Potatoes (Ipomea Batatas L.) Using Ferulic Acid and Tannic Acid,” IOP Conf. Ser. Mater. Sci. Eng, vol. 116, pp. 1-7, March 2018 [3rd Int, Conf. on Tropical and Coastal Region Eco Development, Indonesia, 2017].
8. Y. Teng, W. Zhang, M.Wang, Ch. Yu, Y. Ma, J. Bian, X.Yang and D. Zhang, “Anthocyanin as sustainable and non-toxic corrosion inhibitor for mild steel in HCl media: Electrochemical, surface morphology and theoretical investigations,” J. Mol Liq, vol. 344, pp. 1-9, December 2021.

Issue