Russian-Tajik Slavonic University, Department of Chemistry and Biology, Dushanbe, Tajikistan:

I. N. Ganiev, Professor, Doctor of Chemical Sciences
P. N. Abdukholikova, Head of Laboratory
A. E. Berdiev, Head of Department, Doctor of Technical Sciences, Associate Professor, e-mail: berdiev75@mail.ru
S. D. Alikhonova, Senior Lecturer, Candidate of Chemical Sciences, e-mail: thuraya86@inbox.ru

Zinc-aluminium alloys find a wide application in different industries. Approximately half of the produced zinc is used as corrosion protection coatings for steel structures. Corrosion resistance is one of the essential properties of zinc alloys as well. Zinc alloys are highly resistant to atmospheric and marine corrosion, as well as basic and acidic solutions. They have low density and are easily workable by cutting. As is well-known, lead serves as the main concomitant metal for metallic zinc, and its concentration may reach 2.5 wt. % (for TsZ grade of zinc). This research is aimed at designing a new alloy on the basis of zinc alloy TsAM 4-1, which is obtained from a low zinc grade TsZ labelled as TsAMSv4-1-2,5. The alloys were analyzed following potentiostatic technique in a potentiodynamic mode at the potential sweep rate of 2 mV/s in NaCl electrolyte on the pulse potentiostat PI-50-1.1. The TsAMSv4-1-2,5 alloy was doped with 0.05–1.0 wt. % of metallic indium. It was found that as the chloride ion concentration in NaCl electrolyte rises, the free corrosion, pitting and repassivation potentials tend to shift in the negative region while the corrosion rate increases by 28%. It is shown that indium additions cause a 10% drop in the corrosion rate while the alloys’ electrochemical potentials tend to shift in the positive region. Due to increased corrosion resistance of the zinc alloy TsAMSv4-1-2,5 doped with indium, one can save 10% of metal and thus achieve a more cost-effective production of zinc alloy items.

1. Kılınççeker G., Doğan T. The influences of glucose on corrosion behaviour of copper in chloride solution. Protection of Metals and Physical Chemistry of Surfaces. 2016. Vol. 52. pp. 910–920.
2. Muller C., Sarret M., Benballa M. Some peculiarities in the codeposition of zinc – nickel alloys. Electrochimica Acta. 2001. No. 46, Iss. 18. pp. 2811– 2817.
3. Rajappa S. K, Venkatesha T. V., Praveen B. M. Chemical treatment of zinc surface and its corrosion inhibition studies. Bulletin of Materials Science. 2008. Vol. 31, No. 1. pp. 37–41.
4. Dutra A. M., Corado E. N., Nakazaso. R. Z. Electrochemical Behavior and Corrosion Study of Electrodeposits of Zn and Zn – Fe – Co on Steel. Materials Sciences and Applications. 2012. Vol. 3, No. 6. pp. 348–354.
5. Myeong H. L., Yeon W. K., Kyung M. L., Seung H. L., Kyung M. M. Electrochemical evaluation of zinc and magnesium alloy coatings deposited on electrogalvanized steel by PVD. Transactions of Nonferrous Metals Society of China. 2013. Vol. 23. pp. 876–880.
6. Obidov Z. R., Ganiev I. N. The physico-chemical properties of aluminium alloys containing rare earth metals. Dushanbe : Andaleb R, 2015. 334 p.
7. Ganiev I. N., Berdiev A. E., Aminova N. A., Alikhonova S. D. The anticorrosion performance of TsAMSv4-1-2,5 alloy based coatings enhanced by strontium doping. Omsk Scientific Bulletin. 2020. No. 3. pp. 9–13.
8. Ponomareva A. A., Puchkov B. I. Current status of the international zinc processing industry. Moscow : Tsvetmetinformatsiya, 1977. 51 p.
9. Kechin V. A., Lyublinskiy E. Ya. Zinc alloys. Moscow : Metallurgiya, 1986. 247 p.
10. Garifullin F. A., Fetisov G. P. The science and technology of metals. Moscow : Oniks, 2009. 624 p.
11. Semenova I. V., Florianovich G. M., Khoroshilov A. V. Corrosion and anticorrosion protection: Learner’s guide. Moscow : Fizmatlit, 2010. 416 p.
12. Heidersbach R. Metallurgy and Corrosion Control in Oil and Gas Production. Vologda : Infra-Inzheneriya, 2014. 416 p.
13. Shevchenko A. A. Chemical resistance of nonmetallic materials and corrosion protection. Moscow : Kolos, 2006. 248 p.
14. GOST 19424–97. Cast zinc alloys in pigs. Specifications. Introduced: 01.07.2001.
15. GOST 11069–2001. Primary aluminium. Grades. Introduced: 01.01.2003.
16. GOST 10297–94. Indium. Specifications. Introduced: 01.01.1997.
17. Ganiev I. N., Berdiev A. E., Aminova N. A., Alikhonova S. D. Effect of barium additions on the thermophysical and thermodynamic properties of zinc alloy TsAMSv4-1-2,5. Tsvetnye Metally. 2021. No. 12. pp. 53–58. DOI: 10.17580/tsm. 2021.12.08.
18. Ganiev I. N., Aliev J. N., Narzulloev Z. F. Effect of nickel additions on the anode behavior of nickel doped Zn5Al and Zn55Al alloys in NaCl medium. Zhurnal prikladnoy khimii. 2019. Vol. 92, Iss. 11. pp. 1420–1426.
19. Shluger M. A., Azhogin F. F., Efimov E. A. Corrosion and protection of metals. Moscow : Metallurgiya, 1981. 216 p.
20. Mattsson E. Corrosion: An electrochemical problem. Translated from Swedish. Ed. by Ya. M. Kolotyrkin. Moscow : Metallurgiya, 1991. 156 p.