When choosing metal packaging for canned vegetables, it is advisable to take into account their corrosivity, because the inner surface corrosion is one of the factors affecting product quality during storage. To rationalize the corrosion tests of metal packaging materials, it is advisable to replace food with model media – organic acids solutions. The aim of this work was to study the corrosion kinetics of electrolytic tinplate in model media–aqueous solutions of oxalic (mass fraction 0.25–1.00%) and citric (mass fraction 0.25–1.50%) acids, as well as their compositions. The uniform corrosion rate was measured by the linear polarization resistance method, pitting corrosion–zero resistance amperometry method. The tests were carried out using the “Expert-004” corrosion-meter, according to a two-electrode scheme. For oxalic acid solutions with a mass fraction of 0.25% and 0.50% and for all citric acid solutions, the process is characterized as uniform corrosion – the pitting corrosion rates average steady values are 7–11 times less than the corresponding uniform corrosion rates values (1.52–3.93 µm/year and 17.42–26.56 µm/year, respectively). The most aggressive with respect to tinplate are oxalic acid solutions with a mass fraction of 0.25 and 0.50% and citric acid solutions with a mass fraction of 0.25 and 0.50%. On this basis, two-component solutions of the following composition were chosen: 0.25% citric acid + 0.25% oxalic acid; 0.25% citric acid + 0.50% oxalic acid; 0.50% citric acid + 0.25% oxalic acid; 0.50% citric acid + 0.50% oxalic acid. For these solutions, the process is characterized as uniform corrosion — the pitting corrosion rates average steady values are 7–10 times less than the corresponding the uniform corrosion rates values (2.04–3.85 ?m/year and 19.56–26.93 ?m/year, respectively). For two-component solutions, an additive effect is observed–the uniform and pitting corrosion rates average experimental steady values correspond to the calculated additive values. By mathematical processing of experimental data, it was found that the uniform corrosion steady rate maximum value the corresponds to a two-component solution containing 0.40% citric acid and 0.30% oxalic acid. This is confirmed by experimental data–the uniform corrosion rate average steady value for this solution is 28.18 ?m/year. According to the research results it was found that as a model corrosive medium that simulates canned vegetables, it is advisable to use a solution containing 0.40% citric acid and 0.30% oxalic acid, because it is the most aggressive.

model medium, oxalic acid, citric acid, electrolytic tinplate, corrosion rate, polarization resistance method, zero resistance amperometry method, “Expert-004” corrosion-meter, canned food.

1. Semyonova I.V., Florianovich G.M., Horoshilov A.V. Korroziya i zashhita ot korrozii [Corrosion and corrosion protection]. Moscow, Fizmatlit, 2010. 416 p. (in Russian).

2. Abdel-Rahman N.A.-G. Tin-plate Сorrosion in Canned Foods. Journal of Global Biosciences. 2015. vol. 4. no. 7. pp. 2966–2971.

3. Andryushhenko E.A., Tovstokora N.S. Classification of fruit juices and compotes by the degree of their corrosivity. Pishhevaya promyshlennost' [Food industry]. 1986. no. 11. pp. 48–49. (in Russian).

4. Shavyrin V.A., Tovstokora N.S., Chavchanidze A.Sh., Timofeeva N.Yu. et al. Correlation between a scale of one to ten for corrosion resistance metallic packing materials and classification of canned food ranking in terms of its corrosion activity. Praktika protivokorrozionnoj zashhity [Practice anti-corrosion protection]. 2011. no. 1. pp. 56–60. (in Russian).

5. Salt F.W., Thomas J.G.N. The anaerobic corrosion of tin in anthocyanin solutions and fruit syrups. Journal of Applied Chemistry. 1957. vol. 7. no. 5. pp. 231–238. doi: 10.1002/jctb.5010070504

6. Platonova T.F., Bessarab O.V. Investigation of corrosion interaction of electrolytic tinplate with water solutions of organic acids containing anthoician pigments. Pishhevaya promyshlennost' [Food Industry]. 2018. no. 12. pp. 77–79. (in Russian).

7. Haruna K., Obot I.B., Ankah N.K., Sorour A.A. et al. Gelatin: A green corrosion inhibitor for carbon steel in oil well acidizing environment. Journal of Molecular Liquids. 2018. vol. 264. pp. 515–525. doi: 10.1016/j.molliq.2018.05.058

8. Bessarab O.V., Platonova T.F. Usage of food additives for improvement the quality and safety of fruit canned food in metallic packaging. Vestnik VGUIT [Proceedings of VSUET]. 2018. vol. 80. no. 3 (77). pp. 170–175. doi: 10.20914/2310–1202–2018–3–170–175 (in Russian).

9. Che Y., Han Z., Luo B., Xia D. et al. Corrosion Mechanism Differences of Tinplate in Aerated and Deaerated Citric Acid Solution. International Journal Of Electrochemical Science. 2012. vol. 7. pp. 9997–10007.

10. Abdel-Moemin A.R. Oxalate Content of Egyptian Grown Fruits and Vegetables and Daily Common Herbs. Journal of Food Research. 2014. vol. 3. no. 3. pp. 66–77. doi:10.5539/jfr.v3n3p66

11. Nechaev A.P., Traubenberg S.E., Kochetkova A.A., Kolpakova V.V. et al. Pishhevaya khimiya [Food Chemistry]. St. Petersburg, GIORD, 2015. 672 p. (in Russian).

12. Anufriev N.G. Application of polarization resistance and zero-resistance amperometria methods for investigation of corrosion metal conduct in water media. Praktika protivokorrozionnoj zashhity [Practice anti-corrosion protection]. 2003. no. 4. pp. 10–13. (in Russian).

13. Chavchanidze A.Sh., Rakoch A.G., Timofeeva N.Yu., Bazarkin A.Yu. Electrochemical studies of the corrosion resistance of metallic materials in food environments. Korroziya: materialy i zashhita [Corrosion: materials and protection]. 2008. no. 12. pp. 10–16. (in Russian).

14. Anufriev N.G. New possibilities of applying the method of linear polarization resistance in corrosion studies and in practice. Korroziya: materialy i zashhita [Corrosion: materials, protection]. 2012. no. 1. pp. 36–43. (in Russian).

15. Andryushhenko E.A. et al. Evaluation of corrosiveness of canning media by the method of polarization resistance. Zashhita metallov [Protection of metals]. 1987. vol. 23. no. 5. pp. 862–865. (in Russian).

16. Shavyrin V.A., Bazarkin A.Yu., Chavchanidze A.Sh., Timofeeva N.Yu. Express method of corrosion testing of cans. Produkty dlitel'nogo khraneniya [Durable storage products]. 2009. no. 3. pp. 12–14. (in Russian).

17. Shejxet F.I. Materialovedenie khimikatov, krasitelej i moyushhikh sredstv [Materials science of chemicals, dyes and detergents]. Moscow, Legkaya industriya, 1969. 324 p. (in Russian).

18. Semyonova M.G., Kornev V.I. Complex compounds of cobalt(II) and nickel(II) in aqueous oxalic acid solutions. Khimicheskaya fizika i mezoskopiya [Chemical Physics and Mesoscopy]. 2010. vol. 12. no. 1. pp. 131–138. (in Russian).

19. Kharakternye i spetsificheskie reaktsii kationov olova. Portal meditsinskikh lektsij [Characteristic and specific reactions of tin cations. Medical Lectures Portal]. Available at: https://medlec.org/lek2–50007.html (in Russian).

20. Seleznev K.A. Аnaliticheskaya khimiya. Kachestvennyj polumikroanaliz i kolichestvennyj analiz [Analytical chemistry. Qualitative semi-microanalysis and quantitative analysis]. Moscow, Vysshaya shkola, 1973. 246 p. (in Russian).

21. Kvaraczxeliya R.K., Kvaraczxeliya E.R. About the dissociation of weak two-and tribasic organic acids involved in the Krebs cycle. Ehlektrokhimiya [Electrochemistry]. 2009. vol. 45. no. 2. pp. 235–238. (in Russian).