Journals →  Non-ferrous Metals →  2018 →  #2 →  Back

ArticleName Influence of the shape of hydrogen-containing inclusions on the intergranular corrosion process of the Al – Si alloy system
DOI 10.17580/nfm.2018.02.03
ArticleAuthor Partyko E. G., Deev V. B., Gubanova M. I., Tolkachyova D. V.

Siberian Federal University, Krasnoyarsk, Russia.

E. G. Partyko, Assistant, Foundry Department, e-mail:
M. I. Gubanova, Post-Graduate Student, Foundry Department, e-mail:
D. V. Tolkachyova, Post-Graduate Student, Foundry Department, e-mail:


National University of Science and Technology “MISiS”, Moscow, Russia:

V. B. Deev, Professor, Department of Foundry Technology, e-mail:


It is known that the surface of aluminum alloys is characterized by the formation of pitting (point damage), which can subsequently cause intergranular corrosion. This corrosion damage is dangerous in that it is almost impossible to detect it visually, since it extends from surface into interior of the material. The effect of the form of hydrogen inclusions on the corrosion resistance of an Al – Si alloy is investigated. For the tests on intergranular corrosion were selected uncoated samples of silumin AK12 (ENAC-AlSi12(a), A04130) with different forms of hydrogen inclusions — atomic and molecular. The content of dissolved hydrogen in all samples is 0.2 cm3/100 g. The duration of methodical tests in special solution of sodium chloride (NaCl) and hydrochloric acid (HCl) is 24 hours. Additionally, two samples from each series were exposed to a solution of another 48 hours. Evaluation of the effects of intergranular corrosion on silumin samples was performed by metallographic method. Given the fact that the data on the loss of mass over a certain period of time are less reliable, in comparison with the data on the structure change over the same time. Then, the effect of intergranular corrosion on the mechanical properties of silumin was evaluated using the electromechanical universal testing machine. During the research was found that at the equal content of the dissolved hydrogen samples with molecular inclusions are more subject to intergranular destruction. This follows from the considerable depth of corrosion propagation and the decrease in the mechanical properties of silumin relative to the results for samples with atomic hydrogen. Wherein the analysis of the level of mechanical properties showed that after intergranular corrosion, the tensile strain decreases to a considerable extent.

The work was carried out within the project 14.578.21.0193 “Development of theoretical and technological solutions for hydrogen reduction in aluminum and lowalloyed aluminum alloys” of the Federal Target Program “Researches and developments in the priority directions of progress of Scientific and Technological Complex of Russia for 2014–2020” with the financial support of the Ministry of Education and Science of the Russian Federation. The unique identifier of agreement RFMEFI57816X0193.

keywords Hydrogen, aluminum alloy, silumin, corrosion, mechanical properties

1. Joseph R. Davis (Ed.). Corrosion of Aluminum and Aluminum Alloys. Ohio : ASM International, 1999. 313 p.
2. Bogdanova T. A., Dovzhenko N. N., Babkin V. G., Zhereb V. P., Merkulova A. V. et al. Structure formation of aluminum casting alloy for casting under low-pressure. Krasnoyarsk : Sibirskiy Fedederalniy Universitet, 2015. 164 p.
3. Laurent C., Scenini F., Monetta T., Bellucci F., Curioni M. The contribution of hydrogen evolution processes during corrosion of aluminium and aluminium alloys investigated by potentiodynamic polarisation coupled with real-time hydrogen measurement. npj Materials Degradation. 2017. Vol. 1, Iss. 1. DOI: 10.1038/s41529-017-0011-4.
4. Kablov E. N., Startsev O. V., Medvedev I. M. Review of international experience on corrosion and corrosion protection. J. Aviation Materials and Technologies. 2015. No. 2. pp. 76–87.

5. Lunarska E., Chernyaeva O. Effect of precipitates on hydrogen transport and hydrogen embrittlement of aluminum alloys. Materials Science. 2004. Vol. 40, Iss. 3. pp. 399–407.
6. Kim S. J., Han M. S., Jang S. K. Electrochemical characteristics of Al – Mg alloy in seawater for leisure ship: Stress corrosion cracking and hydrogen embrittlement. Korean Journal of Chemical Engineering. 2009. Vol. 26, Iss. 1. pp. 250–257.
7. Kumar S., Namboodhiri T., Precipitation hardening and hydrogen embrittlement of aluminum alloy AA7020. Bulletin of Materials Science. 2011. Vol. 34, Iss. 2. pp. 311–321.
8. Belyaev S. V., Kulikov B. P., Deev V. B., Baranov V. N., Rakhuba E. M. Analysis of Hydrogen Content in the Main Stages of Low-Alloy Aluminum Alloy Flat Ingot Manufacture. Metallurgist. 2017. Vol. 61, Iss. 3–4. pp. 325–329.
9. Bazhin V. Yu., Sizyakov V. M., Vlasov A. A., Feshchenko R. Yu. Surface defects in foil direct chill strip from highlyalloyed aluminum alloys. Metallurgist. 2013. Vol. 56, Iss. 11–12. pp. 863–866.
10. Deev V. B., Ponomareva K. V., Yudin A. S. Investigation into the density of polystyrene foam models when implementing the resource-saving fabrication technology of thin-wall aluminum sheet. Russian Journal of Non-Ferrous Metals. 2015. Vol. 56, Iss. 3. pp. 283–286.
11. Deev V. B., Selyanin I. F., Ponomareva K. V., Yudin A. S., Tsetsorina S. A. Fast cooling of aluminum alloys in casting with a gasifying core. Steel in Translation. 2014. Vol. 44, Iss. 4. pp. 254–254.
12. Kolonakov A. A., Kukharenko A. V., Deev V. B., Abaturova A. A. Structure and chemical composition of the AK-12MMgN piston alloy fabricated based on various charges. Russian Journal of Non-Ferrous Metals. 2015. Vol. 56, Iss. 4. pp. 428–433.

Full content Influence of the shape of hydrogen-containing inclusions on the intergranular corrosion process of the Al – Si alloy system