The corrosion of aluminum matrix composite in situ based on Al–7Si–1Fe alloy
https://doi.org/10.17073/0021-3438-2019-6-70-74
Abstract
The paper provides the results of a comparative corrosion resistance study of the aluminum matrix composite produced by the method of oxygen lancing of pre–hydrogenated Al–Si–Fe aluminum alloy melt with an iron content of over 1.0 % and Al–7%Si alloy with an iron content of 0.3 % modified by the 5Al–Ti master alloy in the amount of 2 %. Corrosion in aluminum alloys is conditioned by the oxide film discontinuity in some phases, primarily Al5SiFe. Pairs of composite and reference alloy samples with a diameter of 15 mm and a length of 50 mm were tested in a 7 % solution of NaCl salt fog in SFC-1 chamber on suspension brackets at 22 °C for 300 hours. The obtained results show close values of mass losses for samples despite the significantly higher iron content in the material since 100–200 nm particles formed in the melt by oxygen lancing are deposited on the phase boundaries and reduce the area of the surface in contact with the corrosive environment. Literature data show a considerable difference in the corrosion resistance of composites ex situ from in situ due to different sizes and locations in the hardening phase matrix. The studied composite material can be recommended as a corrosion-resistant alternative to alloys with the high iron content that are used for high pressure die casting (HPDC).
About the Authors
A. B. Finkelstein
Ural Federal University
Russian Federation
Russian Federation
Dr. Sci. (Tech.), Full prof., Department of foundry engineering and strengthening technologies
620002, Russia, Ekaterinburg, Mira str., 19
A. V. Shak
Ural Federal University
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Head of Laboratory, Department of rare metals and nanomaterials
620002, Russia, Ekaterinburg, Mira str., 19
A. A. Schaefer
Ural Federal University
Russian Federation
Russian Federation
Assistant, Department of foundry engineering and strengthening technologies
620002, Russia, Ekaterinburg, Mira str., 19
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Review
For citations:
Finkelstein A.B., Shak A.V., Schaefer A.A. The corrosion of aluminum matrix composite in situ based on Al–7Si–1Fe alloy. Izvestiya. Non-Ferrous Metallurgy. 2019;(6):70-74. (In Russ.) https://doi.org/10.17073/0021-3438-2019-6-70-74
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