Corrosion electrochemical behavior of metal matrix composites “Al-nano-Al2O3” IN 0.5M NaCl aqueous solution

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Аннотация

The corrosion-electrochemical behavior of nanocomposites of the “aluminum-nano-aluminum oxide” system, formed by direct chemical interaction of molten aluminum with titanium nanooxide in an environment of molten alkali metal chlorides at temperatures above 700оC, has been studied. Nanoalumina crystals in the α-Al2O3 modification, uniformly distributed throughout the volume of the metal matrix, were detected by means of electron microscopy and X-ray diffraction. The corrosion rate in 0.5M NaCl, determined by the gravimetric method, decreases by 3–4 times when moving from initial aluminum to Al-Al2O3 composites, while the nature of corrosion changes from pitting to uniform and the corrosion resistance class from 3 (resistant) to 2 (very persistent). This is due to the formation of a denser single-phase hydroxide coating on the surface of the composite compared to a two-phase loose coating on aluminum. The corrosion potential is not affected by the incorporation of aluminum oxide nanoparticles into the aluminum matrix.

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Авторлар туралы

A. Kvashnichev

Institute of High-Temperature Electrochemistry Ural Branch of RAS

Email: yolshina@ihte.ru
Ресей, Yekaterinburg

L. Yolshina

Institute of High-Temperature Electrochemistry Ural Branch of RAS

Хат алмасуға жауапты Автор.
Email: yolshina@ihte.ru
Ресей, Yekaterinburg

V. Pryakhina

Ural Federal University named by B.N. Yeltsin

Email: yolshina@ihte.ru
Ресей, Yekaterinburg

Әдебиет тізімі

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2. Fig. 1. Cross-sectional image of the Al-Al2O3 composite in secondary electron radiation

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3. Fig. 2. X-ray diffractogram of the aluminum-aluminum oxide composite

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4. Fig. 3. Electronic images of the surface of the samples after 3 months of exposure in 0.5 NaCl solution: a – aluminum, b – aluminum-oxide composite

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5. Fig. 4. Electron micrography (a) and a table of aluminum and oxygen contents at various points of the oxide coating on the surface of the composite Al-10.1Al2O3 (wt.%), obtained from microrentgenospectral analysis

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6. Fig. 5. X-ray diffractogram of aluminum (a) and aluminum oxide composite (b) samples after 12 weeks of exposure in 0.5 M NaCl solution

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7. Fig. 6. Overview photoelectron spectrum of the Al-10.1 Al2O3 (wt.%) composite sample after a 12-week corrosion test in 0.5M NaCl solution.

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8. Fig. 7. High-resolution Al2p spectrum of the Al-10.1 Al2O3 (wt.%) composite sample after a 12-week corrosion test in 0.5M NaCl solution.

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9. Fig. 8. Chronopotentiograms of the initial aluminum (1) and aluminum composites containing 2– Al-13.5Al2O3 (wt.%) and 3– Al-8.7al2o3 (wt.%) in 0.5M NaCl solution.

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10. Fig. 9. Polarization curves of the initial aluminum (1) and the studied aluminum composites containing aluminum oxide in the amount of: 2-8.2%, 3-7.8%, 4-13% in a neutral solution of 0.5M NaCl.

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