Influence of Low-Energy High-Current Electron Beam Exposure on the Phase Composition and Corrosion Resistance of the AM60 Magnesium Alloy

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Abstract

The surface of an AM60 (Al – 5.5, Zn – 0.2, Cu – 0.009, Fe – 0.005, Si – 0.1; Ni – 0.002, Mn – 0.3 wt.%, Mg – the rest) magnesium alloy was exposed to a low-energy high-current electron beam. After the irradiation, the content of the β-phase (Mg17Al12) decreases and the aluminum content increases in the alloy surface layer. After the exposure to the electron beam, the corrosion resistance of the alloy in a 1-molar NaCl solution increases significantly compared to the initial state. The physical reason for the increase in the alloy corrosion resistance after exposure to the electron beam is the higher corrosion resistance of the oxide film formed on the alloy surface due to the increased aluminum content.

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About the authors

K. O. Akimov

Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences

Author for correspondence.
Email: akimov_ko@ispms.ru
Russian Federation, Tomsk, 634055

K. V. Ivanov

Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences

Email: akimov_ko@ispms.ru
Russian Federation, Tomsk, 634055

M. G. Figurko

Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences

Email: akimov_ko@ispms.ru
Russian Federation, Tomsk, 634055

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Supplementary files

Supplementary Files
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2. Fig. 1. SEM image of the alloy surface indicating the areas of MRSA. The black arrow marks the β-phase, the white arrow marks the α-phase.

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3. Fig. 2. SEM images of the alloy surface after exposure to NSEP at low (a) and high (b) magnification.

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4. 3. Diffractograms of the alloy in the initial state and after exposure to NSEP in the range of 2θ: 30°-120° (a) and 35°-45° (b).

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5. 4. Nyquist graphs obtained with different exposure times in the alloy electrolyte: a – 30 min, b – 120 min and the corresponding equivalent scheme (c).

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6. 5. Potentiodynamic curves obtained for the alloy before and after exposure to HCEP at different exposure times in the electrolyte solution.

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7. Fig. 6. SEM images of the alloy surface after corrosion tests: a, b – before and after exposure to HCEP at 30 min exposure in electrolyte solution; c, d – before and after exposure to HCEP at 120 min exposure.

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8. Fig. 7. SEM images of cross-sections of alloy samples after corrosion tests: a, b – before and after exposure to HCEP at 30 min exposure in electrolyte solution; c, d – before and after exposure to HCEP at 120 min exposure.

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