The localized corrosion of the two magnesium-aluminum alloys AM50 and AZ91 produced by a semisolid casting method was investigated under atmospheric corrosion conditions, in the presence of NaCl. Gravimetry confirmed the beneficial effect from ambient levels of carbon dioxide (CO2) in suppressing corrosion through the formation of magnesium hydroxy carbonates. Both 2D and 3D characterization revealed that ambient CO2 has a strong influence on the morphology and rate of localized corrosion. In CO2-free atmosphere, the alloys suffered localized corrosion resulting in clustered and interconnected cavities that extended deep into the material. In contrast, corrosion in the presence of ambient levels of CO2 (400 ppm) resulted in evenly distributed shallow corrosion sites. The results indicate that CO2 neutralizes the cathodic areas resulting in diminished cathodic activity and inhibiting NaCl(aq) droplet coalescence.
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1 February 2021
Research Article|
November 24 2020
Localized Atmospheric Corrosion of Magnesium-Aluminum Alloys Produced by Semisolid Casting: A 2D and 3D Investigation
M. Shahabi-Navid
;
M. Shahabi-Navid
*Volvo Group Trucks Technology, Gothenburg, Sweden.
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M. Halvarsson
;
M. Halvarsson
**Department of Physics, Chalmers University of Technology, Gothenburg, Sweden.
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J.E. Svensson
;
J.E. Svensson
***Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
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A. Allanore
;
A. Allanore
****Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.
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N. Birbilis
;
N. Birbilis
*****College of Engineering and Computer Science, The Australian National University, Canberra, Australia.
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L.G. Johansson
;
L.G. Johansson
***Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
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M. Esmaily
M. Esmaily
‡
****Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.
‡Corresponding author: esmaily@mit.edu.
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CORROSION (2021) 77 (2): 242–253.
Citation
M. Shahabi-Navid, M. Halvarsson, J.E. Svensson, A. Allanore, N. Birbilis, L.G. Johansson, M. Esmaily; Localized Atmospheric Corrosion of Magnesium-Aluminum Alloys Produced by Semisolid Casting: A 2D and 3D Investigation. CORROSION 1 February 2021; 77 (2): 242–253. doi: https://doi.org/10.5006/3655
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