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.
Skip Nav Destination
Article navigation
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.
Search for other works by this author on:
M. Halvarsson;
M. Halvarsson
**Department of Physics, Chalmers University of Technology, Gothenburg, Sweden.
Search for other works by this author on:
J.E. Svensson;
J.E. Svensson
***Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
Search for other works by this author on:
A. Allanore;
A. Allanore
****Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.
Search for other works by this author on:
N. Birbilis;
N. Birbilis
*****College of Engineering and Computer Science, The Australian National University, Canberra, Australia.
Search for other works by this author on:
L.G. Johansson;
L.G. Johansson
***Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
Search for other works by this author on:
M. Esmaily
M. Esmaily
‡
****Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.
‡Corresponding author: [email protected].
Search for other works by this author on:
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
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
Sign in via your Institution
Sign in via your InstitutionCiting articles via
Identification of Synergistic Interactions in Green Corrosion Inhibitor Mixtures by Molecular Modeling
Carlos M. Menendez, Oleg A. Mazyar, Sunder Ramachandran, Tracey Jackson
Resistance of the welded joint of X70 steel for main gas pipelines against corrosion-mechanical cracking under cathodic polarization in near-neutral pH solutions
Lyudmila Nyrkova, Larysa Goncharenko, Yuriy Lisovskiy, Leonid Faynberg, Valeriy Kostin
Effect of Non-Essential Alloying Elements and Solution pH on Corrosion Behavior of Al-Mg Alloys Fabricated by Cold Spray Deposition
Munsu Kim, Luke N. Brewer, Gregory W. Kubacki
Effects of Al content on the mechanical properties and corrosion behavior of Ni-Al coatings on 310S heat-resistant steel for CSP plants
Shipeng Xu, Yuehong Zheng, Faqi Zhan, Peiqing La
