Unique corrosion resistance of ultrahigh pressure Mg-25Al binary alloys.

Feng, Jiawen; Li, Hanning; Deng, Kunkun; Fernandez, Carlos; Zhang, Qingrui; Peng, Qiuming

Abstract

Differing from as-cast and solid-solution alloys with coarse eutectic phases (Mg17Al12), a single-phase structure is attained in Mg-25wt.%Al alloy after ultrahigh-pressure solid-solution (USS, 800 oC, 4GPa). This USSed Mg-25wt.%Al sample exhibits a prominent age-hardening response due to the nano-scaled Mg17Al12 particles. Three testing methods confirm that USS-aged Mg-25wt.%Al alloy shows good corrosion resistance, which overwhelms the majority of Mg-based alloys reported so far, near to high purity Mg. The main reason is attributed to the formation of Al-rich oxide layer, wherein residual stress and pitting corrosion are eliminated. It provides a new avenue for developing corrosion resistant Mg alloys.

Citation

FENG, J., LI, H., DENG, K., FERNANDEZ, C., ZHANG, Q. and PENG, Q. 2018. Unique corrosion resistance of ultrahigh pressure Mg-25Al binary alloys. Corrosion science [online], 143, pages 229-239. Available from: https://doi.org/10.1016/j.corsci.2018.08.013

• Journal Article Type: Article
• Acceptance Date: Aug 7, 2018
• Online Publication Date: Aug 15, 2018
• Publication Date: Oct 31, 2018
• Deposit Date: Aug 16, 2018
• Publicly Available Date: Aug 16, 2019
• Journal: Corrosion science
• Print ISSN: 0010-938X
• Electronic ISSN: 1879-0496
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 143
• Pages: 229-239
• DOI: https://doi.org/10.1016/j.corsci.2018.08.013
• Keywords: MgAl alloy; Ultrahigh pressure; Corrosion properties
• Public URL: http://hdl.handle.net/10059/3070