A Survey of Sensitization in 5xxx Series Aluminum Alloys

The 5xxx series (Al-Mg-based) aluminum alloys suffer from intergranular corrosion and intergranular stress corrosion cracking when the alloy has become "sensitized." Sensitization refers to insidious precipitation of beta phase (Mg2Al3), which is problematic when present at grain boundarie...

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Published inCorrosion (Houston, Tex.) Vol. 72; no. 2; p. 144
Main Authors Zhang, R, Knight, S P, Holtz, R L, Goswami, R, Davies, C H J, Birbilis, N
Format Journal Article
LanguageEnglish
Published Houston NACE International 01.02.2016
Subjects
Alloys
Aluminum alloys
Corrosion
Grain boundaries
Heat treatment
Intergranular corrosion
Microstructure
Stress corrosion cracking
USA, Texas, Houston
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Summary:The 5xxx series (Al-Mg-based) aluminum alloys suffer from intergranular corrosion and intergranular stress corrosion cracking when the alloy has become "sensitized." Sensitization refers to insidious precipitation of beta phase (Mg2Al3), which is problematic when present at grain boundaries. The beta phase is electrochemically active and may preferentially dissolve. This paper reviews the relevant works that have documented the degree of sensitization for various 5xxx series alloys, providing a holistic overview of the issue, along with attention to the bulk composition, heat treatment, and microstructure.
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ISSN:0010-9312
1938-159X
DOI:10.5006/1787