On the electrochemical and quasi in situ corrosion response of the Q-phase (AlxCuyMgzSiw) intermetallic particle in 6xxx series aluminum alloys

S. K. Kairy, P. A. Rometsch, C. H.J. Davies, N. Birbilis

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

The electrochemical response and corrosion associated with the Q-phase (AlxCuyMgzSiw) intermetallic compound was studied. Q-phase intermetallics are the principal strengthening phase in a number of Cu-containing 6xxx series (Al-Mg-Si) alloys, and Q-phase has not previously been uniquely studied in regard to its influence on localized corrosion in detail. Herein, quasi in situ scanning transmission electron microscopy was utilized in understanding the localized corrosion response associated with nanoscale Q-phase precipitates in a Cu-containing 6xxx series Al alloy sheet with a composition (in wt%): 97.3Al-0.9Si-0.74Mg-0.84Cu-0.08Fe-0.14Mn. Furthermore, the Q-phase compound was also produced on the microscale within a bulk-synthesized alloy. The electrochemical behavior of the microscale Q-phase was studied using a micro-electrochemical capillary cell and by potentiodynamic polarization. Quasi in situ scanning electron microscopy was also performed on the bulk alloy synthesized to contain microscale Q-phase, revealing that Q-phase was comparatively noble relative to the matrix and other intermetallic phases present—even following extended immersion in 0.1 M NaCl. The work herein also indicates that Q-phase undergoes incongruent dissolution/dealloying, with fine nanoscale Cu particles, containing multiple twins, were observed upon Q-phase following a period of corrosion.

Original languageEnglish
Pages (from-to)87-99
Number of pages13
JournalCorrosion
Volume73
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • 6xxx series
  • Al alloys
  • Dealloying
  • Microstructure
  • Transmission electron microscopy

Cite this

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abstract = "The electrochemical response and corrosion associated with the Q-phase (AlxCuyMgzSiw) intermetallic compound was studied. Q-phase intermetallics are the principal strengthening phase in a number of Cu-containing 6xxx series (Al-Mg-Si) alloys, and Q-phase has not previously been uniquely studied in regard to its influence on localized corrosion in detail. Herein, quasi in situ scanning transmission electron microscopy was utilized in understanding the localized corrosion response associated with nanoscale Q-phase precipitates in a Cu-containing 6xxx series Al alloy sheet with a composition (in wt{\%}): 97.3Al-0.9Si-0.74Mg-0.84Cu-0.08Fe-0.14Mn. Furthermore, the Q-phase compound was also produced on the microscale within a bulk-synthesized alloy. The electrochemical behavior of the microscale Q-phase was studied using a micro-electrochemical capillary cell and by potentiodynamic polarization. Quasi in situ scanning electron microscopy was also performed on the bulk alloy synthesized to contain microscale Q-phase, revealing that Q-phase was comparatively noble relative to the matrix and other intermetallic phases present—even following extended immersion in 0.1 M NaCl. The work herein also indicates that Q-phase undergoes incongruent dissolution/dealloying, with fine nanoscale Cu particles, containing multiple twins, were observed upon Q-phase following a period of corrosion.",
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On the electrochemical and quasi in situ corrosion response of the Q-phase (AlxCuyMgzSiw) intermetallic particle in 6xxx series aluminum alloys. / Kairy, S. K.; Rometsch, P. A.; Davies, C. H.J.; Birbilis, N.

In: Corrosion, Vol. 73, No. 1, 01.01.2017, p. 87-99.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - On the electrochemical and quasi in situ corrosion response of the Q-phase (AlxCuyMgzSiw) intermetallic particle in 6xxx series aluminum alloys

AU - Kairy, S. K.

AU - Rometsch, P. A.

AU - Davies, C. H.J.

AU - Birbilis, N.

PY - 2017/1/1

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AB - The electrochemical response and corrosion associated with the Q-phase (AlxCuyMgzSiw) intermetallic compound was studied. Q-phase intermetallics are the principal strengthening phase in a number of Cu-containing 6xxx series (Al-Mg-Si) alloys, and Q-phase has not previously been uniquely studied in regard to its influence on localized corrosion in detail. Herein, quasi in situ scanning transmission electron microscopy was utilized in understanding the localized corrosion response associated with nanoscale Q-phase precipitates in a Cu-containing 6xxx series Al alloy sheet with a composition (in wt%): 97.3Al-0.9Si-0.74Mg-0.84Cu-0.08Fe-0.14Mn. Furthermore, the Q-phase compound was also produced on the microscale within a bulk-synthesized alloy. The electrochemical behavior of the microscale Q-phase was studied using a micro-electrochemical capillary cell and by potentiodynamic polarization. Quasi in situ scanning electron microscopy was also performed on the bulk alloy synthesized to contain microscale Q-phase, revealing that Q-phase was comparatively noble relative to the matrix and other intermetallic phases present—even following extended immersion in 0.1 M NaCl. The work herein also indicates that Q-phase undergoes incongruent dissolution/dealloying, with fine nanoscale Cu particles, containing multiple twins, were observed upon Q-phase following a period of corrosion.

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KW - Al alloys

KW - Dealloying

KW - Microstructure

KW - Transmission electron microscopy

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