On the corrosion of a high solute Al-Zn-Mg alloy produced by laser powder bed fusion

A. P. Babu, S. Choudhary, J. C. Griffith, A. Huang, N. Birbilis

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28 Citations (Scopus)

Abstract

An additively manufactured aluminium alloy with very high solute content, Al-14Zn-3Mg (wt. %), was studied herein. Compared to wrought AA7075-T6 as a benchmark, Al-14Zn-3Mg revealed a lower rate of corrosion, attributed to its microstructure and solute content. Specifically, the lack of coarse intermetallic particles in the Al-14Zn-3Mg led to reduced cathodic kinetics relative to AA7075-T6. Potentiodynamic polarisation tests and electrochemical impedance spectroscopy analysis was performed, along with XPS studies of the corresponding surface films. The findings herein demonstrate the corrosion behaviour of a new high solute aluminium alloy manufactured in net shape through LPBF.

Original languageEnglish
Article number109626
Number of pages16
JournalCorrosion Science
Volume189
DOIs
Publication statusPublished - 15 Aug 2021

Keywords

  • A. Aluminium
  • B. Polarization
  • C. Anodic dissolution
  • C. Passive films
  • C. Pitting corrosion

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