Electrochemical characterization of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy in different pH environments

Priya Sudha, K. S. Tun, Manoj Gupta, Abdel Hamid I. Mourad, S. Vincent

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The corrosion behavior and microstructure of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy (Al LEA) were investigated in different Cl ion concentrations of acidic (HCl), neutral (NaCl), and alkaline (NaOH) media. The study was performed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The surface morphologies and chemical composition were examined by using a scanning electron microscope with energy-dispersive X-ray spectroscopy. The results indicated that with the increase of the Cl ion concentrations, the degradation rate with more pits and cracks was observed in both acidic and neutral media. This is due to the breakdown of Al(OH)3/Al2O3 passive layer. In an alkaline medium, increasing of pH value from pH 8 to pH 12, there was a slight increment in corrosion rate (CR). However, the corrosion trend was not witnessed on alloy surfaces because of the formation of Mg32(Al, Zn)49 and AlCu phases, which are more stable than α-Al. The order of Al-LEA CR is found to be HCl > NaCl > NaOH. The results obtained from the polarization and EIS were in good agreement with each other.

Original languageEnglish
Pages (from-to)2071-2083
Number of pages13
JournalMaterials and Corrosion
Volume73
Issue number12
DOIs
Publication statusPublished - Dec 2022

Keywords

  • Cl ions
  • corrosion
  • disintegrated melt deposition (DMD) technique
  • electrochemical impedance spectroscopy (EIS)
  • energy-dispersive x-ray spectroscopy (EDS)
  • low entropy alloys
  • magnesium alloys
  • passivity
  • potentiodynamic polarization (PDP)
  • scanning electron microscope (SEM)

ASJC Scopus subject areas

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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