Relation Between Zn Additions, Microstructure and Corrosion Behavior of New Wrought Mg-5Al Alloys

  • Polina Metalnikov
  • Guy Ben-HamuEmail author
  • Kwang Seon Shin


In the present study, the effect of varying Zn additions (0.93–3.16 wt%) on the corrosion resistance of wrought Mg-5Al alloys was studied and related to the microstructure changes. Three secondary phases were found: Al–Mn, β-Mg17Al12 enriched with Zn, and Φ-Mg21(Al, Zn)17; the latter observed only in alloys with relatively high Zn content. The corrosion behavior in short periods of immersion is related to pitting corrosion, and strongly influenced by micro-galvanic effects between the secondary phase particles and the α-Mg matrix. In long periods of immersion, a protective layer is formed, and filiform corrosion observed for alloys with Zn content above 1 wt%. However, the micro-galvanic effects still play a crucial role in deterioration of corrosion resistance in alloys with relatively high Zn content. These effects depend on the cathodic behavior of the particles, and on the total number of the particles presented on the alloy’s surface.

Graphic Abstract


Magnesium alloys Zn content Microstructure Corrosion resistance Filiform corrosion 



We would like to thank Dr. Vladimir Ezersky for the TEM measurements. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.


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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringSami Shamoon College of EngineeringAshdodIsrael
  2. 2.Department of Material EngineeringBen-Gurion University of the NegevBeer-ShevaIsrael
  3. 3.Magnesium Technology Innovation Center, RIAM, School of Materials Science and EngineeringSeoul National UniversitySeoulRepublic of Korea

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