Role of trace additions of Mn and Y in improving the corrosion resistance of Mg–3Al–1Zn alloy

•The corrosion resistance of Mg–3Al–1Zn-based alloys with different Mn and Y content was investigated.•The experimental alloy with trace Mn and Y had Al8Mn4Y particles instead of typical Al-Mn particles.•The novel alloy showed a four times slower corrosion rate than a commercial AZ31 alloy in a NaCl...

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Bibliographic Details
Published in:Corrosion science 2021-01, Vol.178, p.108998, Article 108998
Main Authors: Baek, Soo-Min, Lee, Si-Young, Kim, Jong Chan, Kwon, Jaeho, Jung, Hoseok, Lee, Sooseok, Lee, Ki-Suk, Park, Sung Soo
Format: Article
Language:English
Subjects:
Alloys
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Magnesium base alloys
Manganese
Mg alloy
Microgalvanic corrosion
Phase
Submerging
Volta potential
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Summary:•The corrosion resistance of Mg–3Al–1Zn-based alloys with different Mn and Y content was investigated.•The experimental alloy with trace Mn and Y had Al8Mn4Y particles instead of typical Al-Mn particles.•The novel alloy showed a four times slower corrosion rate than a commercial AZ31 alloy in a NaCl solution.•Factors influencing the improved corrosion resistance of the novel experimental alloy are discussed. The corrosion resistance of conventional and experimental Mg–3Al–1Zn-based alloys with different Mn and Y content was comparatively investigated. After immersion for 72 h in a 0.6 M NaCl solution at 25 °C, an experimental Mg–3Al–1Zn–0.05Mn–0.03Y alloy exhibited a corrosion rate of 0.91 mm y−1, which is about four times slower than that of a conventional Mg–3Al–1Zn–0.3Mn alloy. Microstructural factors underlying the improved corrosion resistance achieved by the trace additions of Mn and Y are discussed.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.108998