The effect of the secondary phases on the corrosion of AZ31B and WE43-T5 Mg alloys

The effect of secondary phases of AZ31B and WE43-T5 Mg alloys on corrosion behaviors was studied in 3.5 wt% NaCl solution. Electrochemical and microstructural characterizations revealed that compared to AZ31B, WE43-T5 suffered less hydrogen evolution without corrosion film breakdown. The corrosion f...

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Published inCorrosion science Vol. 211; p. 110920
Main Authors Shih, Cian-Huei, Huang, Chao-Yu, Hsiao, Ting-Hsuan, Lin, Chao-Sung
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2023
Subjects
A. magnesium
B. STEM
C. galvanic coupling
C. passive films
B. STEM
C. passive films
C. galvanic coupling
A. magnesium
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Summary:The effect of secondary phases of AZ31B and WE43-T5 Mg alloys on corrosion behaviors was studied in 3.5 wt% NaCl solution. Electrochemical and microstructural characterizations revealed that compared to AZ31B, WE43-T5 suffered less hydrogen evolution without corrosion film breakdown. The corrosion film of both AZ31B and WE43-T5 was mainly Mg oxide/hydroxide. The TEM analysis revealed that Y and Nd oxide/hydroxide enrichment in the corrosion film/WE43-T5 interface resulted from the corrosion of the strengthening nanoparticles. Conversely, the Al-rich layer was not detected at the corrosion film/AZ31B interface, and the Al-Mn secondary phases caused severe galvanic corrosion. •WE43-T5 had less evolved hydrogen without corrosion film breakdown.•Galvanic corrosion prevailed at Al-Mn particle and α-Mg of AZ31B.•Galvanic corrosion was very mild at Mg24Y5 and α-Mg of WE43-T5.•Y and Nd species were enriched in corrosion film/WE43-T5 interface.•Y, Nd oxide/hydroxide played a major role in the corrosion resistance of WE43-T5.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2022.110920