The corrosion behaviour of a novel Mg–Zn–Zr–Y–Cu alloy

Abstract

A novel Mg–Zn–Zr–Y–Cu alloy was fabricated, and its corrosion behaviour was investigated in the present work. The results showed that, compared with Mg–6Zn–0.5Zr (ZK60) alloy, Mg–6Zn–1Y–0.5Cu–0.5Zr (ZWCK6100) alloy exhibited finer recrystallised (DRXed) and unDRXed grains, more homogeneous microstructure, and contained CuMgZn and I phase (Mg₃Zn₆Y) in addition to α-Mg, Zn₂Zr, MgZn₂ precipitates. As a result, ZWCK6100 alloy had a lower corrosion rate and higher corrosion resistance, underwent slightly localised corrosion in 3.5 wt-% NaCl solution, implying that the combined addition of Y and Cu was conducive to improving the corrosion resistance of Mg alloys.

KEYWORDS:

• Mg–Zn–Zr–Y–Cu alloy
• alloying
• microstructure
• grain refinement
• corrosion behaviour

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by Xi'an Shiyou University Foundation, China [grant number YCS21111017]; Natural Science Foundation of Shanxi Province, China [grant number 202103021224193].