Three-stage degradation behavior and dealloying assisted galvanic corrosion mechanism of 300 MPa grade Zn-2Cu-xLi (x=0.2-0.8) alloys in simulated body fluid
CORROSION SCIENCE(2024)
摘要
Corrosion behaviors of biodegradable Zn alloys with ternary phases are rarely studied. This paper reveals threestage corrosion behavior of high -strength Zn-2Cu-(0.2-0.8)Li alloys immersed in simulated body fluid for 30 days. At stage I, Zn phase is preferentially corroded due to cathodic Zn-Cu-Li ternary phases recently identified. At stage II, corrosion is suppressed due to formation of protective layer containing LiOH and Li2CO3 with appropriate Pilling -Bedworth ratios. At stage III, dealloying of Zn-Cu-Li phases rises their Cu contents, accelerating galvanic corrosion and resulting in large pits beyond 200 mu m.
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关键词
Biodegradable Zn alloys,Zn-Cu-Li ternary phase,Corrosion behavior
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