Abstract
Corrosion behaviors of biodegradable Zn alloys with ternary phases are rarely studied. This paper reveals three-stage 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 µm.
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