Abstract
Micro-arc oxidation (MAO) sealed with poly(lactic-co-glycolic acid) (PLGA) composite coating was prepared on novel Mg-4Zn-0.6Zr-0.4Sr magnesium alloy. Immersion tests and slow strain rate tensile (SSRT) tests combined with in-situ electrochemical tests indicated that the MAO + PLGA coating significantly improved the corrosion and the stress corrosion cracking (SCC) resistance. The findings of this work indicate that a protective coating that is able to withstand deformation or stress is essential for maintaining the mechanical stability of a biodegradable Mg alloy in a stress corrosion environment. The widely used MAO coating only provides a limited improvement for the SCC resistance of biomedical ZK40-0.4Sr alloy.
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