Abstract
The widespread application of magnesium (Mg) and Mg alloys is limited by their poor corrosion resistance. The anti-corrosion performance of micro-arc oxidation (MAO) is not ideal enough. Therefore, this study fabricated various LDHs@ZIF-67 composite coatings on MAO-coated Mg alloy. The surface and interface structure, composition, corrosion stability and mechanism of the LDHs@ZIF-67 composite coatings were investigated. The results suggested that the MgCo LDHs@ZIF-67 coating represented the lowest corrosion current density (icorr = 2.51 × 10−8 A/cm2), the lowest corrosion rate (hydrogen evolution volume = 3.21 mL·cm−2) and the best corrosion resistance. The stable existence of LDHs and ZIF-67 structures synergistically integrated to produce a denser composite coating, enhancing the corrosion resistance of AZ31, and surpassing the limitations of individual materials in providing long-term corrosion protection. Such composite coatings are poised to offer efficacious solutions to prevalent metal corrosion issues.
Published Version
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