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Evaluation of Corrosion Resistance for ZIF-67@Co-M (M = Fe, Al, Ni) LDHs Composite Coatings Based on AZ31 Magnesium Alloy
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PRE
AI
陈
Z
F
M
G
J
潘
L
DOI：10.1007/s40195-025-01910-5.png)
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Abstract
En 中文
The widespread application of magnesium (Mg) and Mg alloys is limited by their poor corrosion resistance. Micro-arc oxidation (MAO) is a common surface treatment, but the inherent defects of the MAO coating require post-treatment to ensure good corrosion protection. Therefore, various zeolitic imidazolate framework ZIF-67@Co-M (M = Fe, Al, Ni) layered double hydroxides (LDHs) composite coatings were fabricated on MAO-treated AZ31 Mg alloy to enhance its corrosion resistance. The surface characteristics, coating thickness, corrosion resistance and protection mechanisms of the ZCM (ZIF-67@Co-M LDHs) composite coatings were examined. The findings indicate that the ZCF (ZIF-67@Co-Fe LDHs) composite coating exhibits the lowest corrosion current density (icorr = 7.76 × 10–8 A/cm2), superior corrosion resistance, the lowest corrosion rate (HEV = 2.46 mL·cm–2) and the fastest response speed to corrosion. The synergistic integration of ZIF-67 and LDHs effectively prevents the invasion of corrosive media, enhancing both short-term and long-term corrosion resistance of AZ31 alloys. These composite coatings surpass the limitations of individual materials, providing a promising strategy for durable corrosion protection.
Keywords:
Mg alloy
Micro-arc oxidation (MAO)
Zeolitic imidazolate framework (ZIF-67)
Layered double hydroxides (LDHs)
Coating
Anti-corrosion
Journal
A
IF:
3.9
Papers:
79
Citations:
5.0K
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