In Situ Growth of ZIF-8 on Surface of Micro-arc Oxidation Coatings for Corrosion Resistance and Antibacterial Properties

SHAO Zijie; CHEN Fei

doi:10.16490/j.cnki.issn.1001-3660.2025.15.015

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Surface Technology ›› 2025, Vol. 54 ›› Issue (15) : 165-175. DOI: 10.16490/j.cnki.issn.1001-3660.2025.15.015

In Situ Growth of ZIF-8 on Surface of Micro-arc Oxidation Coatings for Corrosion Resistance and Antibacterial Properties

SHAO Zijie, CHEN Fei^*

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Abstract

The ordinary micro-arc oxidation (MAO) coating has microporous cracks and defects, making it ineffective in protecting magnesium alloy. Sealing is required to enhance the corrosion resistance of the coating. ZIF-8, a typical metal-organic framework (MOF) material, offers excellent chemical stability and a well-defined pore structure, making it widely applicable. It can increase the thickness of the MAO coating, extend the corrosion pathway, and improve its corrosion resistance. This study aims to enhance the in-situ growth of ZIF-8 on the metal surface by first depositing a ZnO layer on the original MAO coating through magnetron sputtering, resulting in a Zn²⁺-containing MAO composite coating. On this basis, the zeolite imidazolium ester skeleton material (ZIF-8) film prepared by in-situ growth method is used to seal the micro-arc oxidation layer, and a MAO/ZIF-8 composite coating is obtained. The effects of ligand dimethylimidazole concentration and water bath reaction time on the corrosion resistance of the MAO/ZIF-8 coatings during the in situ growth process of ZIF-8 are investigated, and the corrosion resistance of the composite coatings is further improved by filling the defects of the micro-arc oxidation micropores with ZIF-8 nanoparticles, which results in the active corrosion protection of the coatings. A scanning electron microscopy (SEM), an energy spectrometry (EDS), an X-ray diffraction (XRD) and an X-ray photoelectron spectroscopy (XPS) are used to characterise the microscopic morphology and phase composition of the coatings, respectively, to detect the corrosion resistance of the coatings by electrochemical alternating current impedance (EIS), and to detect the antimicrobial properties of the composite coatings by antibacterial test. The results show that on the basis of the micro-arc oxidation coating, providing a Zn source by magnetron sputtering, while introducing different ratios of organic ligands (2-methylimidazole) and adjusting the reaction time of the water bath to regulate the degree of filling of the pores of the coating helps to form a more homogeneous and dense coating structure covering the defects of the micro-arc oxidation coatings, which in turn affects the corrosion resistance of the composite coatings. With the introduction of dimethylimidazole 0.55 g and a water bath reaction time of 6 h, the impedance modulus of the coating is increased to 10⁴ Ω·cm², the hydrophobicity is increased to 112°, and the antimicrobial performance is improved (the antimicrobial rate reaches 98.52%). The introduction of ZIF-8 enhances the physical barrier performance of the MAO layer and fills up the micropores of the MAO, which can effectively prevent the penetration of the corrosive electrolytes and slow down the erosion of corrosive media, thus significantly affecting the corrosion resistance of the composite coatings. At the same time, the release of Zn²⁺ ions in ZIF-8 and its oxidative stress reaction, the nanostructure of ZIF-8 can optimize the antimicrobial performance of the coating. Magnetron sputtering technology, as an emerging thin film deposition method, in combination with micro-arc oxidation, becomes a unique means of surface modification in order to introduce ZIF-8 to metal surfaces and endow them with multiple possibilities.

Key words

micro-arc oxidation / metal-organic frameworks / magnetron sputtering / corrosion resistance / antimicrobial properties

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SHAO Zijie, CHEN Fei. In Situ Growth of ZIF-8 on Surface of Micro-arc Oxidation Coatings for Corrosion Resistance and Antibacterial Properties[J]. Surface Technology. 2025, 54(15): 165-175 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.15.015

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