ZIF-8-based micro-arc oxidation composite coatings enhanced the corrosion resistance and superhydrophobicity of a Mg alloy

• DOI: 10.1016/j.jma.2021.07.027
• Publication Date: 2021-09-01T11:56:28Z
• Authors: Shiquan Jiang; Zhiyuan Zhang; Dong Wang; Yuqing Wen; Ning Peng; Wei Shang
• Keywords: Conversion coating

Mg alloys are considered the most promising engineering materials because of their unique properties. However, uncontrolled corrosion rate these limits applications. Therefore, in this study, a micro-arc oxidation layer was used as transition to “directly” grow zinc-based metal-organic framework (MOF) composite coating on surface alloy (AZ91D). Herein, two zeolitic imidazolate (ZIF-8) coatings with different morphologies were separately prepared by homologous metal oxide induction and one-step in-situ growth method. The superhydrophobic showed strong hydrophobicity self-cleaning properties, which could prevent penetration water corrosive ions (Cl−) into AZ91D. Electrochemical tests demonstrated that super-hydrophobic greatly enhanced resistance AZ91D, current density decreased from 10−5 10−9 A/cm2. These results indicate ZIF-8 beneficial for improving enhancing alloys. MOF provide new strategy can be prepare multifunctional anticorrosion substrates.