4.7 Article

Superhydrophobic composite coating for reliable corrosion protection of Mg alloy

Journal

MATERIALS & DESIGN
Volume 215, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2022.110433

Keywords

Magnesium alloys; Superhydrophobic coating; Microarc oxidation; Synergistic protection; Anticorrosion

Funding

  1. National Natural Science Foundation of China [52075458]
  2. Sichuan Science and Technology Program [2021JDRC0094]

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Endowing Mg alloy surface with superhydrophobicity can effectively solve its poor corrosion resistance and broaden its application fields. A bilayer composite coating composed of microarc oxidation layer and superhydrophobic layer was fabricated to protect Mg alloys, showing excellent water-repellent, self-cleaning properties, and environmental stability. The synergistic barrier protection of microarc oxidation layer and superhydrophobic layer provides effective corrosion protection for Mg alloys in different service environments.
Endowing Mg alloy surface with superhydrophobicity solves its poor corrosion resistance for broadening the wide application fields. However, the superhydrophobicity is vulnerable to failure under service environments due to the exfoliation and degradation of surface material. Hence, a bilayer composite coating composed of microarc oxidation layer and superhydrophobic layer was fabricated to protect Mg alloys by modulating superhydrophobic coating/substrate interface. The bilayer coating with a water contact angle of 158.3 degrees possesses excellent water-repellent, and self-cleaning properties. In addition, the bilayer coating consistently remains superhydrophobicity in acid, alkaline, high/low temperature, and ultraviolet radiation environments, indicating the excellent environmental stability. Notedly, the lowest-frequency impedance value of bilayer coating (6.78 x 10(6) Omega.cm) increases five orders of magnitude compared with that of Mg alloy (60.2 Omega.cm), and the inhibition efficiency is calculated to be 99.99 %. The excellent corrosion resistance of coating is attributed to the synergistic barrier protection of microarc oxidation layer and superhydrophobic layer, implying that it provides effective protection for Mg alloy. Therefore, the as-prepared bilayer coating has great application prospects in corrosion protection of Mg alloys toward different service environments. (C) 2022 The Authors. Published by Elsevier Ltd.

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