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Abstract <p>The corrosion of magnesium (Mg) alloys is detrimental to marine ships, pipelines, transportation, etc. Although superhydrophobic surfaces can effectively protect against corrosion by maintaining an air gap between the solid structure and corrosive media, their long-term corrosion resistance remains limited due to the intrinsic properties of the base materials. Herein, we developed a novel superhydrophobic composite coating with superior corrosion resistance by spraying a mixture of superhydrophobic particles, hexadecyltrimethoxysilane (HDTMS)-modified ZnO nanosheet-decorated diatomite (ZnO@DME/HDTMS), and epoxy resin (E51) onto the surface of AZ31B Mg alloy. The resulting ZnO@DME/HDTMS composite coating exhibited outstanding stability and retained its superhydrophobicity over a wide temperature range (0–200&#xa0;°C). Moreover, the coating demonstrated excellent adhesion and mechanical robustness in tape-peeling and friction tests. Compared to coatings without superhydrophobic particles, the ZnO@DME/HDTMS composite coating showed significantly lower corrosion rates and enhanced overall corrosion resistance in a 3.5 wt% NaCl solution, simulating marine environments. This work not only offers a superhydrophobic composite coating for the anticorrosion of Mg alloys in marine environments, but also gives a new strategy for preparing functional coatings via rational design of diatomite with hierarchical structures.</p> Graphical Abstract <p></p>

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A robust superhydrophobic ZnO@diatomite/epoxy coating for long-term corrosion-resistant magnesium alloys in marine environments

  • 期刊论文

  • 发表日期：

    2025年11月2日

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  • Shike Ren,
  • Yuan Wang,
  • Tengle Wang,
  • Ge He,
  • Shaojun Yuan

摘要

Abstract

The corrosion of magnesium (Mg) alloys is detrimental to marine ships, pipelines, transportation, etc. Although superhydrophobic surfaces can effectively protect against corrosion by maintaining an air gap between the solid structure and corrosive media, their long-term corrosion resistance remains limited due to the intrinsic properties of the base materials. Herein, we developed a novel superhydrophobic composite coating with superior corrosion resistance by spraying a mixture of superhydrophobic particles, hexadecyltrimethoxysilane (HDTMS)-modified ZnO nanosheet-decorated diatomite (ZnO@DME/HDTMS), and epoxy resin (E51) onto the surface of AZ31B Mg alloy. The resulting ZnO@DME/HDTMS composite coating exhibited outstanding stability and retained its superhydrophobicity over a wide temperature range (0–200 °C). Moreover, the coating demonstrated excellent adhesion and mechanical robustness in tape-peeling and friction tests. Compared to coatings without superhydrophobic particles, the ZnO@DME/HDTMS composite coating showed significantly lower corrosion rates and enhanced overall corrosion resistance in a 3.5 wt% NaCl solution, simulating marine environments. This work not only offers a superhydrophobic composite coating for the anticorrosion of Mg alloys in marine environments, but also gives a new strategy for preparing functional coatings via rational design of diatomite with hierarchical structures.

Graphical Abstract