Title

Inorganic/organic bilayer of silica/acrylic polyurethane decorating FeSiAl for enhanced anti-corrosive microwave absorption

Publication Name

Applied Surface Science

Abstract

Corrosive ions with immense penetrating ability often invalidate the traditional microwave absorber as well as cause severe corrosion. Herein, an inorganic/organic bilayer structure of silicon dioxide/polyurethane-acrylic (SiO2@PUA) is developed layer by layer on FeSiAl surface for addressing the dual-function of microwave absorption and anti-corrosion properties. The bilayer structure possesses the inorganic SiO2 layer with physical barrier function and organic outer layer (PUA) of hydrophobic nature. The as-prepared FeSiAl@SiO2@PUA composite structure filled with 20 wt% of paraffin wax displays a maximum reflection loss of −49 dB at 5.8 GHz, and a broad effective absorption bandwidth reaches 7.8 GHz (10.2–18 GHz) at 2.5 mm thickness. Besides, the corrosion behavior of FeSiAl, FeSiAl@SiO2, and FeSiAl@SiO2@PUA is investigated by immersing in a corrosive environment and electrochemical testing. Due to the multi-level protection of SiO2/PUA bilayer, the FeSiAl@SiO2@PUA is immersed in an alkaline salty environment (pH = 12) for 3930 h and the corresponding corrosion potential significantly increases from −0.166 to −0.047 V, indicating the enhanced anti-corrosion with relatively low corrosion current 2.16 × 10-6 A/cm2 and corrosion rate (6.94 × 10-13 m/s). The designing inorganic/organic hybrid structure provides an effective strategy to enhance the dual-function of microwave absorption and anti-corrosion and its application at the commercial level.

Open Access Status

This publication is not available as open access

Volume

567

Article Number

150829

Funding Number

2020JDRC0015

Funding Sponsor

Sichuan Province Science and Technology Support Program

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.apsusc.2021.150829