Applied Surface Science ( IF 6.7 ) Pub Date : 2021-08-03 , DOI: 10.1016/j.apsusc.2021.150829 Ying Pan 1 , Jinyao Li 1 , Ziyi Liu 1 , Ruiquan Yang 1 , Yifan Liu 1 , Liangjun Yin 1 , Huakun Liu 2 , Xian Jian 1, 3
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.
中文翻译:
无机/有机双层二氧化硅/丙烯酸聚氨酯装饰 FeSiAl 以增强抗腐蚀微波吸收
具有极强穿透能力的腐蚀性离子常常使传统的微波吸收剂失效,并造成严重的腐蚀。在此,在 FeSiAl 表面逐层开发了二氧化硅/聚氨酯-丙烯酸(SiO 2 @PUA)的无机/有机双层结构,以解决微波吸收和防腐性能的双重功能。双层结构具有具有物理屏障功能的无机SiO 2层和疏水性的有机外层(PUA)。所制备的 FeSiAl@SiO 2填充有 20 wt% 石蜡的 @PUA 复合结构在 5.8 GHz 下的最大反射损耗为 -49 dB,并且在 2.5 mm 厚度下有效吸收带宽达到 7.8 GHz (10.2-18 GHz)。此外,通过浸入腐蚀环境和电化学测试研究了FeSiAl、FeSiAl@SiO 2和 FeSiAl@SiO 2 @PUA的腐蚀行为。由于SiO 2 /PUA双层的多级保护,FeSiAl@SiO 2 @PUA在碱性咸环境(pH=12)中浸泡3930 h,相应的腐蚀电位从-0.166 V显着增加到-0.047 V , 表明具有较低腐蚀电流 2.16×10 -6 A/cm 2的增强防腐和腐蚀速率(6.94×10 -13 m/s)。设计无机/有机杂化结构为增强微波吸收和防腐的双重功能及其在商业层面的应用提供了有效的策略。