| XIA An-nan,HAO Xiu-qing,ZHONG Guo-zheng,HE Yan-ru,ZHOU Jin-tang.Preparation of Hydrophobic Structure of Carbonyl Iron-Epoxy Resin Based Absorbing Material and Its Corrosion Resistance and Absorbing Properties[J],51(5):312-324 |
| Preparation of Hydrophobic Structure of Carbonyl Iron-Epoxy Resin Based Absorbing Material and Its Corrosion Resistance and Absorbing Properties |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.05.032 |
| KeyWord:absorbing material hydrophobic microstructure corrosion resistance picosecond laser processing micro milling microwave absorption property |
| Author | Institution |
| XIA An-nan |
College of Mechanical & Electrical Engineering,Nanjing , China |
| HAO Xiu-qing |
College of Mechanical & Electrical Engineering,Nanjing , China |
| ZHONG Guo-zheng |
College of Mechanical & Electrical Engineering,Nanjing , China |
| HE Yan-ru |
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHOU Jin-tang |
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| In order to improve the corrosion resistance and electromagnetic wave absorption properties of carbonyl iron- epoxy resin based electromagnetic wave absorbing material without changing the material in Marine environment, a method of preparing composite hydrophobic microstructures on the surface of carbonyl iron-epoxy resin composite material by picosecond laser processing and micro milling was proposed in this paper. The effects of picosecond laser processing power, scanning speed and scanning times on the contact angle of the fabricated structures were investigated by single factor experiments when the grid spacing was 30 μm and 20 μm respectively. The structure morphology after laser processing was analyzed by scanning electron microscope, and the contact angle of the surface prepared under various laser processing parameters was measured to select the laser processing parameters with better hydrophobic performance and high processing efficiency. The experimental results showed that when the grid spacing was 20 μm, the laser pulse frequency was 300 kHz, the spot diameter was 20 μm, the pulse width was 10 ps, the wavelength was 532 nm, the laser power was 3.5 W, and the laser scanning speed was 1 000 mm/s, besides, when the number of laser scanning was 10, the static water contact angle of the surface can reach 143°, which were the picosecond laser processing parameters finally selected. The micro milling cutters with different diameters were used to conduct the micro milling for the surface machined with the selected laser parameters to obtain the composite hydrophobic structure, which was observed by confocal microscopy and optical microscopy. According to the hydrophobic performance and machining efficiency of the composite structure, a micro milling cutter with a diameter of 0.2 mm was selected, and the contact angle of the composite structure can reach 137.5° with higher processing efficiency. The corrosion resistance of unprocessed samples, picosecond laser processed samples, micro milling processed samples and composite processed samples in 5wt.% NaCl solution was compared by corrosion resistance test. The test results showed that both combined processing and picosecond laser processing can improve the corrosion resistance of the material, and the material has no obvious corrosion traces even after soaking in 5wt.% NaCl solution for five days. In addition, EDS analysis showed that the composite structure can reduce the loss of carbonyl iron on the surface and prolong the service life of the absorbing material. The electromagnetic wave absorption capacity of each structure was measured by vector network analyzer. According to the absorbing performance test, the composite structure can better improve the absorbing performance of the material, and the maximum reflection loss of the absorbing material can be increased from–36.5 dB to –45.2 dB. The composite hydrophobic structure prepared by picosecond laser and micro-milling on the surface of carbonyl iron-epoxy resin based electromagnetic wave absorbing material can improve its corrosion resistance and electromagnetic wave absorption capacity in Marine environment. This paper is of great significance to the improvement of anti-corrosion and absorbing properties of absorbing materials used in the ocean, and also provides a new research direction for the application and function of hydrophobic structures. |
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