| Steel corrosion is the main cause of the severe degradation of massive infrastructure durability. Impressed current cathodic protection is an important measure to active control of metal material corrosion. Anodic materials aging in cathodic corrosion protection system seriously affect the corrosion protection effect. In addition, important civilian facilities and special military engineering urgently need to develop multi-functional cathodic corrosion control system with electromagnetic shielding and acoustic stealth performance. Therefore, the electronic and ionic conductivity, electromagnetic shielding and acoustic stealth flexible multi-function composite material was prepared in this paper.First of all, we determined 5 ideal ratios of constituents A and B in the matrix, based on the characteristics of flexible, dispersing evenly and shaping easily. We finished the tensile and compression performance tests to the 5 kinds matrix. The ultimate tensile rate of each ratio matrix can reach 88%, showing materials with good tensile properties. Ultimate tensile stress is influenced by both A and B content, the closer of the dosage of A and B the bigger of the ultimate tensile stress. When A and B have the same dosage(i.e. 10:4:4), ultimate tensile stress maximum is 2.16 k Pa. Then we measured compressive stress and strain relationship of material by digital image correlation method. With the increase of strain, stress and strain ratio is gradually reduced, with obvious creep. When the dosage of A equals to B, it has a greater contribution to the performance of substrate material.Secondly, ionic conductivity of composite materials was tested. Taking advantage of A space mesh and B interlayer structure, mortar board which is full water plays as contrast test, we test the chloride ion penetration property under the effect of electromigration of the 5 kinds samples basing on the principle of electric flux testing method in concrete. The result showed that the electric flux of our material is about 2 times of mortar board, and the chloride ion penetration is also precede mortar board. The one with 369.456 C electric flux has the best ion permeability is 2# matrix with ratio 10:3:5. With B proportion increase, the permeability of chloride ions also increase accordingly. Using molecular dynamics reveals the interaction of A and B, the effects of matrix to chlorine ions, and get the diffusion coefficient of chlorine in the matrix.Once again, by adding carbon fiber, carbon black and carbon nanotubes multi-scale carbon-based materials, enhances the anode electronic conductivity of the composite material. we tested out resistivity seepage curve of 0% ~ 8%(% is the percent of carbon-based materials to the total quality of A and B) carbon-based materials adding to 2# matrix with the best ionic conductivity ratio 10:3:5 via four electrode test method. The results showed that material resistivity overall is down with the dosage of carbon material increasing. When the carbon material is 2.4%-2.8%, there is a sudden drop in resistivity, from 22.077Ω?m sharply fall to 2.247Ω?m. Then as the dosage of carbon material increase the fall of resistivity is not so obvious, so we treat 2.8% as the content of the economy. Next we measure d the electromagnetic shielding performance in frequency 3.22-18 GHz of 3 kinds samples those are:2# matrix only, 2# matrix with 2.8% of carbon material and laying carbon nanopaper on surface additionally. The results showed that anode material with 2.8% carbon-based materials has a higher shielding effectiveness(SE). The highest value of SE up to 100 d B.Finally, waveguide method was used to test the sound adsorption performance of the determined 5 kinds matrix materials with ratios 10:3:4, 10:3:5, 10:4:3,10:4:4,10:4:5 of H2 O,A,B. In frequency 560-600 Hz, their acoustical absorption coefficient is above 0.2, while which is only 0.05 in other frequency. Then the 2.8% carbon-based anode material was used to test ion permeability and sound absorption, which were compared with the matrix in the meantime. The results showed that the ionic conductivity was slightly lower than base material, sound absorption performance was consistent with the base material. We also tested the tensile sensitive of multi-functional composite anode material and studied out the relation between the resistance value and stretch rate of material. Result showed that the multifunction composite anode material can apperceive the large stretch strain of 1 million micro strain. Through the above research, the multifunction flexible composite anode material for comprehensive performance with ion and electronic conductive jointly, electromagnetic shielding performance and sound stealth is prepared. |
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