【摘要】：為改善鋁合金表面潤濕性與膠接強(qiáng)度,采用常壓空氣射流等離子體對5052鋁合金進(jìn)行表面處理。通過接觸角測試,表面自由能計算和膠接接頭剪切強(qiáng)度測試表明處理時間對鋁合金表面改性效果影響不大,隨著處理距離減短,鋁合金表面自由能、膠接接頭強(qiáng)度均逐步提升。處理距離為5 mm時等離子處理鋁合金獲得最佳表面改性效果,鋁合金膠接接頭剪切強(qiáng)度由10.6 MPa提升至19.3 MPa,失效模式由界面失效轉(zhuǎn)變?yōu)閮?nèi)聚失效。利用SEM,XPS,傅立葉變換紅外光譜等檢測手段分析不同處理距離對應(yīng)表面理化特性的變化,結(jié)果表明:處理距離較遠(yuǎn)時,等離子體并未改變鋁合金表面物理形貌,其主要改性效果體現(xiàn)為表面清洗;處理距離較近時,鋁合金表面高溫熔融產(chǎn)生復(fù)雜微結(jié)構(gòu)的粗糙氧化層,同時氧化層表面吸附羥基等極性官能團(tuán),顯著提升了其表面自由能與膠接強(qiáng)度。
[Abstract]:In order to improve the wettability and bonding strength of aluminum alloy surface, the surface of 5052 aluminum alloy was treated by atmospheric pressure air jet plasma. The calculation of surface free energy and shear strength test of adhesive joint show that the treatment time has little effect on the surface modification of aluminum alloy. With the reduction of treatment distance, the surface free energy of aluminum alloy and the strength of adhesive joint are increased gradually. When the treatment distance is 5 mm, the best surface modification effect is obtained by plasma treatment. The shear strength of adhesive joint of aluminum alloy is increased from 10.6 MPa to 19.3 MPA, and the failure mode is changed from interface failure to cohesive failure. The physical and chemical properties of aluminum alloy surface were analyzed by means of SEMS-XPS and Fourier transform infrared spectroscopy. The results showed that the plasma did not change the physical morphology of aluminum alloy surface when the treatment distance was longer. The main modification effect is surface cleaning. When the surface of aluminum alloy is close, rough oxidation layer with complex microstructure is produced by melting at high temperature, and polar functional groups such as hydroxyl groups are adsorbed on the surface of oxidation layer. The surface free energy and adhesive strength are improved significantly.
【作者單位】： 同濟(jì)大學(xué)機(jī)械與能源工程學(xué)院;同濟(jì)大學(xué)上海市地面交通工具空氣動力與熱環(huán)境模擬重點實驗室;陶氏化學(xué)(中國)投資有限公司;
【基金】：國家自然科學(xué)基金(51575397)~~
【分類號】：TG49

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