SiC_P/2024铝基复合材料表面微弧氧化膜组织结构及其耐蚀性  

Microstructure and corrosion-resistance of microarc oxidation film on SiC_P/2024 aluminum matrix composite

作　　者：薛文斌[1] 吴晓玲[1] 施修龄[1] 李夕金[1] 田华[1] 

机构地区：[1]北京师范大学低能核物理研究所射线束材料改性开放实验室,北京100875

出　　处：《复合材料学报》2006年第6期98-102,共5页Acta Materiae Compositae Sinica

基　　金：北京市科技新星计划(9558102500);国家自然科学基金(59801003);北京市留学人员科技活动项目

摘　　要：对SiCP/2024铝基复合材料进行微弧氧化表面处理,分析了陶瓷膜截面的显微组织、成分分布,测量了其相组成和硬度分布,并比较了氧化前后极化曲线的变化。结果表明,在硅酸盐溶液中获得的陶瓷膜由莫来石、α-Al2O3、γ-Al2O3晶态相和SiO2非晶相组成,残留的SiC增强体很少,膜与复合材料呈现良好的冶金结合。膜具有两层结构,外层Si含量较高并主要来自电解液,而内层膜里莫来石的形成同SiC增强体氧化密切相关。微弧氧化处理后,SiCP/2024铝基复合材料的抗腐蚀能力得到很大提高,这归因于形成了一层完整连续的氧化膜。SiCp reinforced aluminum matrix composites were treated by microarc oxidation method. The microstructure and composition of ceramic film were analyzed, and the phase constituent and microhardness profile were also measured. The corrosion behavior of the composite was evaluated by polarization test. The ceramic film deposited in silicate electrolyte consists of mullite, α-Al2O3 , γ-Al2O3 and amorphous SiO2 phases. A few residual SiC particles were remained in the film close to the film/composite interface. The silicon content in the outer layer film is rather high, which mainly comes from the electrolyte, while the mullite synthesis in the inner layer film is related to the oxidation of SiC reinforcements in the plasma discharge channel. After the microarc oxidation surface treatment, the corrosion resistance of the SiCp/2024 composite was significantly improved due to the formation of a continuous thick film.

关 键 词：微弧氧化 铝基复合材料 陶瓷膜 耐蚀性 

分 类 号：TG174.45[金属学及工艺—金属表面处理]