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。
Abstract:
SiCP reinforced aluminum mat rix composites were t reated by microarc oxidation method. The micro-structure and composition of ceramic film were analyzed , and the phase constituent and microhardness profile werealso measured. The corrosion behavior of the composite was evaluated by polarization test . The ceramic film deposi2ted in silicate elect rolyte consist s of mullite ,α-Al2O3 , γ-Al2O3 and amorphous SiO2 phases. A few residual SiCParticles were remained in the film close to the film/ composite interface. The silicon content in the outer layer film israther high , which mainly comes f rom the elect rolyte , while the mullite synthesis in the inner layer film is related tothe oxidation of SiC reinforcement s in the plasma discharge channel. Af ter the microarc oxidation surface t reatment ,the corrosion resistance of the SiCP/ 2024 composite was significantly improved due to the formation of a continuousthick film.
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