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在NaAlO2体系溶液中添加不同浓度的NaF,对SiC增强铝基复合材料进行微弧氧化处理。研究了电压上升及陶瓷层生长速率随NaF浓度的变化规律;对所获得的陶瓷层用扫描电镜进行形貌及结构观察;用电化学工作站进行极化曲线测试;用X射线衍射仪对膜层相组成进行分析。结果表明:当NaF浓度为1 g/L时,电压上升最快,陶瓷层生长速率最快,所获得的膜层致密性较好,耐蚀性能也最好。
Different concentration of NaF was added into the solution of NaAlO2 system to micro-arc oxidation of SiC reinforced aluminum matrix composites. The change of voltage and the growth rate of ceramic layer with the concentration of NaF were studied. The morphology and structure of the obtained ceramic layer were observed by scanning electron microscopy. The polarization curve of the ceramic layer was tested by X-ray diffractometer. Phase composition for analysis. The results show that when the concentration of NaF is 1 g / L, the voltage rises fastest and the growth rate of ceramic layer is the fastest. The obtained film has better compactness and corrosion resistance.