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常温下采用化学浸渍法在1070铝合金表面获得了锆-聚天冬氨酸复合转化膜(复合膜)。通过电化学阻抗谱和中性盐雾试验考察了膜层的耐蚀性。采用扫描电镜、能谱仪和X射线光电子能谱仪分析了膜层的形貌、结构和化学组成。结果表明,在由0.1~0.3 g/L硼酸、0.1~0.5 g/L氟硼酸和0.5~1.0 g/L组成的氟锆酸锆转化液中加入0.5~1.0 g/L聚天冬氨酸钠,所得复合膜较未加聚天冬氨酸钠时更致密,耐蚀性更好。涂覆上某市售环氧粉末涂料后,所得涂层的综合性能更好。探讨了复合膜的成膜机理。
The zirconium-polyaspartic acid composite conversion coating (composite membrane) was obtained on the surface of 1070 aluminum alloy by chemical impregnation method at room temperature. The corrosion resistance of the coating was investigated by electrochemical impedance spectroscopy and neutral salt spray test. The morphology, structure and chemical composition of the film were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy. The results showed that 0.5-1.0 g / L sodium polyaspartate was added to the zirconium fluorozirconate conversion solution composed of 0.1-0.3 g / L boric acid, 0.1-0.5 g / L fluoboric acid and 0.5-1.0 g / L, , The resulting composite membrane more dense than the non-sodium polyaspartate, better corrosion resistance. After coating with a commercially available epoxy powder coating, the overall performance of the resulting coating is better. The film forming mechanism of the composite film was discussed.