论文部分内容阅读
采用磁控溅射镀铝与化学转化复合处理的方法对AZ91D镁合金表面进行处理,制得复合处理膜层,并与单纯磁控溅射镀铝膜层的耐蚀性进行了比较。结果表明,磁控溅射所得铝膜层结构致密,铝膜层与镁合金基体界面形成混合过渡层。沉积铝膜后再进行阿洛丁化学转化所得膜层表面存在裂纹,化学转化膜与铝膜之间结合良好。磁控溅射铝膜层使镁合金的腐蚀速率加快。镀铝与化学转化复合处理所得膜层的腐蚀电流密度比镁合金基体低1个数量级以上,表明镀铝与化学转化复合处理可明显提高镁合金的耐蚀性。中性盐雾试验4h后,铝膜表面腐蚀严重;而复合处理膜层在试验24h后表面只出现少量的腐蚀,48h后只有5%的面积被腐蚀。
The surface of AZ91D magnesium alloy was treated by magnetron sputtering aluminum plating and chemical conversion composite treatment, and the composite treatment film was prepared and compared with the pure magnetron sputtering aluminum coating corrosion resistance. The results show that the structure of the aluminum film obtained by magnetron sputtering is compact and the interface between the aluminum film and the magnesium alloy matrix forms a mixed transitional layer. After the deposition of aluminum film, the surface of the film obtained by the chemical conversion of Alodin is cracked, and the chemical conversion film is well bonded with the aluminum film. Magnetron Sputtering aluminum film to magnesium alloy corrosion rate. Corrosion current density of the film obtained by composite treatment of aluminum plating and chemical conversion is more than one order of magnitude lower than that of the magnesium alloy substrate, indicating that the combination of aluminum plating and chemical conversion treatment can obviously improve the corrosion resistance of the magnesium alloy. After the neutral salt spray test for 4h, the surface of the aluminum film corroded seriously. However, only a small amount of corrosion appeared on the surface of the composite film after 24h and only 5% of the area was eroded after 48h.