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利用微弧氧化技术在ZL205A铝合金表面制备陶瓷层;用扫描电镜对膜层形貌及结构进行观察,分析了膜层典型形貌的形成过程;用X射线衍射仪对膜层相组成进行分析;对不同厚度微弧氧化膜层的试样进行盐雾试验。结果表明:所制得的膜层由α-Al2O3、γ-Al2O3及δ-Al2O3组成;膜层厚度小于30μm时,耐蚀性能随着膜层厚度的增大提高明显,当膜厚为30～50μm时,耐蚀性能随着膜厚的增加提高幅度减小,膜厚大于50μm时,其耐蚀性能变化不明显。
The ceramic layer was prepared on the surface of ZL205A aluminum alloy by micro-arc oxidation. The morphology and structure of the film were observed by scanning electron microscopy. The formation of typical morphology of the film was analyzed. The phase composition of the film was analyzed by X-ray diffraction ; Salt spray test on the sample with different thickness of micro-arc oxidation film. The results show that the film is composed of α-Al2O3, γ-Al2O3 and δ-Al2O3. When the film thickness is less than 30μm, the corrosion resistance increases obviously with the increase of film thickness. When the film thickness is 30 ~ 50μm, the corrosion resistance decreases with the increase of the film thickness. When the film thickness is more than 50μm, the corrosion resistance does not change obviously.