论文部分内容阅读
在不同电流密度下制备了ZL108 Na2WO4改性微弧氧化膜,研究了电流密度对Na2WO4改性微弧氧化膜特性的影响。利用扫描电镜(SEM)观察氧化膜表面形貌,能谱仪(EDS)、X射线衍射仪(XRD)以及X射线光电子能谱(XPS)分别测试了氧化膜截面元素分布、相组成以及W的化合价,极化曲线测试了耐蚀性。结果表明,随电流密度增大,微弧氧化膜由致密变为多孔,微孔数量增加、尺寸变大,膜层增厚。膜层中W、O含量增加,Al含量下降。微弧氧化膜由γ-Al2O3、Al和Si 3个相组成,W元素在膜中主要以WO3形式存在。微弧氧化膜的耐蚀性随电流密度增加而提高。
ZL108 Na2WO4 modified MAO films were prepared at different current densities, and the effects of current density on the properties of MAO modified by Na2WO4 were studied. The surface morphology of the oxide film was observed by scanning electron microscopy (SEM), EDS, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to test the elemental distribution, phase composition and W The valence, polarization curves were tested for corrosion resistance. The results show that with the increase of current density, the micro-arc oxidation film changes from dense to porous, the number of micro-pores increases, the size becomes larger and the thickness of the film increases. W, O content in the film increases, Al content decreased. Micro-arc oxidation film consists of γ-Al2O3, Al and Si 3 phase composition, W element in the film mainly in the form of WO3. The corrosion resistance of MAO films increases with the increase of current density.