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对异型工件盲孔微弧氧化不均匀性进行了研究。结果表明,盲孔内壁膜厚分布很不均匀,由孔口到孔底膜厚逐渐减小,且最大膜厚与最小膜厚相差可达10μm,膜厚降低了85.6%。膜层的不均匀性是由于盲孔内部电场的屏蔽和溶液交换较差协同作用引起的。盲管试件内壁相结构基本相同,只是衍射峰的强弱有所差别,而表面形貌却表现出了很大程度的不均匀现象。为了提高微弧氧化的均匀性,分别采用了在盲孔内部通入循环电解液、引入辅助电极以及两者同时引入的方法进行微弧氧化处理。结果表明在盲孔内部引入辅助电极同时通入循环电解液使得试件内壁膜厚不均匀程度显著减小,与原始处理相比不均匀性减小67%,电流测试也有着同样的变化趋势。
The heterogeneity of micro-arc oxidation of the blind hole in profiled workpieces was studied. The results show that the distribution of film thickness on the inner wall of the blind hole is very uneven. The thickness of the film decreases from the hole to the bottom of the hole, and the difference between the maximum film thickness and the minimum film thickness is up to 10μm and the film thickness is reduced by 85.6%. The nonuniformity of the film is due to the poor synergy between the shielding of the electric field inside the blind hole and the solution exchange. The structure of the inner wall of the blind pipe specimen is basically the same, but the strength of the diffraction peak is different, while the surface topography shows a large degree of non-uniform phenomenon. In order to improve the uniformity of the micro-arc oxidation, micro-arc oxidation was carried out by introducing the circulating electrolyte inside the blind hole, introducing the auxiliary electrode and introducing both simultaneously. The results show that introducing the auxiliary electrode into the blind hole and introducing the circulating electrolyte into the blind hole significantly reduce the unevenness of the thickness of the inner wall of the test piece, reducing the inhomogeneity by 67% as compared with the original treatment. The current test also has the same trend.