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本研究在分析微弧氧化不同火花阶段宏观反应现象和生成膜层特征的基础上,建立白色火花放电和红色火花放电等离子源形成模型。阐明不同火花放电阶段形成放电火花的等离子体源的产生机制:白色火花放电阶段的等离子体源是电子轰击膜层表面包裹的气泡层而形成;而在红色火花放电阶段多次放电后造成金属正电极、溶液等效负电极上的尖端凸起延伸到膜层内部,同膜层中封闭的气孔一起在电场中形成强电场区,当强电场中绝缘介质极化达到极限时就形成了放电等离子源。
In this study, based on the analysis of the macro-reaction phenomena and the characteristics of the film formed during the different spark stages of micro-arc oxidation, a white spark discharge and a red spark discharge plasma source formation model were established. To clarify the mechanism of plasma source formation for spark discharge at different spark discharge stages: the plasma source in the white spark discharge stage is formed by the electron bombardment of the bubble layer wrapped on the surface of the film layer; after being discharged in the red spark discharge stage, the metal positive The tips of the electrodes and the solution-equivalent negative electrode extend to the inside of the film. The closed pores in the film together form a strong electric field in the electric field. When the polarization of the dielectric in the strong electric field reaches the limit, a discharge plasma is formed source.