镁合金微弧氧化过程中电源模式对颗粒掺杂的影响
发布时间：2019-05-08 06:55
【摘要】：目的采用含颗粒电解液是目前最常用制备具有更佳性能微弧氧化膜层的方法之一,主要研究微弧氧化过程中颗粒掺杂与电源模式的关系。方法在Y2O3颗粒质量浓度为0~10 g/L的电解液中,分别以单极脉冲和双极脉冲电源模式制备一系列微弧氧化膜层,并从表面形貌、表面元素组成、截面形貌及耐蚀性能等方面对膜层进行综合评价。结果分散在电解液中的颗粒带有负电荷,在微弧氧化过程中发生电泳现象。在单极脉冲电源模式下,颗粒受正电吸引而发生定向迁移,在试样附近聚集并且吸附至表面,从而参与下一步的微弧氧化膜层形成过程。随着电解液中颗粒浓度的提高,分散在微弧氧化膜层表面的Y2O3颗粒数量增多,膜层表面的Y元素含量增加,膜层变得致密,耐蚀性能因而提高。在双极脉冲电源作用下,由于电场的交替变化,颗粒难以聚集在试样周围,颗粒的掺杂只能通过随机熔融包覆进行,因而参与到微弧氧化过程中的颗粒数量较少。结论颗粒掺杂受电场力影响,在单极脉冲模式下,颗粒的掺杂浓度对膜层的性能影响明显;在双极脉冲电源模式下,负向电流的引入不利于颗粒掺杂至氧化膜层,颗粒的掺杂浓度对膜层的性能影响不明显。
[Abstract]:Aim the use of electrolyte containing particles is one of the most commonly used methods to prepare micro-arc oxide films with better performance. The relationship between particle doping and power supply mode in the process of micro-arc oxidation is mainly studied. Methods A series of micro-arc oxidation films were prepared by single-pole pulse mode and bipolar pulse mode in the electrolyte with Y2O3 particle concentration of 0-10 g / L, and the surface morphology and surface element composition were analyzed. The cross-section morphology and corrosion resistance of the films were evaluated comprehensively. Results the particles dispersed in the electrolyte had negative charge, and electrophoresis occurred in the process of micro-arc oxidation. In the monopole pulse power supply mode, the particles migrate directionally by the positive electric attraction, gather and adsorb to the surface near the sample, thus participate in the formation process of the micro-arc oxidation film in the next step. With the increase of particle concentration in electrolyte, the number of Y2O3 particles dispersed on the surface of micro-arc oxidation film increased, the content of Y element on the surface of the film increased, and the film became dense, so the corrosion resistance of the film was improved. Under the action of bipolar pulse power supply, due to the alternation of electric field, the particles are difficult to gather around the sample, the doping of particles can only be carried out by random melting coating, so the number of particles involved in the process of micro-arc oxidation is small. Conclusion the particle doping is affected by the electric field force. In unipolar pulse mode, the doping concentration of the particle has obvious effect on the performance of the film. In bipolar pulse power supply mode, the introduction of negative current is not conducive to the doping of particles into the oxide film, and the doping concentration of particles has little effect on the performance of the films.
【作者单位】： 北京化工大学;
【分类号】：TG174.4
[Abstract]:Aim the use of electrolyte containing particles is one of the most commonly used methods to prepare micro-arc oxide films with better performance. The relationship between particle doping and power supply mode in the process of micro-arc oxidation is mainly studied. Methods A series of micro-arc oxidation films were prepared by single-pole pulse mode and bipolar pulse mode in the electrolyte with Y2O3 particle concentration of 0-10 g / L, and the surface morphology and surface element composition were analyzed. The cross-section morphology and corrosion resistance of the films were evaluated comprehensively. Results the particles dispersed in the electrolyte had negative charge, and electrophoresis occurred in the process of micro-arc oxidation. In the monopole pulse power supply mode, the particles migrate directionally by the positive electric attraction, gather and adsorb to the surface near the sample, thus participate in the formation process of the micro-arc oxidation film in the next step. With the increase of particle concentration in electrolyte, the number of Y2O3 particles dispersed on the surface of micro-arc oxidation film increased, the content of Y element on the surface of the film increased, and the film became dense, so the corrosion resistance of the film was improved. Under the action of bipolar pulse power supply, due to the alternation of electric field, the particles are difficult to gather around the sample, the doping of particles can only be carried out by random melting coating, so the number of particles involved in the process of micro-arc oxidation is small. Conclusion the particle doping is affected by the electric field force. In unipolar pulse mode, the doping concentration of the particle has obvious effect on the performance of the film. In bipolar pulse power supply mode, the introduction of negative current is not conducive to the doping of particles into the oxide film, and the doping concentration of particles has little effect on the performance of the films.
【作者单位】： 北京化工大学;
【分类号】：TG174.4
【参考文献】
相关期刊论文 前2条
1 蒋百灵,吴国建,张淑芬,雷廷权;镁合金微弧氧化陶瓷层生长过程及微观结构的研究[J];金属热处理学报;2002年01期
2 杨眉;雷正;王平;欧r，
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