CAJ | 학술논문

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Y2 O3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Y2 O3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。
목적：채용함과립전해액시목전최상용제비구유경가성능미호양화막층적방법지일，주요연구미호양화과정중과립참잡여전원모식적관계。방법재Y2 O3과립질량농도위0~10 g/L적전해액중，분별이단겁맥충화쌍겁맥충전원모식제비일계렬미호양화막층，병종표면형모、표면원소조성、절면형모급내식성능등방면대막층진행종합평개。결과분산재전해액중적과립대유부전하，재미호양화과정중발생전영현상。재단겁맥충전원모식하，과립수정전흡인이발생정향천이，재시양부근취집병차흡부지표면，종이삼여하일보적미호양화막층형성과정。수착전해액중과립농도적제고，분산재미호양화막층표면적Y2 O3과립수량증다，막층표면적Y원소함량증가，막층변득치밀，내식성능인이제고。재쌍겁맥충전원작용하，유우전장적교체변화，과립난이취집재시양주위，과립적참잡지능통과수궤용융포복진행，인이삼여도미호양화과정중적과립수량교소。결론과립참잡수전장력영향，재단겁맥충모식하，과립적참잡농도대막층적성능영향명현；재쌍겁맥충전원모식하，부향전류적인입불리우과립참잡지양화막층，과립적참잡농도대막층적성능영향불명현。
ABSTRACT:Objective Particles-containing electrolytes are commonly employed as one of the most important methods to produce better micro arc oxidation coatings. The relationship between the MAO coating property and power mode used was described in this paper. Methods Ceramic coatings were produced by micro arc oxidation in electrolyte containing various particles concentration in unipolar and bipolar power mode, respectively. The properties of coatings were evaluated in respect of surface morphologies, ele-mentary distribution, cross-section morphologies, and corrosion resistance. Results The particles dispersed in electrolyte were nega-tively charged, and particles-doping during MAO process was driven by electrophoresis. Particles were directly migrated to the anode in unipolar power mode, accumulating around the sample and adsorbed to the sample surface to participate in the formation process of the micro arc oxidation coatings. With increasing particles concentration in electrolyte, the amount of Y2 O3 particles and the con-tent of Y element on the surface of the MAO coatings increased, enhancing the density and corrosion resistance of the coatings. However, only a few particles doped in MAO coating as the power mode turned to bipolar due to alternate variations of electric field. The influences of particles concentration on the surface and cross-section morphologies, surface elementary distribution, cor-rosion resistance of MAO coatings were not apparent. Conclusion Particles-doping was affected by electric force. In unipolar power mode, the doping concentration of particles had obvious effect on the performance of the coatings, whereas in the bipolar power mode, introduction of negative current had adverse effect on the doping of particles into the oxidation coatings, and the doping con-centration of particles had no obvious effect on the coating performance.