论文部分内容阅读
负向电压对微弧氧化陶瓷膜形成有极其重要的影响。电解液组成变化时,负向电压也必须作相应调整,才能确保微弧氧化过程的稳定和氧化膜的质量。在含mSiO2·nH2O的KOH复合电解液中,在负向电压60~140 V的条件下对ZAlSi12Cu2Mg1合金进行微弧氧化。采用电涡流测厚仪、SEM和XRD对陶瓷膜进行表征,研究了负向电压对厚度、表面形貌、相组成及耐磨性的影响。结果表明:随着负向电压增大,膜厚增加,膜层中有显微裂纹存在;负向电压为120 V时,膜厚达到186.7μm,耐磨性好。膜层主要由Mullite及α-Al2O3相组成,但衍射谱中α-Al2O3相峰强较高。
Negative voltage on the micro-arc oxidation ceramic film has an extremely important impact. Electrolyte composition changes, the negative voltage must be adjusted accordingly, in order to ensure the stability of the micro-arc oxidation process and the quality of the oxide film. In the KOH composite electrolyte containing mSiO2 · nH2O, the ZAlSi12Cu2Mg1 alloy was micro-arc oxidized under the negative voltage of 60 ~ 140V. The ceramic films were characterized by eddy current thickness gauge, SEM and XRD. The effects of negative voltage on the thickness, surface morphology, phase composition and wear resistance were studied. The results show that with the increase of the negative voltage, the film thickness increases and micro cracks exist in the film. When the negative voltage is 120 V, the film thickness reaches 186.7 μm and the wear resistance is good. The film mainly consists of Mullite and α-Al2O3 phases, but the peak intensity of α-Al2O3 phase in the diffraction spectrum is relatively high.