【摘要】 采用不对称正负脉冲电流方法对LF21铝合金硬质阳极氧化进行了研究,结果表明,当脉冲阳极电流与阴极电流比为5∶1,阳极与阴极电流周期比为5∶1,平均氧化电流密度为2.5A/dm2时,所获得的膜层显微硬度大于500HV,膜层表面光滑致密。与直流或直流叠加脉冲阳极氧化相比,不对称正负脉冲硬质阳极氧化技术具有成膜速度快、膜层硬度高、电解温度范围宽、能耗少等优点。更多还原

【Abstract】 Hard anodizing process of LF21 aluminum alloy using asymmetric pulse current method was studied. The results showed that the films obtained have microhardness more than 500 HV and their surface is smooth and compact when both the ratio anodic current to cathodic current and the ratio of anodic duration to cathodic duration were 5∶1, and the average anodic current density was 2.5 A/dm2? Compared with DC method and DC overlapping pulse current method, the films prepared by asymmetric pulse current method have the advantages such as a rapid depositing rate, a wide scope of electrolysis temperature, high hardness of the films and low energy consumption of the process.更多还原