铝合金微弧氧化过程中电学参量的特性研究  

Study on the electrical parameter variation during microarc oxidation of aluminium alloys

作　　者：吴汉华[1,2] 龙北红[3,4] 吕宪义[3] 汪剑波[3] 金曾孙[3] 

机构地区：[1]吉林大学物理科学学院 [2]吉林大学超硬材料国家重点实验室,长春130023 [3]吉林大学超硬材料国家重点实验室 [4]吉林大学材料科学与工程学院,长春130012

出　　处：《物理学报》2005年第4期1697-1701,共5页Acta Physica Sinica

摘　　要：利用自制的数据采集系统研究了恒定电压下铝合金微弧氧化过程中有关电学参量随时间的变化规律 .结果表明 :通电回路中的阴极和阳极峰值电流随处理时间的变化明显分为 5个阶段 ;陶瓷膜的动态正向电阻和电阻率随处理时间分阶段变化 ,而动态的反向电阻和电阻率随时间的变化不大 .在微弧氧化过程中 ,各时刻的动态正、反向电阻值不同 ,一般情况下 ,动态正向电阻远大于反向电阻 .对不同处理时间样品的扫描电子显微镜分析表明 ,陶瓷膜呈多孔结构并随处理时间分阶段变化 .The variation of electrical parameters during microarc oxidation (MAO) of aluminium alloys at constant voltage has been studied by means of a laboratory-made data acquisition system. Experimental results show that the variations of the cathodic and anodic current amplitude and effective working current in an electrical loop with the duration of treatment show obviously five stages, and the variations of dynamic positive resistance and the rate of change of resistance in coatings also show different stages, while the variations of dynamic negative resistance and the rate of change of resistance with oxidation time are not evident. During the MAO process, the dynamic positive resistance is always not equal to the negative resistance, and the former is generally greater than the latter in general. Scanning electron microscopy analysis shows that the surface morphology of MAO coatings is macro-porous and its variations with treatment time are in steps.

关 键 词：铝合金 微弧氧化 电学参量 陶瓷膜 

分 类 号：TG174[金属学及工艺—金属表面处理]