6061铝合金微弧氧化陶瓷层生长速度的研究

以变形铝合金6061为试验材料，采用MAO240／750微弧氧化设备、TT260测厚仪和JSM6460扫描电子显微镜，研究了电流密度、占空比、样品尺寸和溶液温度等因素对铝合金微弧氧化陶瓷层生长速度的影响。结果表明：陶瓷层厚度随着时间的延长而线性增大，电流密度越大，陶瓷层生长速度越快，在相同时间内样品表面所达到的电压越高，电压的升高提高了陶瓷层被击穿继续发生内部氧化的能力；占空比大小对陶瓷层生长速度几乎无影响，而电压随着占空比的减小发生微小的上升；恒流氧化时，虽然陶瓷层的生长速度不随样品尺寸变化，但是电压随样品尺寸增大而升高；随着溶液温度的升高，溶液的导电能力增强，陶瓷层的生长速度变快。

Growing Rate of Micro-arc Oxidation Coating on 6061 Aluminum Alloy

Using MAO240/750 Micro-arc Oxidation (MAO) equipment, TT260－Coating Thickness Gauge and JSM6460 Scanning Electronic Microscope, the influences of current density, duty cycle, sample dimension and solution temperature on growing rate of MAO coatings of 6061 Aluminum alloy have been investigated. The results indicate that the MAO ceramic thickness increases linearly with oxidation time; the higher the current density, the faster the growing speed of coating layer is and the higher the applied voltage at the same treatment time is. The higher voltage enhanced the ability to be broken down and to be continuous oxidized. Duty cycle nearly has no impact on the growing rate of coating. Voltage rises slightly with decreasing duty cycle. The growing speed of coating does not change with sample dimension, however the voltage increases with the increase of the sample size. The higher the temperature, the stronger the electricity conduction of solution is, and the faster the growing speed of ceramic layer is.