Y_(2)O_(3)用量对5A06铝合金微弧氧化膜层特性的影响

Effect of Y_(2)O_(3)Dosage on Properties of Micro-arc Oxidation Coatings on 5A06 Aluminum Alloy

在Na2B4O7电解液中加入稀土氧化物Y_(2)O_(3)颗粒添加剂,在此电解液下对5A06铝合金进行微弧氧化处理,借助扫描电镜和莱卡金相显微镜等设备对膜层微观形貌、显微硬度、膜层厚度进行测试和分析,得知Y_(2)O_(3)颗粒进入膜层表面放电通道形成的微小气孔中起到封孔的作用。结果表明:随稀土氧化物Y_(2)O_(3)浓度的增加,膜层厚度和粗糙度值逐渐增加,而膜层的显微硬度先增加后降低,当稀土氧化物Y_(2)O_(3)浓度为10g/L时,膜层硬度最高达HV939,添加氧化物Y_(2)O_(3)为10g/L的试样磨损3000转后质量损失相对较小,较基体磨损质量大约减少了0.026g。

The rare earth Y_(2)O_(3)particle additive is added into Na2B4O7 electrolyte,and the 5A06 aluminum alloy was treated by micro-arc oxidation in this electrolyte.the microscopic morphology,microhardness and thickness of the film were tested and analyzed by means of scanning electron microscope and Leica metallographic microscope.it was found that Y_(2)O_(3)particles played a role in sealing pores formed by discharge channels on the surface of the film.The results show that with the increase of Y_(2)O_(3)concentration,the thickness and roughness of the film gradually increase,while the microhardness of the film first increases and then decreases.When the concentration of Y_(2)O_(3)is 10g/,the hardness of the film is as high as HV939,The wear loss of adding Y_(2)O_(3)10g/l specimens at 3000 RPM is relatively small and about 0.026 g lower than that of Matrix。