铝合金直流电阳极氧化膜的制备

Anodic Oxide Coating Preparation of Aluminum Alloy With Dirrect Current

以工业纯铝L2为试样,对其表面经预处理后进行直流电阳极氧化,考察了氧化时间、氧化电压对氧化膜厚度、膜硬度的影响,并对经阳极氧化的试样横截面进行SEM和EDS测试分析。研究结果表明,在电解液成分H_2SO_4的质量浓度为200 g/L、Al_2O_3的质量浓度为1 g/L,直流氧化电压为10 V,氧化时间为40 min,温度为(20±1)℃的条件下,可以获得均匀、与试样基体结合紧密、膜硬度相对较高的的氧化膜。而且随着氧化时间的增加,可以得到相对较大的膜厚度,但膜硬度相对降低。

As sample,industrial pure aluminum L2 after surface preparation and anodic oxide coating with D.C.was studied. The effect of oxidation time and voltage on thickness and hardness of anodic oxide coating was discussed.The results of SEM, EDS and analysis of the cross section of the sample coated oxide film show that optimal condition of anodic oxide coating preparations are as follows：200 g/L H_2SO_4,1 g/L Al_2O_3,D.C.10 V,40 min oxidant time,（20±1）℃.Under this condition,uniform,harder and tighter with the basal body of the sample can be obtained.Moreover,it was found that the film is become thicker and the hardness is deceased with increasing the oxidant time.