制备参数对ZL104合金微弧氧化膜性能的影响

Influences of Preparation Parameters on Properties of Micro-Arc Oxidation Coatings Prepared on ZL104 Alloy

为弄清制备参数对铸铝合金微弧氧化处理的影响,通过改变主盐Na_2SiO_3的浓度、微弧氧化处理过程中的频率和电压,在铸铝ZL104合金表面制备了微弧氧化陶瓷膜。利用扫描电镜(SEM)观察了氧化膜的表面形貌,通过X射线衍射仪分析了膜层的相结构,采有显微硬度计测试了试样的硬度,并对样品进行了热冲击和耐蚀性检测。结果表明:提高电解液主盐Na_2SiO_3浓度及电压参数,微弧氧化膜的厚度及硬度相应增加,抗热冲击能力提高。Na_2SiO_3为10 g/L、电压为400 V条件下生成的膜层最厚,达到了14.0μm,此时硬度达到了最高值450 HV;而提高频率,膜层厚度由14.0μm下降至3.0μm,但耐蚀性提高,500 Hz下所制备的氧化膜耐蚀性最好。

Cailiao Baohu 2016,49( 02),17 ~ 20( Ch). Micro-arc oxidation coatings were prepared on ZL104 alloy by adjusting the concentrations of Na2 SiO 3,frequencies and voltages during micro-arc oxidation. The morphologies of the oxidation coatings were observed by scanning electron microscopy( SEM),and the phase structures of the coatings were analyzed by X-ray diffraction( XRD). Moreover,the hardness of coating was evaluated by microhardness tester, and the coatings were treated by thermal shock and corrosion resistance tests. Results showed that with the increase of the Na2 SiO 3concentration and voltage,the thickness and hardness of micro-arc oxidation coatings increased,and the thermal-shock resistance was improved. When the Na2 SiO 3concentration was 10 g/L and the voltage was 400 V,the thickness of coating was the maximum,up to 14. 0 μm,and the hardness was the optimum,up to 450 HV. Otherwise,with the increase of the frequency,the thickness of coating decreased from 14. 0 μm to 3. 0 μm,but the corrosion resistance increased. Under 500 Hz,the corrosion resistance of the oxidation coating was the best.