飞机架构用7075合金的微弧氧化工艺

Microarc oxidation process of 7075 alloy for aircraft structure

以飞机架构用7075合金为研究对象,通过正交试验法优化了7075合金在NaAlO_2、Na_2SiO_3、Na_2B_4O_7和Na_3PO_4四个电解液体系下的微弧氧化工艺参数最佳方案,并对微弧氧化膜层的厚度、硬度、表面形貌和截面形貌进行了表征。结果表明,7075合金微弧氧化的四种电解液的最佳配方为:NaAlO_2浓度为9g/L、Na_2SiO_3浓度为8 g/L、Na_2B_4O_7浓度为15 g/L、Na_3PO_4浓度为12 g/L,NaOH和三乙醇胺浓度分别为1 g/L和3 g/L;四种优化电解体系的微弧氧化陶瓷膜层的显微硬度的最大值出现在NaAlO_2体系(1091 HV0.1)而陶瓷膜层的最小值出现在Na_3PO_4体系(553 HV0.1)。

Orthogonal experiment was carried out on 7075 alloy to optimize the microarc oxidation process in NaAl_02,Na_2SiO_3,Na_2B4O_7 and Na_3 PO_4 electrolyte systems,respectively.The microarc oxidation film thickness,hardness,surface morphology and cross section morphologies were characterized.The results show that the optimum concentration of the four kinds of electrolyte systems for microarc oxidation of the 7075 alloy that are NaAlO_2（9 g/L）,Na_2SiO_3（8 g/L）,Na_2B_4O_7（15 g/L）,Na_3PO_4（12 g/L）,NaOH and triethanolamine（1 g/L and 3 g/L）,respectively.The maximum microhardness of the microarc oxidation ceramic coatings obtained in the optimized electrolysis system appears in the NaA1O_2 system（1091 HVO.1）,and the minimum value of the ceramic film in the Na_3PO_4 system（553 HVO.1）.