喷砂镁合金微弧氧化电解液组分的优化

Optimization of Electrolyte Concentration in Micro-arc Oxidation on Sand-blasting Magnesium Alloy

采用正交试验优化了喷砂后镁合金微弧氧化电解液组分,讨论了组分浓度对氧化膜性能的影响,并用SEM、EDS、XRD等分析了优化工艺后氧化膜的微观形貌、化学成分和相组成。研究表明,较优的电解液组分为15g/L的Na2SiO3·7H2O、6g/L的KF·H2O、9g/L的KOH、10mL/L的C3H2(OH)3;氧化膜表面形貌保留了喷砂时的粗糙不平;氧化膜由大量均匀的、微孔内径为0.2～1.5μm的陶瓷层组成,物相则主要由Mg、MgO、Mg2SiO4、MgAl2O4及无定型相组成。

Electrolyte concentration in micro-arc oxidation on sand-blasting magnesium alloy was optimized by orthogonal testing.Effects of component concentration on properties of micro-arc oxide film were approached,and the morphology,chemical composition and phase structure were analyzed by SEM(scanning electron microscope),EDS(energy dispersive spectrometer),XRD(X-ray diffraction).The results show that optimal electrolyte concentration is as follows:15g/L Na2SiO3·7H2O,6g/L KF·H2O,9 g/LKOH,10mL/L C3H2(OH)3.Surface morphology of film inherits the sand-blasting's ones.Oxide film consists of ceramic layer with a great deal of uniform discharge hole with diameters in range of 0.2～1.5 μm,and the phase is composed of Mg,MgO,Mg2SiO4,MgAl2O4and some arbitrary phase.