丙三醇在铝合金微弧氧化膜形成中作用的研究

在Na2SiO3-NaOH复合电解液体系下,对ZAlSi12Cu2Mg1微弧氧化陶瓷膜的形成进行了研究;通过改变丙三醇的含量,研究了其对电解液的电导率、微弧氧化的临界起弧电压、稳定氧化时间和陶瓷膜层厚度的影响,分析了丙三醇的作用。结果表明,丙三醇含量从0 ml/L到12 ml/L变化时,临界起弧正向电压由360 V逐渐升高至410 V,稳定氧化时间由16 min延长到26 min;含量从0 ml/L增加到4 ml/L时,膜厚从65μm迅速增加到152μm。含量超过4 ml/L,膜厚缓慢增加。电解液中加入丙三醇,膜层中除了莫来石相,还出现了α-Al2O3、γ-Al2O3、WO3和SiO2相。

Study on Function of Glycerin in Forming Ceramic Coating on Aluminum Alloy by MAO

The forming of ceramic coatings on the surface of ZAlSi2Cu2Mg1 by MAO in a Na2SiO3-NaOH compound electrolyte were investigated.The influences of Glycerin content on the conductivity of electrolytes,arc starting voltage,stable oxidation time and thicknesses of ceramic coatings were analyzed,respectively.The results show that,when the content of Glycerin rises from 0 to 12 ml/L,arc starting voltage increases from 360 V to 410 V,stable oxidation time increases from 16 min to 26 min;When the content of Glycerin rises from 0 to 4 ml/L,the thickness of ceramic coatings rises gradually from 63 μm to 152 μm and rises slowly subsequently.The ceramic coatings formed from the electrolyte with Glycerin are composed of mullite,α-Al2O3,γ-Al2O3,WO3 and SiO2.