NaOH浓度对ZAlSi12Cu2Mg1微弧氧化陶瓷膜形成及其特性的影响  

Effects of Concentration of NaOH on the Formation and Characteristics of Ceramic Coatings Formed on ZAlSi12Cu2Mg1 Alloy by Microarc Oxidation

作　　者：刘永珍[1] 刘向东[1] 王晓军[1] 韩春霞[1] 刘彩文[1] 

机构地区：[1]内蒙古工业大学,内蒙古呼和浩特010051

出　　处：《稀有金属材料与工程》2007年第A03期599-603,共5页Rare Metal Materials and Engineering

基　　金：铝合金陶瓷气缸的开发与产业化内蒙古科技攻关项目(20040202)

摘　　要：在NaOH-Na_2SiO_3电解液体系下对ZA1Si12Cu2Mg1合金进行微弧氧化.通过改变NaOH的浓度研究其对微弧氧化的临界起弧电压、微弧氧化过程中试样表面火花形态、陶瓷膜的生长速率及陶瓷膜厚度的影响。结果表明:随NaOH浓度从0.5 g/L到3.0 g/L逐渐增加,微弧氧化的临界起弧电压从420 V逐渐降低到350 V,陶瓷膜的厚度从138μm逐渐增加到242μm,陶瓷膜的平均生长速率从2.30μm/min提高到4.03μm/min:当NaOH浓度超过2.0 g/L后,陶瓷膜表面变粗糙,甚至烧蚀;NaOH的最佳浓度为2.0 g/L。The composition of electrolyte has important effect on the formation and characteristics of ceramic coating formed by microarc oxidation. It is significant to select correct electrolyte for obtaining ceramic coatings with excellent properties. In this work, ceramic coatings were prepared by microarc oxidation process on ZAlSi12Cu2Mg1 alloy in NaOH-Na2SiO3 electrolytes. The influences of concentration of NaOH on the arcing voltages, characteristics of spark spot of the sample coating formation and the thicknesses of ceramic coatings were investigated, respectively. It is 420 V to 350 V, the thickness of ceramic coating increases gradually from 138 μm to 242μm in fou the microarc oxidation, the rate of ceramic nd that the arcing voltage descends from rate of ceramic coating formation grows from 2.30μm/min to 4.03μm/min while concentration of NaOH rises from 0.5g/L to 3.0g/L. But the surface of ceramic coating becomes coarse or ablative as concentration of NaOH exceeds 2.0 g/L. The suitable concentration of NaOH is 2.0 g/L

关 键 词：NaOH浓度 微弧氧化 起弧电压 ZALSI12CU2MG1 

分 类 号：TG174.451[金属学及工艺—金属表面处理]