zk镁合金微弧氧化硅酸盐电解液的优化及膜层特性

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1、ZK60镁合金微弧氧化硅酸盐电解液的优化及膜层特性第2O卷第10期Vb1.2ONO.1O中国有色金属TheChineseJournalofNonferrousMetals2010年10月Oct.20lO文章编号:1004.0609(2010)10.1868—08ZK60镁合金微弧氧化硅酸盐电解液的优化及膜层特性芦笙,徐荣远,陈静,侯志丹,王泽鑫,汤莉(1.江苏科技大学材料科学与工程学院,镇江212003;2.江苏科技大学机械工程学院,镇江212003)摘要:在硅酸钠,氢氧化钠,四硼酸钠和柠檬酸钠组成的电解液中,采用交流脉冲电源对ZK

2、60镁合金进行微弧氧化,研究电解液组分对膜层的影响规律,并优化电解液配方.利用光学显微镜,扫描电镜(SEM),能谱分析fEDS)和X射线衍射分析(XRD)等,研究膜层厚度,表面与截面的微观组织,通过静态腐蚀质量损失法和动电位极化曲线法测试膜层在3.5%NaC1介质中的耐蚀性能.结果表明:各电解液组分浓度对成膜过程的电压变化,膜层厚度和耐蚀性能的影响规律各不相同,并在不同的合适浓度下获得厚的膜层和较高的耐蚀性能.通过单变量实验和正交实验优化电解液配方:60g/LNaSiO3+20g/LNaOH+25g/LNaB4O7+20g/LC6H

3、5Na307,制备出的膜厚高达164.89pan,结构均匀,致密,腐蚀速率极低,仅为ZK60镁合金空白试样的1.8%.关键词:ZK60镁合金;微弧氧化;NaESrO3电解液;配方;膜层中图分类号:TG174.453文献标志码:AOptimizationofsilicateelectrolyteformicro—arcoxidationandcharacteristicofcoatingfabricatedonZK60magnesiumalloyLUSheng,XURong—yuan,CHENJing2,HOUZhi.dan,WANG

4、Ze—xin,TANGLir1.SchoolofMaterialsScienceandEngineering,JiangsuUniversityofScienceandTechnology,Zhenjiang212003,China;2.SchoolofMechanicalEngineering,JiangsuUniversityofScienceandTechnology,Zhenjiang212003,China)Abstract:Themicro—arcoxidationprocesswasconductedonZK60Mga

5、lloyinanelectrolytecomposedofNaSiO3,Na0H,NaB4O7andC6H5Na3O7byACpulseelectricalSOUrCe.nlecoatingthicknessandmicrostructuralcharacteristicsofcoatingcross—sectionandsurfacewereinvestigatedbymearlsofOM.SEMcoupledwithEDSandXRD.111emasslossanddynamicpotentia1curvesweremeasUr

6、edina3.5%NaClsolutiontoevaluatethecoatingresistancetocorrosion.Theresultsrevealthatdifferentelementsoftheelectrolytedemonstratedifferenteffectsonprocessvoltage,coatingthicknessandcorrosionresistance.Foranelementoftheelectrolyte,thereisusuallyasuitableconcentrationtoobt

7、ainathickercoatingbutwhichdoesnotguaranteeabeRercorrosionresistance.Bymeansofsinglevariableando~hogonaltests,anoptimizedelectrolyrewithacompositionof60NaSiO3+20gmNaOH+25gmNaB407+20gmC6H5Na307wasdeveloped.Thesamplepreparedwiththeoptimizedelectrolyteexhibitsgoodcorrosion

8、propertywithonly1.8%ofcorrosionrateofblanksampleduetoitsthicker(164.89m)anddensercoating.Keywords:ZK60magnesiumalloy;