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1、AZ91D镁合金在SO?薄液膜下的腐蚀行为研究*林翠肖志阳匕2,梁健能彳(1.南昌航空大学“轻合金加工科学与技术”国防重点学科实验室，南昌330063；2.南昌航空犬学材料学院，南昌330063；3.中国电器科学研究院,广东广州510300)摘要:利用自建厚度控制和大气腐蚀薄液膜电化学测试装賈，运用极化曲线以及交流阻抗谱,探讨AZ91D镁合金在含SO?薄液膜下的腐蚀电化学行为，并采用金相显微镜和扫描电镜观察薄液膜下的腐蚀形貌。结果表明：薄液膜厚度和SO?对镁合金阴阳极化率都有影响。SO2的加入使阴阳极化率降低，加速镁合金在薄液膜下的腐蚀。随着薄液膜的减薄，腐蚀加速，5
2、0pn下出现最大值；但在极薄液膜下腐蚀产物的形成阻碍02的扩散，腐蚀减缓。极限扩散电流密度随薄液膜厚度的增大先增加后减小，薄液膜悍度小于50pm,腐蚀产物的堆积使阳极过程受到抑制。镁合金在SO2薄液膜下的阻抗图由个高频容抗弧和一个低频扩散阻抗组成，表现为两个吋间常数。随着腐蚀的进行，陷不断增加，腐蚀速率降低。在不同厚度SO?薄液膜卜腐蚀倾向的顺序为:50
3、xm>20
4、im>200
5、im>300
6、xmo关键词：AZ91D镁合金；薄液膜；SO2；电化学行为；腐蚀中图分类号：TG172.3文献标识码：A文章编号：CorrosionofAZ91DMagnesiumAlloyU
7、nderThinElectrolyteLayerContainingSO2LINCuiu,XIAOZhi-yangL2,LIANGJian-neng3(1.NationalDefenceKeyDisciplineLaboratoryofLightAlloyProcessingScienceandTechnology,NanchangHangkongUniversity,Nanchang33(X)63;2.SchoolofMaterialScienceandTechnology,NanchangHangkongUniversity,Nanchang330063;3.Ch
8、inaNationalElectricApparatusResearchInstitute,Guangzhou510300)Abstract:Theself-builtthinelectrolytelayerthicknesscontrollingandelectrochemicalmeasurementsystemwasutilizedtoinvestigatethecorrosionelectrochemicalbehaviorofAZ91DmagnesiumalloyunderthinelectrolytelayercontainingSO2bymeansofp
9、olarizationcurveandelectrochemicalimpedancespectium,furthermorethemorphologieswereinvestigatedbyopticalmicroscopeandscanningelectronmicroscopy.ThethicknessofthinelectrolytelayerandSO2hadsomeeffectsonanodic,cathodicpolarizationslope・SO2enabledanodic,cathodicpolarizationslopetodrop,indica
10、tingtheaccelerationofcorrosionofmagnesiumalloy.Withthedecreaseofthethicknessofthinelectrolytelayer,thecorrosionrateincrease.Themaximumvaluewasfoundat50
11、imthicknessofthinelectrolytelayercontainingSO2.Theformationofcorrosionproductsunderelectrolytelayerwithverythinthicknessblockedtheoxyge
12、ndiffusion,leadingtotheslowingdownofcorrosion.Thelimiteddiffusioncurrentdensityfirstlyincreasedandthendecreasedwiththeincreaseinthethicknessofthinelectrolytelayer.Whenthethicknessof收稿日期:2012-05-21；修订日期:2013-03-28基金资助：国家自然科学基金资助项H(50601012)；江西省自然科学基金资助项H(2009GQC0110)作者简介：林翠(1976
