镁合金微弧氧化锆盐溶液体系的工艺及耐蚀性研究

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1、摘要本文通过大量试验成功配制锆盐溶液体系，考察微弧氧化工艺参数对锆盐溶液体系陶瓷层厚度及表面粗糙度的影响；通过比较锆盐与硅酸盐溶液体系陶瓷层的致密性，表明锆盐溶液体系陶瓷层具有较好的致密性，并测定锆盐溶液体系陶瓷层硬度达到1000HV以上。文中采用浸泡试验和中性氯化钠盐雾腐蚀试验两种方法考察镁合金微弧氧化陶瓷层的耐蚀性，结果表明锆盐溶液体系陶瓷层的耐蚀性是硅酸盐陶瓷层耐蚀性的近3倍，达到496h无点蚀；同时选定镁合金在锆盐溶液体系中微弧氧化处理的最佳工艺参数组合为：电流密度，2．0A·dm～；频率，600Hz；占空比，15％。最后，通过能谱和XRD衍射分析锆盐溶液陶瓷层所含元

2、素及其相成分，表明锆盐溶液陶瓷层中含有较大质量分数的锆元素和较大比例的二氧化锆相；对比496h盐雾腐蚀前后试样的表面微观形貌，可以看出，锆盐溶液陶瓷层越厚其腐蚀程度相对越轻。并通过观察陶瓷层截面微观形貌发现：锆盐溶液陶瓷层组织均匀，致密性较好。关键词：微弧氧化镁合金溶液体系耐蚀性AbstractInthispaper,alargenumberofexperimentshavebeencarriedforthesuccessfulpreparationofzirconiumsaltsolutionsystemtoinspecttheinfluencetoceramicsleve

3、lthicknessandsurfacerough／lessofmicro·arcoxidationtechnologicalparameterforzirconiumsaltsolutionsystem；Bycomparingthedensityofceramicsbetweenthezirconiumsaltsolutionsystemandthesilicicacidsaltsolutionsystem，thePaperindicatethatthezirconiumsaltsolutionsystemceramicshavethebettercompactness，a

4、nddeterminetheceramicsleveldegreeofhardnesstoachieveaboveI000HVinthezirconiumsaltsolutionsystem．Inthispaper,neutralsodiumchlorideimmersiontestandsaltspraycorrosiontestareusedtostudythecorrosionresistanceofceramiccoatingformagnesiumalloymicro．arCoxidation，andtheresultsshowthatthecorrosionres

5、istanceofceramiclayerinthezirconiumsaltsolutionsystemisnearly3timestothatinasilicatesaltsolutionsystem，achievednopitting496h；Atthesametime，thebestcombinationofprocessparametersareselectedbythemicro—arcoxidationprocessofmagnesiumalloyinzirconiumsaltsolutionasfollows：currentdensity,2．0A／dm2；f

6、requency,600Hz；dutycycle，15％．Finally,withenergyspectraandXRDdiffractionanalysisofceramiclayerofzirconiumsaltsolutionanditscomponentelementscontainedinthatlayer，theresultsshowthatalargermassfractionofelementsandalargeproportionofzirconiumzirconiaphasewereinexistence；Contrastingwiththesurface

7、of496hsalt·fogcorrosionsamples，wecanseethattheceramiclayerofzirconiumsaltsolutionerodemorelightwiththatrelativelythicker,andbyobservingthecross-sectionmorphologyofceramiclayer,wecanfindthat：layerceramicofzirconiumsaltsolutionhasbetterhomogeneityanddensit