纳米晶镁合金表面化学镀ni-p合金镀层的分析

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1、太原理工大学硕士研究生学位论文resistanceofNi—Pcoating．Thethesisfocusedontheoptimumprocesstoobtainthefavourablecoatingofmorphology,uniformthickness，wearandcorrosionresistanceproperties．Tilematrixgrainweretessellatedanddefectswerereduced，SOthatthequalitywasenhancedandcorrosionresistaneeofNi—Pc

2、oatingonmagnesiumalloycouldbeimprovedthroughnano—processonthesurfaceofmagnesiumalloy．Inaddition，thepaperstudiedtheinfluenceofthermaltreatmentontheNi—PcoatingofNanocrystallinemagnesiumalloy．Basedonthestudies，themainconclusioncanbedrownasfollows：1、Theoptimaltechnologicalschemeof

3、electrolessplatingwhichwascheapandsimplewasconfirmedfrommultipleexperiments．NiS04’6H20NaH2P02’H20CH3COONaNH4HFHF(40％)thiocarbamidePH16g／L；14g／L；13g／L；8g／L；12ml／L；0．001g／L；6．4±O．2：Temperature：80±2℃。2、Thr。ughthisl(i11d。ftecllll。1。giJIllscheme,thetypicalcellularstructurecouldbeob

4、tainedwithcompactanduniformcoatingbutnoobviousdefect(averagein20—30Ⅲm)Ni—Pplatingwasphosphoruscoatingwithphosphorus。V】太原理工大学硕士研究生学位论文contentwasbetween5％and8％．3、Comparedtothecoarse—grainedmagnesiumalloy,theplatingrateonnanocrystallinewasslowerinmagnesiumalloysurfaceelectrolessp

5、latingwhichwastreatedbymeansofnano．Thereasonwasthatnanocrystallinemagnesiumalloyownthebiggerspecificsurfaceareaandencounteredmoreresistanceinstageofsurfacenucleation．Whereasinthenucleationstage，theactivationpointandplatingrateofnanocrystallinemagnesiumalloygotmore，coatingthick

6、nesswasalsogreat．4、ThehardnessoftheNi—Pcoatingonthesurfaceofmagnesiumalloywasreachedto427HVwhereasthecoatingonthenanocrystallinecouldbeattainedto689HVBymeansofthermaltreatment．thehardnessofthecoatingwaspromotedfurtheron．Especiallywhenthetemperaturewas300。C，itcouldbereachedto13

7、0HV．Thewear—resistingperformanceofthecoatingcouldbepromotedthroughthehardness．Moreover，thefrictioncoefficientisdecreaseslightly．5、Thecorrosionresistanceofmagnesiumalloycouldbereducedbynanocrystalline，butitonNi—Pcoatingwasincreased．Thecorrosionresistanceofcoatingdepressedaftert

8、hermaltreatment．Meanwhile，itgotworseandworseinthewakeoftemper