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乳酸-丙酸体系化学镀低磷镍-磷合金镀层的研究 Title:AStudyonElectrodepositionofLow-phosphorusNickel-phosphorousAlloyCoatingusingLacticAcid-PropionicAcidSystem Introduction: Electrodepositionisawidelyusedmethodforapplyingprotectiveandfunctionalcoatingsonvarioussubstrates.Thepropertiesofthecoatingscanbetailoredbyadjustingtheoperatingparametersandthecompositionoftheplatingbath.Inthisstudy,weinvestigatetheelectrodepositionofalow-phosphorusnickel-phosphorousalloycoatingusingalacticacid-propionicacidsystem. Objective: Theaimofthisresearchistoexploretheelectrodepositionprocessandpropertiesoflow-phosphorusnickel-phosphorousalloycoatingsandunderstandtheinfluenceofthelacticacid-propionicacidsystemonthecoatingcharacteristics. ExperimentalProcedure: 1.Preparationofplatingbath:Asolutioncontainingnickelsulfateandsodiumhypophosphiteisprepared.Distilledwaterisaddedtomaintainadesiredvolume.Lacticacidandpropionicacidareaddedinvaryingproportions. 2.Electrodeposition:Thesubstrate,usuallyametallicsample,isusedasthecathode,andanickelelectrodeisusedastheanode.Thedepositioniscarriedoutundercontrolledtemperatureandcurrentdensityconditions. 3.Characterization:Thedepositedcoatingsarecharacterizedusingtechniqueslikescanningelectronmicroscopy(SEM),energy-dispersiveX-rayspectroscopy(EDS),X-raydiffraction(XRD),andmicrohardnesstesting. ResultsandDiscussion: Thecompositionandstructureofthedepositedcoatingsarestronglyinfluencedbythelacticacid-propionicacidsystem.Theadditionoflacticacidpromotestheformationofauniformandcompactcoating,whilepropionicacidaffectsthedepositionrateandphosphoruscontent.Thedepositionrateincreaseswithanincreaseinpropionicacidconcentrationduetoenhancedmasstransfer.However,excessivepropionicacidleadstodecreasedphosphoruscontent,potentiallyaffectingthecorrosionresistanceofthecoatings.SEMandEDSanalysisrevealthemorphologicalandelementalcompositionvariationsinthecoatingswithdifferentlacticacid-propionicacidratios.XRDanalysisshowsthatthecoatingsexhibitatypicalnickel-phosphorousalloystructure. Conclusion: T