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1、Y.Yang,S.TereshkoandS.DanylukTheGeorgeW.WoodruffSchoolofMechanicalEngineeringGeorgiaInstituteofTechnologyElectrochemicalSensorsforIndustrialLubricantAnalysisInternationalSymposiumonFrontiersofElectrochemicalScienceandTechnology,August12-15,2009,Xi'an,ChinaAgendaIntroductionO
2、ilanalysisbasicsElectrochemicalviewvs.tribologicalviewElectrochemicalSensorsParallelPlateElectrode(PPE)DIvs.saltwaterwithEISVirginoilvs.usedoilwithEISSummaryWhyOilLubricants?Industriallubricants,beingalifebloodofanengine,isvitaltoengine.ThefunctionsoflubricantsincludeSeparat
3、ionofmovingpartsandfrictionreduction,Wearprevention,Contaminantsuspension,Neutralizationofcorrosiveacidsfromthecombustionprocess,DissipationofheatProvidingotherperformanceimprovingfeatures.Lubricantsconsistofamineralorsyntheticbaseoilandotherspecificallydesignedadditives.Oil
4、deteriorationratedependsontheoperatingconditions,thefuelquality,theambientconditions,andoperatingparameters.SchemesofOil-MetalInterfaceTribologicalviewPhysisorptionChemisorptionChemicalreaction(wearandre-oxidation)ElectrochemicalviewElectricaldoublelayerCharge-transferresist
5、anceChemicalreaction(electricalconduction)MetalOilMetal-+-+-+-++-----------------+++++----------------+-+-+-+-+++++++++++++BaseStocksandOilAdditivesBaseStocksMineralParaffinsNaphthenesAromaticsAsphaltenesSyntheticPolyalphaolefins(45%)Organicester(25%)Polyglycols(10%)Widecarb
6、onnumberdistributionC18-C40.AdditivesSurfactants–formingprotectivefilm,neutralizingtheacidicproductsofcombustionandthermo-oxidation;interactingwithwater,glycolandotherpolarcontaminantsDispersants–suspendingsootsOxidationinhibitors–reducingtheoxidationrateofalubricantAnti-wea
7、ragents–providingprotectionagainstwearbyformingprotectivefilmsonmetalsurfacesElectrochemicalOilSensorsOilCharacteristicsComplexcombinationofhydrocarbonsNon-aqueouscolloidalpolymersLow,primarilyionicelectricalconductivityMolecularweight500to50,000Polarfunctionheadandnon-polar
8、tailsDiffusioncoefficient10-8to10-12cm2/sSymmetricElectrolyteФE-vDAQCompute
