現(xiàn)代材料學(xué)4-高分子在防腐蝕中的應(yīng)用

油管漏油--因穿孔或裂縫，引起著火爆炸7/17/20241現(xiàn)代材料學(xué)--高分子材料一去不復(fù)返的資源浪費(fèi):我國(guó)每年因腐蝕造成的損失達(dá)3000億元以上7/17/20242現(xiàn)代材料學(xué)--高分子材料金屬的腐蝕高分子材料防護(hù)方法高分子材料對(duì)金屬腐蝕的保護(hù)7/17/20243現(xiàn)代材料學(xué)--高分子材料金屬腐蝕的分類：（1）化學(xué)腐蝕金屬表面與介質(zhì)如氣體或非電解質(zhì)溶液等因發(fā)生化學(xué)作用而引起的腐蝕，稱作化學(xué)腐蝕?；瘜W(xué)腐蝕作用進(jìn)行時(shí)沒(méi)有電流產(chǎn)生。如將鐵塊放入稀硫酸中，

Zn+H2SO4=ZnSO4+H2。ZnHCl7/17/20244現(xiàn)代材料學(xué)--高分子材料（2）電化學(xué)腐蝕金屬表面在介質(zhì)如潮濕空氣、電解質(zhì)溶液等中，因形成微電池而發(fā)生電化學(xué)作用而引起的腐蝕稱作電化學(xué)腐蝕。ZnPtHClelectrons7/17/20245現(xiàn)代材料學(xué)--高分子材料析氫腐蝕與吸氧腐蝕如右圖所示，空氣中的CO2，SO2等可溶解在水中形成電解質(zhì)溶液，從而形成了原電池。其中鐵是陽(yáng)極，發(fā)生氧化反應(yīng)；銅是陰極，發(fā)生還原反應(yīng)。負(fù)極：FeFe2++2e（Fe被腐蝕）正極：（析氫腐蝕）2H＋＋2eH2（吸氧腐蝕）1/2O2＋2H＋＋2e-H2OCuFeH2O7/17/20246現(xiàn)代材料學(xué)--高分子材料金屬的防腐（1）在金屬表面涂敷各種保護(hù)層

(a)非金屬保護(hù)層在金屬表面涂上油漆、搪瓷、塑料、瀝青、高分子材料等，使金屬與腐蝕介質(zhì)隔開(kāi)。

(b)金屬保護(hù)層在金屬表面用電鍍或化學(xué)鍍的方法鍍上Au，Ag，Ni，Cr，Zn，Sn等金屬，保護(hù)內(nèi)層不被腐蝕。保護(hù)層可分為陽(yáng)極保護(hù)層和陰極保護(hù)層。7/17/20247現(xiàn)代材料學(xué)--高分子材料（2）加緩蝕劑在原電池的體系中加緩蝕劑， 改變介質(zhì)的性質(zhì)，降低腐蝕速度。(a)鈍化促進(jìn)型：鉻酸鹽，亞硝酸鹽等；(b)形成沉淀膜：聚磷酸鹽，聚硅酸鹽等；(c)形成吸附膜：有機(jī)物分子，含有能吸附于金屬表面，電負(fù)性大的N,O,P,S的陰性基，和阻礙腐蝕 性介質(zhì)與金屬表面接觸的非極性基(烷基)。7/17/20248現(xiàn)代材料學(xué)--高分子材料（3）電化學(xué)保護(hù)

1．保護(hù)器保護(hù)將電極電勢(shì)較低的金屬和被保護(hù)的金屬連接在一起，構(gòu)成原電池。電極電勢(shì)較低的金屬作為陽(yáng)極而溶解，被保護(hù)的金屬作為陰極而避免腐蝕。又稱犧牲陽(yáng)極保護(hù)法。

2．陰極電保護(hù)利用外加直流電，將負(fù)極接到被保護(hù)金屬上，作為陰極。正極接到一些廢金屬作陽(yáng)極，使其受到腐蝕而保護(hù)了陰極。3．陽(yáng)極電保護(hù)利用外加直流電，將被保護(hù)金屬接到正極上，電極電勢(shì)向正的方向移動(dòng)，使金屬“鈍化”而得到保護(hù)。7/17/20249現(xiàn)代材料學(xué)--高分子材料高分子材料防護(hù)工藝

7/17/202410現(xiàn)代材料學(xué)--高分子材料涂裝方法和裝備空氣噴涂高壓無(wú)氣噴涂靜電涂裝粉末涂裝電泳涂裝自泳涂裝簾幕涂和輥涂7/17/202411現(xiàn)代材料學(xué)--高分子材料硝基漆醇酸樹(shù)脂漆氨基樹(shù)脂漆環(huán)氧樹(shù)脂漆聚酯樹(shù)脂漆丙烯酸樹(shù)脂漆聚氨酯漆氟樹(shù)脂漆有機(jī)硅樹(shù)脂漆乙烯基樹(shù)脂漆涂料的品種7/17/202412現(xiàn)代材料學(xué)--高分子材料StructureofSomeCommonPolymers7/17/202413現(xiàn)代材料學(xué)--高分子材料7/17/202414現(xiàn)代材料學(xué)--高分子材料7/17/202415現(xiàn)代材料學(xué)--高分子材料7/17/202416現(xiàn)代材料學(xué)--高分子材料CoatingprocessesPurpose: protection

oxidation

rotting

u.v.degradation appearance

color

gloss

adhesion

stickers transfersimpermeability

water oxygen7/17/202417現(xiàn)代材料學(xué)--高分子材料Somecoatingprocessesfilmcoatingverylowviscosityrollcoatingsimplekisscoatingaccurate,thinknifecoatingrobustcurtaincoatingfast,thinHighviscositiesLowviscosities7/17/202418現(xiàn)代材料學(xué)--高分子材料RollcoatingModelling:likecalandering,butwithseparationinthemiddelHH07/17/202419現(xiàn)代材料學(xué)--高分子材料H(x)xyproblemnoproblemnonelasticliquidselasticliquidsCurtainCoating

(theroleofvisco-elasticity)with7/17/202420現(xiàn)代材料學(xué)--高分子材料PowderCoating7/17/202421現(xiàn)代材料學(xué)--高分子材料混氣靜電噴涂原理混氣噴涂原理7/17/202422現(xiàn)代材料學(xué)--高分子材料7/17/202423現(xiàn)代材料學(xué)--高分子材料IntroducestensiontolineCleanscoppersurfaceImprovedcoppersurface;improvedelectricaltransmissionFluoro-thermo-plastic

WireExtrusioncoating7/17/202424現(xiàn)代材料學(xué)--高分子材料CopperPreheatingIndicatorsHighpreheatVoidedinnersurfaceSmoothoutersurfaceBetteradhesion>stripLowpreheatRoughoutersurfacePooreradhesionRecommendationsTemperatureguidelinesFEP/PFA100-180CETFE/THV50CDependsonlinespeedMeasurementPapergoodcomparativetestuniversal7/17/202425現(xiàn)代材料學(xué)--高分子材料Extruderspec’sL/D24-34:1Saxtonmixing2-4xdiameterCloseheatcontrolnecessaryforastableprocesscorrosionprotectedmaterialnickelalloyExtruderneedstohaveatleast400Cmaximumtemperature7/17/202426現(xiàn)代材料學(xué)--高分子材料SpecsFixedoradjustablecenterCorrosionprotectedmaterialconstructionCoex/singleextrusionpossible7/17/202427現(xiàn)代材料學(xué)--高分子材料MeltfractureSmoothsurface?Sharkskin‘ExtrudedfilmTubing7/17/202428現(xiàn)代材料學(xué)--高分子材料ToolingcalculationsDDR=(DD2-DT2)/(dCC2-dW2)DRB=(DD/dCC)/(DT/dW)7/17/202429現(xiàn)代材料學(xué)--高分子材料ConeIndicatorsToolongDiametervariationUnstableTooshortsurfaceroughnesssparks/pinholesconebreaksUnstableTipanddienotconcentricCorenotcenteredMelttoohotorcoldLinespeedtoohighRecommendations30-40mm7/17/202430現(xiàn)代材料學(xué)--高分子材料CapstanColdwaterspraytypicalGroovedsheavespreferableoverstationaryguides7/17/202431現(xiàn)代材料學(xué)--高分子材料Gauges/IndicationsLinetensiongaugeofinstabilityIdentifyconductordamageInner(copper)diametercoppersizeandqualityCapacitancecrucialforfoamadhesionproblemseccentricityproblemsdiameterproblems7/17/202432現(xiàn)代材料學(xué)--高分子材料Gauges/IndicationsOuterdiameterProductsizeLong-termvariationovalityEccentricityCoppercenterLump/neckdownShorttermvariationSparktesterholes,thinspots7/17/202433現(xiàn)代材料學(xué)--高分子材料TFT’sDesignandManufacturingObjectivesforLDHHardwareReducethepotentialforcorrosionwithinintakeandgatevalvesProvidemaximumflowwithminimalfrictionlossinallproductsDesignamanufacturingandassemblysystemthatwillallowrapiddeliveryofover500finishedgoods7/17/202434現(xiàn)代材料學(xué)--高分子材料NEWPolymerRingReplacesBallBearingsinourHardwareCouplingsProvidesabreakinelectricalconductivityfromPumptoHardware,reducinggalvaniccorrosionAllowscouplingtobesimplychangedOfferstwicetheshearstrengthofcompetitivedesigns7/17/202435現(xiàn)代材料學(xué)--高分子材料Competitivemodelsuseeithermetalballbearingsoracetylplasticdiscsastheirconnectionandrotationmethod.7/17/202436現(xiàn)代材料學(xué)--高分子材料WhyTFTChoseaPolymerRinginourcouplings?OurPolymerRingProvidesaHighBearingSurfaceAreaHighpotentialforshearandcouplingfailureCompetitivedesignTFTExclusive7/17/202437現(xiàn)代材料學(xué)--高分子材料GalvanicCorrosion

Bronzeincontactwithaluminum(metaltometalcontact)inawetatmosphereMetaldegradationduetogalvaniccorrosion7/17/202438現(xiàn)代材料學(xué)--高分子材料Corrosionduetogalvanicactionandmineralladenwaterisabigcontributortoprematurehardwarefailure.7/17/202439現(xiàn)代材料學(xué)--高分子材料CorrosionResistance–TFT’suniqueThree-StepprocessPoly-ImpregnationofrawcastingsundervacuumtosealporosityHardcoatAnodized

PolyesterPowderCoatedinsideandoutMaximumCorrosionResistance

PowderCoatPolyImpregnationHardCoatAnodized7/17/202440現(xiàn)代材料學(xué)--高分子材料RawAluminumAlloyCasting123Underavacuum,thecastinghaspolymersinjectedtocloseallporeswheremoisturecanbetrappedHardcoatanodizingcreatesanaluminumoxidebarrierforincrediblehardnessandcorrosionresistancePowdercoatisappliedandbakedonforapermanentlybondedcorrosionresistantfinish7/17/202441現(xiàn)代材料學(xué)--高分子材料RawCastingisfirstPoly-ImpregnatedThen…HardCoatAnodizedFinally…PowdercoatedRawCastingPolyImpregnatedHardCoatAnodizedPowderCoated7/17/202442現(xiàn)代材料學(xué)--高分子材料ChangingtheConceptoftheApparatusIntakeValveRedesigned,high-flow,quickactingreliefvalveExclusivevisualvalvepositionindicator7/17/202443現(xiàn)代材料學(xué)--高分子材料HeavydutybronzevalvegearingCorrosionresistantpatentedquarterballassemblyPolymerRingSwivelingInlet7/17/202444現(xiàn)代材料學(xué)--高分子材料WherethereisWater,therecanbesomelevelofCorrosionPistonStyleValveStaysWetBIVStyleValveRemainsDrywhennotflowingWaterfrompump7/17/202445現(xiàn)代材料學(xué)--高分子材料TheNEWBIV–HighestReturnonYourInvestmentAkronBlackMaxwithSwiveling5”StorzInletAWG-HarringtonwithSwiveling5”StorzInletTFT’sBIVwithSwiveling5”StorzInletSnap-TitewithSwiveling5”StorzInlet7/17/202446現(xiàn)代材料學(xué)--高分子材料BIVKeySelling

FeaturesMostInnovativeIntakeValveEverDesignedAndProducedSwivelingInletHighFlowReliefValveCorrosionResistantUniqueBallShutOff7/17/202447現(xiàn)代材料學(xué)--高分子材料BIVKeySelling

BenefitsTriple–CoatingProcessandnewpolymerringdesignwilllimitcorrosionthatplaguescompetitivemodelsBallStyleShutoffandstraightthroughwaterwaydesignwillprovidehigherflowswithlimitedfrictionloss–maximizingpumpefficiencySwiveling30-DegreeInletallowseitherLDHhoseorhardsuctiontosupplythepumpfromdifferentanglespreventingkinksandflowrestrictions7/17/202448現(xiàn)代材料學(xué)--高分子材料ChangingtheConceptoftheJumboGateValveOptionalSwivelinginlet7/17/202449現(xiàn)代材料學(xué)--高分子材料ThenewJumboGateValveSeries250psioperatingpressureMeets900psihydrostatictestforNFPA#1965Foreitherpressureorsuctionservice106modelsavailablewiththreadedorStorzcouplingsto6”Uniquebi-directionalvalveseatNon-risinghandwheelOptionalSwivelingInletUniqueStainlessSteelWedgeGateDesignTripleProcessCorrosionProtectionHighFlowPerformance7/17/202450現(xiàn)代材料學(xué)--高分子材料ThePoweroftheWEDGEdesign.LowGasketWearPositiveSealingStainlessSteelWedge7/17/202451現(xiàn)代材料學(xué)--高分子材料TopreventcorrosioninthenewJumboGateValve,TFThaschosenaheavystainlesssteelgate(unlikeothercompetitors)TFT’sExclusiveGate7/17/202452現(xiàn)代材料學(xué)--高分子材料JUMBOGateValveSeriesKeySelling

FeaturesMostDurableGateValveEverDesignedAndProducedSwivelingInletHighFlowWedgeSeatDesignCorrosionResistantStainlessGate7/17/202453現(xiàn)代材料學(xué)--高分子材料JUMBOGateValveSeriesKeySelling

BenefitsTriple-CoatingProcessandnewpolymerringdesignwilllimitcorrosionStainlessWedgeGateandstraightthroughwaterwaydesignwillprovidehigherflowswithlimitedfrictionloss–eitheronthetruck,oroffSwiveling30-DegreeInletoptionallowseitherLDHhoseorhardsuctiontosupplythepumpfromdifferentanglespreventingkinksandflowrestrictions7/17/202454現(xiàn)代材料學(xué)--高分子材料MaximumWaterDistributionwiththeJUMBOWYESeries7/17/202455現(xiàn)代材料學(xué)--高分子材料ThenewJumboWyeSeries250psioperatingpressureMeets900psihydrostatictestforNFPA#1965StainlessSteelComponents176modelsavai