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1、保持頁(yè)眉空白，會(huì)議排版統(tǒng)一使用保持頁(yè)腳空白，會(huì)議排版統(tǒng)一使用TheStudyofEnvironmentallyFriendlyPrepaintedSteelfApplianceinBaosteelRENYuling1，LUHua1WENNaimeng2FANChun3(1ColdRollingPlantofBaosteelBranchShanghai200941，China2BaosteelResearchInstituteShangh

2、ai201900，China.ManufactureAdministerdepartmentofBaosteelBranchShanghai200941，China.)Abstract:TheprepaintedsteelofBaosteelhasbeenusedinappliance.IncaseofthedeadlineofROHSiscomingwestudiedtheinfluenceofpretreatmentcoatingp

3、roductiontechnologies.ThepropertiesofenvironmentallyfriendlyprepaintedsteelfapplianceinBaosteelisbettertheotherstheproductshavebeenusedintheappliancesuccessfully.Keywds:Environmentallyfriendlyprepaintedsteelappliancecoat

4、ingpretreatment1IntroductionTheprepaintedsteelwhichisusedinappliancebeganin1970’.Itreached2.14MTin2004inthewld(12.3%ofthecoatedsteel)（1）.Chinaisoneofthemanufacturebasefhouseholdappliance.Theproductsnotonlyhavebeenconsume

5、dinlbutalsoaretheOEMofthefamousbrinthewld.SothehouseholdappliancewhichproducedinmainlofChinahavebeensoldinthesupermarketofEurope.AftertheROHSannounced，theenvironmentallyfriendlyprojectsmeasureshavebeeninvestigatedbymanyi

6、ndustries.TheprepanitedsteelifitisusedintheappliancemustsatisfytheROHS.WiththedeadlineiscomingmemeappliancemanufacturerbringuptheenvironmentallyfriendlyrequirementsontheprepaintedsteelBaosteelresearcheddevelopedprepainte

7、dsteelfappliancein1996.(2)ButthequalityofproductsurfacedidnotsatisfythecustomerbecauseofthelimitationofequipmentsinCCL.Intheothersidestheconsumptionofprepaintedsteelinappliancewasverylowbecausetherewerenotsuitablemouldcu

8、ttingline.Recentlymemefactybegantouseprepaintedsteelinappliance.NewlineshavebeenputintoproductioninBaosteelalsoareabletoproducetheproductwhichhasthegoodsurfacequalitythecoatingproperty.NowtheprepaintedsteelofBaosteelhasb

9、eenusedinrefrigeratmicrowaveovenDVDwashingmachineairconditionersoon.IndertomeettherequirementofROHSBaosteeldevelopmenttheenvironmentallyfriendlyprepaintedsteel.Thestructureoftheprepaintedsteelisasfig1itincludethesubstrat

10、e(coldsteelplating)pretreatmentfilmprimerfinishbackingcoat.Theharmelementsarecontainedinthatfilm.IndertoobtainthespangleaddingthePbinthebathofmeltingzincinCGLindertoimprovetheabilityofanticrosionoftheproductitusethepostt

11、reatmentcontainthehexavalentchromium.thesubstratelikethatcannotbeusedintheenvironmentallyfriendlyprepaintedsteel.ItismeansthesubstateofprepaintedsteelfROHSmustusedtheHDGwhichhavenoleadhexavalentchromium.Itisstilltruethat

12、themostwidelyusedpretreatmentsinCCLarebasedoncompounds.Theseareappliedeitheraschromate保持頁(yè)眉空白，會(huì)議排版統(tǒng)一使用保持頁(yè)腳空白，會(huì)議排版統(tǒng)一使用Theitemsoftestarelistedinthetable2.TheelementsofharmelementaredetectedbySGS.Table2Themethodsfpropertieso

13、fprepaintedsteelitemsmethodsoftestmethodsofevaluationTbendnocrackbynakedeyenotapeoffimpact9Jnotapeoffadhesionerichsendraw7mm11mmdraw，notapeoffanticrosionCCT(2hrSST4hr60℃dry2hr50℃95%RH)，30cyclethecrosionexpwidthofcutscrat

14、ch3Resultsdiscussion3.1TheinfluenceofpretreatmentconditionThepretreatmentactsasanadhesionpromotertotheganiccoatingaswellasitprovidesadditionalcrosionprotection.NmallythepassivationofpretreatmentcontainstheCr(6)whichcanim

15、provetheanticrosionproperty.WhentheenvironmentallyfriendlyprepaintedsteelproducetheprocessmustusetheCrfreesolutioninthepassivation.thepropertyofenvironmentallyfriendlyprepaintedsteelmustnotinferitotheproductwhichcontaini

16、ngtheCr(6).TheinfluencesofCrfreecontainingCrpretreatmentareinvestigated.Thelasttreatmentoftheimmersionpretreatmentisthepassivation(spray)whoseactionistheimprovinganticrosionmainly.Atthesametimeitcangetridoftheimpuritieso

17、fcompositeoxidationindertoimprovingtheadhesionofcoatingsubstrate.NmallytankofpassivationcontainCrthatwascleanedverydifficult.Sotheinfluenceofnopassivationisinvestigatedinthestudy.Table3Theinfluencesofpretreatmenttechnolo

18、giesTheadhesionthathasnopassivationisshowedintable3fig2.Tbendiswsesometimes.Thecoatingistapedoffinerichsendrawwhentheheightis11mm(but7mmisnmal).TheanticrosionisalsowseinCCT（fig3table3）.Theresultoflinetrialshowedthesimili

19、tudetrend.Sothepassivationisnecessaryinthestudyofenvironmentallyfriendlyprepaintedsteel.Thepropertiesofadhesionanticrosionofenvironmentallyfriendlyprepaintedsteelaresametoproducts(containCr)intestoftheTbendimpacterichsen

20、CCT(fig2fig3table3).Itismeansthatadoptingtheaboveprocess(compositeoxidationpassivation(Crfree))canproducetheenvironmentallyfriendlyprepaintedsteelmeetingthecustomer.numberpaltingweightofplate（gm2)pretreatmentfinishTbendi

21、mpactCCTscribe(mm)CCTcut(mm)1EG2020composteoxidationblack0T9J1.522EG2020composteoxidationpassivation(containCr)black0T9J123EG2020composteoxidationpassivation(Crfree)black0T9J124EG2020composteoxidationsilver0T9J135EG2020c

22、omposteoxidationpassivation(containCr)silver0T9J126EG2020composteoxidationpassivation(Crfree)silver0T9J127HDG6060composteoxidationwhiteB0T9J128HDG6060composteoxidationpassivation(containCr)whiteB0T9J0.519HDG6060composteo

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