金属表面处理工艺Metal surface treatment process.docx
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金属表面处理工艺Metal surface treatment process.docx
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金属表面处理工艺Metalsurfacetreatmentprocess
金属表面处理工艺(Metalsurfacetreatmentprocess)
Surfaceblackeningtreatmentprocess
Surfaceblackeningofsteelpartsprocessing,alsoknownasbarffing.Blacktreatmentnowcommonlyusedmethodshavethetraditionalalkalineheatingandblackeningofthelateappearanceoftwokindsofroomtemperature.Buttheblackeningprocessatroomtemperatureisnotverygoodforlowcarbonsteel.A3steelisslightlybetterbyalkalineblackening.Alkalineblackfractionizecomesout,haveagainblackandtwoblackdistinction.Themaincomponentsoftheblackliquoraresodiumhydroxideandsodiumnitrite.Whenyou'reblack,youneedagoodtoleranceoftemperature.Youcangetanicesurfacebetween135and155degreesCelsius,butittakesonlyalittletime.Intheactualoperation,theneedtopayattentiontoistheworkpiecebeforeblackeningandrustremovingoilquality,andblackeningafterpassivationofimmersion.Blackeningqualityisoftenduetotheseprocessesandchange.
"Blue"liquidmetal
Usingalkalineoxidationoracidoxidation;toformalayerofoxidefilmonmetalsurfacetopreventmetalsurfacecorrosion,thisprocessiscalled"blue".
Theblackmetalsurfacebythe"blue"treatmentaftertheformationoftheoxidefilm,theouterlayerismainlymagnetite,theinnerlayerisfeo.
A"blue",alkalineoxidationliquid
1.formula:
50~100gramsofsodiumhydroxideandsodiumnitratefrom600to700gramsofsodiumnitrate100~200grams1000gramsofwater
2.systemmethod:
accordingtotheformulaaftermeasuring,inthemixingconditions,inturneachmaterialtoadd,dissolve,mixevenly.
3.instructions:
(1)themetalsurfacemustbecleanedanddriedbeforethebasketcanbeprocessed.
(2)metaldevices"blue"todealwiththerelevantconditionandthemetalcarbonamount,"and"thesolutiontemperatureandthemetalcomponentcanrefertothefollowingtableintheprocessingtime.
Thecarboncontentofmetals,%operatingtemperature(DEGC),andprocessingtime(minutes)begintoterminate
>0.7135137~14310-30
0.5-0.7135140~15030-50
<0.4142145~15340-60
Alloysteel142/145~153/15560-90
(3)analyzethecontentofsodiumnitrate,sodiumnitriteandsodiumhydroxideinthesolutionregularlyeveryotherweek,soastosupplementtheingredientsintime.Generallyusesixmonthslater,youshouldreplaceallthesolution.
(4)"and"metalprocessing,preferablywithhotsoapywaterandrinseforseveralminutes,thenrinsewithcoldwater.Thenrinseitwithhotwaterandblowitdry.
Two,theacidoxidationof"blue"liquor
1.formula:
3~10gramsofcalciumphosphate80~100gramsto15gramsofmanganeseperoxide10water1000grams
2.method:
accordingtotheformulaofmeasurement,undertheconditionofcontinuouslystirring,inordertophosphoricacid,manganeseperoxideandcalciumnitrateadded,dissolving,mixing.
3.instructions:
(1)thefirstmetaldevicewashedanddriedbeforeprocessing"blue".
(2)theprotectivefilmisblack,anditsmaincomponentiscomposedofcalciumphosphateandironoxide.Itscorrosionresistanceandmechanicalstrengthareallovertheprotectivefilmobtainedbyalkalineoxidationprocess.
4."blue"workingtemperatureis100DEGC,theprocessingtimefor40~45minutes.Whendealingwithcarbonsteel,thecontentofphosphoricacidinthesolutioniscontrolledat3~5grams/liter.Whendealingwithalloysteelorcaststeel,thecontentofphosphoricacidiscontrolledat5~10grams/liter.Attentionshouldbepaidtotheregularanalysisofthecontentofphosphoricacid.
Thesamemethodforcleaningmetaldevice5."blue"aftertreatment.
Knowledgeofgalvanizing
1.Hot-dipgalvanizinghasbeendevelopedfromanoldermethodofhotplating.IthasbeenonehundredandfortyyearssinceFranceappliedhot-dipgalvanizingtoindustryin1836.However,thehot-dipgalvanizingindustryhasdevelopedrapidlyinthepastthirtyyearswiththerapiddevelopmentofcoldrolledstripsteel.
Theproductionprocessofhot-dipgalvanizedsheetmainlyincludes:
platepreparation,platingpretreatment,hot-dipgalvanizing,platingtreatment,finishedproductinspection,etc..Accordingtothehabit,oftenaccordingtothemethodbeforeplating
Differenthot-dipgalvanizingprocesscanbedividedintotwocategories,thatis,outsideannealingandlineannealing:
Wetprocess(sheetsteelhot-dipgalvanizing)
Hotdipgalvanizingofsheetsteelbyoutsideannealing
Hotdipgalvanizedwheeling(Wheeling)method(hotdipgalvanizingmethod)
Improvedannealingmethodofwireannealing(Sendzimir)method(protectivegasmethod)
UEC(JapanKawasaki)
Silas(Selas)law
Sharon(Sharon)law
1.lineannealingishotorcoldrolledsteelplateintothehotgalvanizinglinebeforethefirstpumpinghearthannealingfurnaceannealingfurnacerecrystallizationannealing,galvanizinglinethereistheannealingprocess.Acleanpureironactivesurfacewithoutoxidesandotherimpuritiesmustbemaintainedpriortohot-dipgalvanizing.Thismethodisthefirstmethodtoremovesurfaceoxidebypicklingironannealing,thencoatedbyalayerofzincchlorideoramixtureofammoniumchlorideandzincchloridesolventprotection,soastopreventthesteelplatebyoxidation.
(1)wetgalvanizing:
thesolventonthesurfaceofthesteelplatedoesnotdry(i.e.,thesurfaceisstillwet)andentersthezincliquidwhichiscoveredwithmoltensolventonthesurfaceandishot-dipgalvanized.Thedisadvantageofthismethodisthat:
A.canonlybegalvanizedinleadfreecondition,andthealloycoatingisverythickandbadadhesion.
B.generatedzincaccumulatednotdepositedtothebottomofthepotattheinterfaceofliquidzincandleadliquid(becausethezincslagisgreaterthantheproportionofliquidzincislessthantheleadliquid),sothatthesteelplatethroughthezinclayersurfacepollution.Therefore,themethodhasbeenbasicallyeliminated.
ThedifferencebetweenandDacrometgalvanizedtid=345?
(2)sheetsteel:
thismethodisgenerallyusedhotrollinglaminatedplateasrawmaterial,firstofall,theannealedsteelplateintothepicklingworkshop,withsulfuricacidorhydrochloricacidtoremovethesurfaceofthesteelsheetoxygenhotgalvanizedironsheet.Afterpickling,thesteelplateimmediatelyentersthetankandissoakedforgalvanizing,thuspreventingthesteelplatefromreoxidation.Afterpickling,cleaning,drying,drying,intothepot(thetemperaturehasremainedat445-465degreesCelsius)hotgalvanizing,andthenoiledandchromiumtreatment.Thehot-dipgalvanizedsheetproducedbythismethodhassignificantlyimprovedthequalityofwetgalvanizedproducts,andisonlyofcertainvalueforsmall-scaleproduction.
HuiLin(3):
themethodofhotcontinuousgalvanizingproductionlineincludingaseriesofpre-treatmentprocessofalkalidegreasing,hydrochloricacid,waterwashing,coatingsolvent,drying,andtheoriginalplateintobeforegalvanizinggalvanizinglineforannealingfurnace.Theproductionprocessiscomplex,theproductioncostishigh,andmoreimportantly,theproductsproducedbythismethodoftenhavesolventdefects,whichaffectthecorrosionresistanceofthecoating.AndthezincpotALoftenthesolventandthesteelsurfacefunctiontogeneratealuminumchlorideconsume,deteriorationoftheadhesionofthecoating.Althoughthismethodhasbeenpublishedfornearlythirtyyears,ithasnotbeendevelopedintheworldhotgalvanizingindustry.
2.inlineannealing:
thecoldrollingorhotrollingmillisdirectlysuppliedwiththecoilastheoriginalplateofhotgalvanizing,andthegasprotection,recrystallizationandannealingarecarriedoutinthehotgalvanizingline.Includingthehotgalvanizingmethodbelongstotheclassoftheindustry:
theSendzimirmethod,modifiedSendzimermethod,UEC(JapanKawasakiNori);Silasmethod;Sharonmethod.
SenJimmyApha:
itisacombinationofannealingprocessandhotgalvanizingprocess.Theannealinginlinemainlyconsistsoftwoparts:
theoxidationfurnaceandthereductionfurnace.Intheoxidationfurnace,thegasflameisheateddirectlytoabout450degrees.Theremainingrollingoilonthestripisburnedandthesurfaceispurified.Thestripisthenheatedto700-800degreestocompleterecrystallizationannealing,controlledbythecoolingsectionintothezincpottemperatureatabout480degrees,andfinallyinthecasedoesnotcontacttheairintothegalvanizedzincpot,therefore,highyield,goodqualitygalvanizedSendzimermethod,thismethodhasbeenwidelyapplied.
UnitedStatesSteelUnionLaw:
itisavariantofSenJimmyApha,itisonlyusinganalkalineelectrolyticdegreasingtankinsteadofoxidationfurnacedegreasingfunction,andtherestoftheprocessandSenJimmyAphabasicallythesame.Aftertheoriginalplateenterstheoperationline,theelectrolyticdegreasingiscarriedoutfirst,thenthewateriswashedanddried,andthentherecrystallizationannealingiscarriedoutthroughareducingfurnacewithprotectivegas.Finally,thezincisdippedintothezincpottobehot-dipgalvanizedunderthesealcondition.
Becausethestripisnotheatedbytheoxidationfurnace,thesurfaceoxidefilmisthinner,andthehydrogencontentoftheprotectivegasinthereducingfurnacecanbeappropriatelyreduced.Inthisway,itisbeneficialtofurnacesafetyandproductioncostreduction.However,asthestripcannotbepreheated,itentersthereductionfurnace,whichundoubtedlyimprovestheheatloadofthereductionfurnaceandaffectstheservicelifeofthefurnace.Therefore,thismethodhasnotbeenwidelyapplied.
SilasLaw:
alsoknownasdirectflameheatingmethod;firststri
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