Comprehensive pickling thiabpassivation ntawm stainless hlau, tshem tawm ntau yam roj stains, xeb, oxide daim tawv nqaij, solder pob qij txha thiab lwm yam av.Tom qab kev kho mob, qhov saum npoo yog uniformly silver dawb, zoo heev txhim kho corrosion kuj ntawm stainless hlau, haum rau ntau yam stainless hlau qhov chaw, daim hlau thiab khoom siv.
Yooj yim rau kev khiav lag luam, yooj yim rau siv, kev lag luam thiab siv tau, nrog rau kev sib ntxiv ntawm kev ua haujlwm siab corrosion inhibitors los tiv thaiv cov hlau corrosion thiab hydrogen embrittlement, thiab txhawm rau txhawm rau tsim cov kua qaub.Tshwj xeeb tshaj yog tsim rau me me thiab complex workpieces, tsis haum rau txheej, superior rau cov khoom zoo sib xws ntawm kev ua lag luam.
Raws li qhov hnyav ntawm cov khoom siv stainless hlau thiab oxide nplai, cov tshuaj qub tuaj yeem siv los yog diluted nrog dej hauv qhov sib piv ntawm 1: 1: 1-4 ua ntej siv;Ferrite, Martensite thiab austenitic stainless hlau uas tsis tshua muaj nickel cov ntsiab lus (xws li 420.430.200.201.202.300. Tom qab dilution, austenitic stainless hlau nrog cov ntsiab lus nickel siab (xws li 304), 321.316.316L, thiab lwm yam.) yuav tsum tau muab tso rau hauv cov tshuaj;Feem ntau, tom qab ib txwm kub lossis cua sov rau 50 ~ 60 ℃, tsau rau 3-20 feeb lossis ntev dua (lub sijhawm tshwj xeeb thiab kub yuav tsum tau txiav txim los ntawm tus neeg siv raws li qhov kev sim) kom txog thaum cov av tshem tawm tag nrho, sib npaug ntawm cov xim dawb. , tsim ib tug niaj hnub thiab tuab passive zaj duab xis.Tom qab kev kho mob, tshem nws tawm, ntxuav nws nrog dej huv, thiab neutralize nws nrog alkaline dej los yog Limewater.
Qhov tsim nyog ntawm stainless hlau pickling thiab passivation
Stainless hlau muaj kev tiv thaiv corrosion zoo, kub-kub oxidation tsis kam, ua haujlwm kub qis, thiab zoo txhua yam thiab R zog.Yog li ntawd, nws yog dav siv nyob rau hauv tshuaj, roj av, fais fab, Nuclear engineering, aerospace, marine, tshuaj, lub teeb kev lag luam, textile thiab lwm yam sectors.Nws lub hom phiaj tseem ceeb yog los tiv thaiv corrosion thiab xeb.Kev tiv thaiv corrosion ntawm stainless hlau tsuas yog nyob ntawm qhov chaw passivation zaj duab xis.Yog tias cov yeeb yaj kiab tsis tiav lossis tsis zoo, stainless hlau tseem yuav raug corroded.Acid pickling thiab passivation feem ntau yog siv hauv engineering los txhim kho corrosion kuj ntawm stainless hlau.Thaum lub sij hawm tsim, sib dhos, vuam, kev soj ntsuam vuam (xws li kev kuaj xyuas qhov tsis zoo, kev ntsuas siab), thiab kev tsim cov txheej txheem ntawm cov khoom siv stainless hlau thiab cov khoom siv, cov roj av stains, xeb, cov av tsis yog xim hlau, cov hlau tsis muaj kuab paug, cov xim tsis zoo, welding slag, thiab splashes tuaj yeem cuam tshuam rau qhov zoo ntawm cov khoom siv hlau stainless thiab cov khoom siv, ua rau cov oxide zaj duab xis rau ntawm lawv qhov chaw, txo cov corrosive thiab hauv zos corrosiveness ntawm cov hlau (xws li pitting corrosion), qhov sib txawv corrosion), thiab txawm ua rau kev nyuaj siab corrosion cracking. .
Kev ntxuav ntawm cov hlau tsis huv, pickling thiab passivation tuaj yeem tsis tsuas yog txhim kho corrosion mus rau qhov siab tshaj plaws, tab sis kuj tiv thaiv cov khoom sib kis thiab ua kom zoo nkauj.GBl50-1998 "Steel Pressure Vessels" qhia tias qhov chaw ntawm cov thawv ua los ntawm cov hlau tsis muaj steel thiab cov hlau sib xyaw yuav tsum tau khaws thiab ua kom tsis muaj zog.Txoj cai no siv tau rau cov hlab ntsha uas siv hauv kev lag luam petrochemical.Raws li cov khoom siv no yog siv nyob rau hauv cov xwm txheej uas lawv tuaj rau hauv kev sib cuag ncaj qha nrog cov xov xwm corrosive, nws yog ib qho tsim nyog los tawm tswv yim acid pickling thiab passivation los ntawm qhov kev xav ntawm kom ntseeg tau tias corrosion kuj thiab corrosion kuj.Rau lwm qhov kev lag luam, yog tias nws tsis yog rau kev tiv thaiv corrosion, nws tsuas yog ua raws li cov kev cai ntawm kev huv thiab zoo nkauj, thaum stainless hlau tsis xav tau pickling thiab passivation.Tab sis cov welds ntawm stainless hlau cov cuab yeej tseem xav tau pickling thiab passivation Rau qee cov khoom siv tshuaj nrog cov kev cai nruj rau kev siv, ntxiv rau acid tu thiab passivation, siab purity nruab nrab kuj yuav tsum tau siv rau qhov kawg fine tu los yog mechanical tu, tiav chemistry thiab Electropolishing.
Cov ntsiab lus ntawm Stainless Hlau Pickling thiab Passivation
Lub corrosion tsis kam ntawm stainless hlau yog feem ntau vim yog qhov tseeb tias qhov chaw yog them nrog qhov tsis tshua muaj neeg sib xyaw ua ke, uas yog qhov yooj yim ntawm stainless hlau tiv thaiv.Stainless hlau passivation muaj dynamic yam ntxwv thiab yuav tsum tsis txhob muab suav hais tias raws li ib tug tag nrho cessation ntawm corrosion.Hloov chaw, yuav tsum tsim cov txheej txheem diffusion barrier, txo cov tshuaj tiv thaiv anode zoo heev.Feem ntau, thaum muaj tus neeg sawv cev txo qis (xws li chloride ions), daim nyias nyias yuav ua rau puas tsuaj, thiab thaum muaj oxidizing tus neeg sawv cev (xws li huab cua), daim nyias nyias tuaj yeem khaws lossis kho.
Stainless hlau workpieces muab tso rau hauv huab cua yuav tsim oxide zaj duab xis, tab sis lawv cov kev tiv thaiv tsis zoo tag nrho.Feem ntau, kev tu kom huv yog ua ntej, suav nrog alkaline thiab kua qaub ntxuav, ua raws li passivation nrog oxidant kom ntseeg tau tias kev ruaj ntseg thiab ruaj khov ntawm cov yeeb yaj kiab passivation.Ib qho ntawm cov hom phiaj ntawm pickling yog los tsim cov kev mob zoo rau kev kho mob passivation thiab xyuas kom muaj kev tsim cov yeeb yaj kiab zoo passivation.Acid ntxuav ua rau corrosion ntawm stainless hlau nto nrog ib tug nruab nrab thickness ntawm 10m.Cov tshuaj lom neeg ua haujlwm ntawm cov kua qaub ua rau qhov kev sib cais ntawm qhov chaw tsis raug siab dua li lwm qhov ntawm qhov chaw.Yog li ntawd, kev ntxuav cov kua qaub tuaj yeem ua rau tag nrho qhov chaw sib npaug thiab tshem tawm qee qhov kev phom sij corrosion.Tab sis qhov tseem ceeb tshaj, los ntawm acid pickling thiab passivation, hlau thiab hlau oxides yaj ntau dua chromium thiab chromium oxides, tshem tawm cov pluag chromium txheej, uas ua rau nplua nuj chromium nyob rau saum npoo ntawm stainless hlau.Lub peev xwm ntawm cov nplua nuj chromium passivation zaj duab xis tuaj yeem ncav cuag + 1.0V (SCE), uas nyob ze rau lub peev xwm ntawm cov hlau muaj txiaj ntsig thiab txhim kho kev ruaj ntseg ntawm corrosion kuj.Cov kev kho mob sib txawv kuj tseem tuaj yeem cuam tshuam qhov muaj pes tsawg leeg thiab cov qauv ntawm cov yeeb yaj kiab, yog li cuam tshuam rau nws cov corrosion kuj.Piv txwv li, los ntawm kev kho electrochemical hloov kho, cov zaj duab xis passivation tuaj yeem muaj ntau txheej txheej thiab tsim CrO3 lossis Cr2O3 hauv txheej txheej, lossis tsim cov iav oxide zaj duab xis los txhim kho corrosion ntawm stainless hlau.
1.Stainless steel pickling thiab passivation txoj kev
Txoj kev impregnation yog siv rau qhov chaw uas tuaj yeem muab tso rau hauv pickling lossis passivation tso tsheb hlau luam, tab sis nws tsis haum rau kev siv lub sij hawm ntev ntawm pickling kua hauv cov cuab yeej loj, nrog rau kev ua haujlwm siab thiab tus nqi qis;Cov khoom ntim loj yog ntim nrog cov kua qaub, thiab cov kua immersion noj yog siab dhau.
Haum rau sab hauv thiab sab hauv lub cev ua haujlwm ntawm cov khoom siv loj.Kev ua haujlwm tsis zoo thiab tsis muaj peev xwm rov qab tau cov kua qaub.
Txoj kev muab tshuaj txhuam yog siv rau ntawm qhov chaw teeb tsa lossis kev saib xyuas, tshwj xeeb tshaj yog rau kev ua haujlwm ntawm kev tuav hauv vuam department.Cov kev ua haujlwm tsis zoo thiab cov nqi tsim khoom yog siab.
Cov txheej txheem tshuaj tsuag yog siv rau ntawm qhov chaw teeb tsa, nrog cov kua ntim tsawg ntawm cov phab ntsa sab hauv ntawm cov thawv loj, tus nqi qis, thiab kev ceev ceev, tab sis yuav tsum muaj kev teeb tsa ntawm rab phom tsuag thiab lub voj voog.
Txoj kev ncig yog siv rau cov khoom siv loj, xws li cov khoom siv hluav taws xob.Kev tsim kho lub raj thiab lub plhaub yog yooj yim, thiab cov kua qaub tuaj yeem rov qab siv dua.Nws yuav tsum tau piping thiab twj tso kua mis kev twb kev txuas mus rau lub circulation system.
Electrochemical txoj kev tuaj yeem tsis tsuas yog siv rau qhov chaw, tab sis kuj rau kev kho deg ntawm cov khoom siv ntawm qhov chaw.Cov thev naus laus zis yog qhov nyuaj thiab xav tau DC fais fab mov lossis potentiostat.
2.Pickling thiab passivation txheej txheem
Degreasing thiab ntxuav cov av → Ntxuav cov dej purification → Passivation → Ntxuav nrog dej huv → Tshuab ziab
3.Pretreatment ua ntej pickling thiab passivation
3.1 Raws li cov kev xav tau ntawm cov duab kos thiab cov ntaub ntawv txheej txheem, ua cov kua qaub pickling thiab passivation ua ntej kev kho mob ntawm stainless hlau ntim lossis qhov chaw tom qab kev tsim khoom.
3. Weld seam thiab vuam slag ntawm ob sab.Ntxuav cov splashes, thiab siv cov roj av los yog cov tshuaj ntxuav kom tshem tawm cov roj stains thiab lwm yam av ntawm qhov chaw ntawm lub thawv ntim khoom.
3.3 Thaum tshem cov khoom txawv teb chaws ntawm ob sab ntawm lub vuam seam, siv cov hlau tsis xeb hlau txhuam, stainless hlau shovel los yog sib tsoo log kom tshem tawm lawv, thiab yaug lawv nrog dej huv (nrog cov tshuaj chloride ion tsis tshaj 25mg / l).
Thaum cov roj stain hnyav, siv 3-5% alkaline tov kom tshem tawm cov roj stain thiab yaug kom huv si nrog dej huv.
3. Mechanical xuab zeb blasting tuaj yeem tshem tawm cov tawv nqaij oxide ntawm stainless hlau kub ua haujlwm, thiab cov xuab zeb yuav tsum yog cov ntshiab silicon lossis aluminium oxide.
3.6 Tsim kev ntsuas kev nyab xeeb rau pickling thiab passivation, thiab txiav txim siab cov cuab yeej tsim nyog thiab cov cuab yeej tiv thaiv kev ua haujlwm.
4.Acid pickling, passivation tov thiab muab tshuaj txhuam mis
4.1 Acid ntxuav kua mis: nitric acid (1).42) 20%, hydrofluoric acid 5%, thiab tus so yog dej.Cov saum toj no yog qhov ntim feem pua.
4.2 Acid cleaning cream formula: 20 milliliters of hydrochloric acid ( ratio 1.19), 100 milliliters dej, 30 milliliters nitric acid ( ratio 1.42), thiab 150 grams bentonite.
4. Passivation tov mis: nitric acid (tus piv 1).42) 5%, Potassium dichromate 4g, tus so yog dej.Qhov saum toj no feem pua ntawm fallout, passivation kub yog chav tsev kub.
4.4 Passivation paste mis: 30ml nitric acid (concentration 67%), 4g Potassium dichromate, ntxiv bentonite (100-200 mesh) thiab do kom muab tshuaj txhuam.
5.Acid pickling thiab passivation ua haujlwm
5.1 Tsuas yog cov ntim khoom lossis cov khoom uas tau ua dhau los thiab kev kho mob ua ntej tuaj yeem ua rau pickling thiab passivation.
5. 2 Acid pickling tov yog tsuas yog siv rau tag nrho cov kev kho mob ntawm me me unprocessed qhov chaw, thiab yuav tsum sprayed.Cov tshuaj kub yuav tsum tau kuaj xyuas txhua 10 feeb ntawm qhov kub ntawm 21-60 ℃ kom txog thaum muaj cov kua qaub dawb etching tiav.
5.3 Pickling paste Pickling feem ntau yog tsim rau cov ntim loj lossis ua haujlwm hauv zos.Nyob rau hauv chav tsev kub, tusyees ntxuav lub pickling muab tshuaj txhuam rau ntawm cov khoom (kwv yees li 2-3 hli tuab), tawm rau ib teev, thiab maj mam txhuam nrog dej los yog stainless hlau hlau txhuam kom txog thaum ib tug uniform dawb acid etching tiav.
5.4 Passivation tov yog tsim nyog rau tag nrho cov kev kho mob ntawm cov thawv me me los yog cov khoom, thiab tuaj yeem muab tso rau hauv dej lossis txau.Thaum cov tshuaj kub yog 48-60 ℃, xyuas txhua 20 feeb, thiab thaum cov tshuaj kub yog 21-47 ℃, xyuas txhua txhua teev kom txog rau thaum ib tug uniform passivation zaj duab xis yog tsim rau saum npoo.
5.5 Passivation paste yog tsim rau cov ntim loj lossis ua haujlwm hauv zos.Nws yog sib npaug rau saum npoo ntawm lub thawv ntim khoom (kwv yees li 2-3 hli) ntawm chav tsev kub thiab tshuaj xyuas rau 1 teev kom txog thaum cov yeeb yaj kiab passivation tsis sib xws ntawm qhov chaw.
5.6 Acid pickling thiab passivation ntim los yog qhov chaw yuav tsum tau muab yaug nrog dej huv ntawm qhov chaw., siv cov ntawv ntsuas acidic litmus los ntsuas ib feem ntawm qhov chaw ntxuav, txhawm rau txhawm rau yaug qhov chaw nrog dej nrog tus nqi pH ntawm 6.5 thiab 7.5, thiab tom qab ntawd so lossis tshuab ziab nrog cua compressed.
5.7.Tom qab pickling thiab passivation, nws yog txwv tsis pub khawb cov zaj duab xis passivation thaum tuav, nqa, thiab khaws cia ntim thiab qhov chaw.
Post lub sij hawm: Aug-08-2023