Nyob rau hauv cov teb ntawm cov ntaub ntawv txuj ci, engineering, thiab kev tsim khoom, kev ua tau zoo ntawm kev ua kom pom kev sib luag ntawm cov tshuaj lom neeg lossis kev siv hluav taws xob nrog rau ib puag ncig ib puag ncig. Txhawm rau tawm tsam cov teeb meem no, ntau hom kev kho mob ntau yam kev kho mob tau tsim los ua cov tshuaj txhuam, ua tau yooj yim, thiab yooj yim}- siv cov tshuaj. Tsis zoo li ua kua rau cov kua uas yuav tsum tau siv cov yeeb yaj kiab uas tsis muaj peev xwm ua ke, lossis cov khoom siv passivation ua ke, lossis cov khoom sib cav sib txawv, thiab kev yoog raws li cov chaw tsis xwm yeem. Kab lus no aims los muab ib qho kev qhia dav dav ntawmpassivationPaste, suav nrog nws txhais, muaj pes tsawg leeg, ua haujlwm mechanism, kev siv, cov txheej txheem xaiv, kev siv cov txheej txheem, thiab yav tom ntej. Los ntawm tshawb nrhiav cov no, cov neeg nyeem yuav tau txais kev nkag siab meej txog dab tsi passivation muab tshuaj txhuam yog thiab vim li cas nws tau dhau los ua kev lag luam tsis tseem ceeb hauv kev lag luam niaj hnub.
Kev txhais thiab cov yam ntxwv ntawm passivation paste
Txhawm rau teb cov lus nug "Dab tsi yog passivation muab tshuaj txhuam?", Thawj kauj ruam yog kom meej nws cov ntsiab lus txhais thiab paub qhov txawv ntawm lwm cov ntaub ntawv passivation. Thaub passivation yog asemi - cov khoom lossis muab tshuaj txhuam - zoo li cov khoom siv ua haujlwmTsim los ua ib qho nyias nyias, ntom ntom ntom, thiab ruaj ntseg tiv thaiv (hu ua zaj duab xis passive) ntawm cov hlau nto. Zaj yeeb yaj kiab no ua yeeb yam ntawm lub cev thiab tshuaj lom neeg, xws li oxygen, kua qaub, thiab ntsev) thiab yog li ntsev rau lossis ua kom qeeb dua. Tsis zoo li kua passivants (piv txwv li cov kev daws teeb meem aqueous Qhov viscosity no tso cai rau nws mus ua raws li cov hlau nto rau lub sijhawm ntev, kom muaj sijhawm txaus rau cov kev hloov pauv rau cov neeg passive.
Cov ntsiab lus tseem ceeb uas txhais tau cov neeg ua haujlwm passivation
Cov yam ntxwv tshwj xeeb ntawm passivation paste yog txiav txim los ntawm nws cov txheej txheem ua tib zoo ua haujlwm ua ke kom ua tiav passivation. Cov feem no feem ntau suav nrog plaub qhov tseem ceeb:
Passivator (nquag xyaw): Qhov no yog lub plawv ntawm passivation paste, lub luag haujlwm rau pib cov kev sib tw passive nrog cov hlau nto. Cov neeg hla passivator ntau sib txawv raws li hom hlau los kho. Rau cov hlau stainless, nitric acid, citric acid, lossis lawv cov ntsev (piv txwv li, sodium nitrate, ammonium citrate) tau siv dav; Cov tshuaj no muaj cov tshuaj, cov roj chromium, thiab npib tsib xee hauv stainless hlau los tsim cov chromium {}} rich oxide zaj duab xis. Rau txhuas thiab nws cov alloys, phosphoric acid, lossis zirconium-}}}} ating alide oxide lossis composite oxide zaj duab xis. Rau tooj liab thiab tooj liab alloys, benzotriazole (BTA) lossis nws cov derivatives yog siv ntau, uas tau siv cov nkauj pheeb suab nrog tooj liab ions los tiv thaiv oxidation.
Binder (Viscosity Regulator): Lub binder yog dab tsi muab passivation muab tshuaj txhuam nws cov tshuaj txhuam - zoo li sib xws. Nws kom ntseeg tau tias cov khoom noj ua ke rau cov hlau saum npoo av uas tsis muaj kev tsis muaj los yog ntws lossis ntws los yog ntsug. Cov kev sib tsoo xws li cov organic polymers (piv txwv li, cov dej cawv polyvinyl, acrylic resins) thiab inorganic khi (piv txwv li, silica sol, alumina gel). Organic Binders muab kev hloov pauv tau zoo thiab cov khoom sib xyaw, thaum inorganic binders pab txhawb rau lub siab kub.
Ntxiv (Kev Ua Haujlwm Txhim Kho): Cov khoom ntxiv tau ntxiv rau hauv cov khoom me me kom ua kom tiav cov kev ua tau zoo ntawm passive muab tshuaj txhuam. Lawv suav nrog:
Corrosion Inhibitors: Txhim kho cov nyhuv tiv thaiv ntawm tus passivation zaj duab xis los ntawm kev txhawb nqa hauv zos electrochemical cov tshuaj tiv thaiv (piv txwv li Sodium molybdate rau stainless hlau).
Tuab: Kho lub viscosity ntawm paste kom tau raws li cov kev thov sib txawv (piv txwv li, cellulose cellulose).
Stabilizers: Tiv thaiv cov passivator los ntawm decomposing lossis deteiorating thaum lub sij hawm cia (piv txwv li, urea rau cov kua qaub {} raws cov passivators).
Cov chaw ntub dej: Txhim kho lub wettability ntawm cov tshuaj txhuam ntawm covHlau Hlau, kom cov kev pab them nqi tsis zoo (piv txwv li, tsis- ionic surfactants li Tween 80).
Hnyav (Cov Khoom Siv): Cov kuab tshuaj tau ploj los yog disperses cov passivator, binder, thiab ntxiv, tsim homogeneous paste. Dej yog cov kev siv daws tau tshaj plaws vim nws tus nqi qis, kev nyab xeeb, thiab ib puag ncig ua phooj ywg. Muaj qee kis, organic kuab (xws li ethanol, propylene glycol) yog siv rau kev siv nyiaj passion uas ib puag ncig lossis dej sov- rhiab hlau.
Cov yam ntxwv tseem ceeb uas paub qhov txawv ntawm passion
Piv nrog rau lwm cov thev naus laus zis thev naus laus zis, passivation paste muaj cov yam ntxwv sib txawv hauv qab no:
Siab adhesion thiab phiaj ntawv thov: The paste's viscosity enables it to adhere to any metal surface-whether flat, curved, or irregular-without the need for specialized equipment. Qhov no ua rau nws zoo tagnrho rau kev kho cov khoom loj (piv txwv li, nkoj lub nkoj (piv txwv li nyuaj rau cov kua uas hla dhau.
Lub sijhawm uas tau tawm tsam: Tsis zoo li cov khoom ua kua zaub mov ua kom dhau los (ua kom muaj kev sib chwv nrog cov hlau mus rau lub sijhawm kho tau (feem ntau 30 feeb rau 24 teev). Qhov no tso cai rau cov chaw tsim khoom los tswj cov tuab thiab ntom ntawm passive zaj duab xis raws li cov cai.
Tsawg ib puag ncig ib puag ncig (rau cov qauv niaj hnub): Cov ntaub ntawv passivation (piv txwv li, chromate {{2} Txawm li cas los xij, feem ntau cov neeg passeation tshiab ua cov qauv siv tsis {{{{{{{{{{{{{{{{{}, {}, {}, {, EU lub npe ncav txoj cai).
Sib sau nrog post -} cov txheej txheem kho: Tom qab cov kev tawm tsam passive tiav lawm, passivation muab tau yooj yim los ntawm ntxuav cov yeeb yaj kiab uas tsis cuam tshuam nrog cov txheej txheem tom ntej xws li tha xim,daim plhaub, lossis sib dhos.
Ua haujlwm Mechanism ntawm passivation paste
Nkag Siab Ua kom cov qaib muab tshuaj txhuam ua haujlwm yog qhov tseem ceeb rau kev tiv thaiv nws tus nqi hauv kev tiv thaiv corrosion. Lub ntsiab cai tseem ceeb ntawm passivation paste yog siv nws cov nquag tiv thaiv kom ua rau cov hlau sib dhos, ua rau muaj kev tsim ntawm cov yeeb yaj kiab passivation. Txoj kev no tuaj yeem faib ua peb ntu ntu: kev ua kom nto, zaj duab xis, thiab zaj duab xis ua kom ruaj khov. Thoob plaws cov theem, passivionation ua kom cov tshuaj tiv thaiv, hnav ris tsho, thiab ua lub siab- zoo tiv thaiv zaj duab xis.
Theem 1: Kev ua kom ncaj qha los ntawm passivation muab tshuaj txhuam
Ua ntej cov neeg hla kev hla kev tuaj yeem tsim, cov hlau nto yuav tsum muaj cov tshuaj paug (piv txwv li cov roj, xeb, xeb, cov tshuaj tiv thaiv ntawm cov neeg passtrate. Passivation paste ua lub luag haujlwm ntawm ob lub luag haujlwm ntawm no: nws tsis tsuas yog ua rau tus neeg passivator tab sis kuj muaj cov kev pab ua kom cov hlau nto.
Thaum passivation muab tshuaj txhuam yog thov rau cov hlau saum npoo, cov acidic lossis chelating passivator hauv cov paste ua ntej kis tau. Piv txwv li, yog tias cov hlau muaj xeb (hlau oxide), cov roj nitric inleidation: fe₂o₃} hnoos → 2fe (No₃)}} h₂o. Nyob rau tib lub sijhawm, cov passivator me ntsis etches cov hlau saum npoo av, feem ntau yog ob peb nanometers tuab). Qhov txheej txheem etching no nthuav tawm cov hlau tshiab, tsim cov tshuaj lom neeg xws li muaj cov xwm txheej ua kom zoo rau zaj yeeb yaj kiab txuas ntxiv.
Nws yog ib qho tseem ceeb kom nco ntsoov tias kev ua kom dhau los ntawm passivation muab tshuaj txhuam yogmob me thiab tswjCov. Tsis zoo li muaj zog acid pickling (uas tuaj yeem tshaj {{}}}}}}}} reactionုT cov hlau thiab cov neeg tiv thaiv tau raug kho kom tsis txhob muaj kev puas tsuaj rau kev ua kom puas tsuaj rau kev ua kom puas tsuaj rau kev ua kom puas tsuaj.
Theem 2: Zaj duab xis muaj kev tawm tsam tsav los ntawm passivation paste
Tom qab kev ua kom sib txawv ntawm kev ua kom ncaj, cov passivator hauv passivation paste reacts nrog cov hlau ions (tso tawm los ntawm cov tshiab substrate) los ua yeeb yaj kiab passivation. Cov tshuaj tiv thaiv yog nyob ntawm cov hlau thiab cov passivator siv:
Oxidation - kev tawm tsam txo qis (rau cov hlau stainless thiab txhuas): Rau cov hlau stainless, cov chromium hauv cov hlau reacts nrog cov nqaij qaib ua kom cov tawv nqaij tawv nqaij tawv nqaij rau cov yeeb yaj kiab passivation. Cov kev sib npaug ntawm cov tshuaj tiv thaiv yog: 2cr {{2} hnoo₃ → croo₃ {}}} h₂o. Qhov no cov yeeb yaj kiab chromium oxide tsis muaj tuab heev Rau txhuas, phosphoric acid nyob rau hauv lub passivation muab tshuaj txhuam reacts nrog txhuas phosphate (alpo₄), uas ua ke ua yeeb yaj kiab nrog cov yeeb yaj kiab uas zoo heev.
Kev xav txawv (rau tooj liab thiab tooj liab alloys): Rau tooj liab, Benzotriazole (BTA) hauv qhov passivation tus neeg ua yeeb yam raws li tus neeg sawv cev chelating, sib sau ua ke nrog tooj liab ions (cu²⁺) rau saum npoo. Qhov kev ua yeeb yaj kiab no ua yeeb yaj kiab kom nruj nreem rau cov tooj liab thiab oxygen lossis dej, yog li kev tsim cov tooj liab oxide (patina) thiab txuas ntxiv.
Thaum lub sijhawm zaj duab xis tsim theem, lub viscosity ntawm passivation paste lub luag haujlwm tseem ceeb. Nws kom ntseeg tau tias cov passivator tseem nyob rau hauv kev sib cuag nrog cov hlau saum npoo, tiv thaiv cov khoom lag luam tawm los ntawm raug ntxuav lossis ua rau yav tom ntej. Qhov kev sib chwv no tso cai rau cov zaj duab xis passivation kom loj hlob maj mam maj mam, ua kom nruj thiab muaj ntau yam kev hnav khaub ncaws.
Theem 3: Zaj duab xis ruaj khov thiab tshaj tawm - kev kho mob ntawm passivation
Thaum cov zaj duab xis passed yog tsim, theem kawg yog muaj stabilizing cov yeeb yaj kiab thiab tshem cov passidual passede. Tus passivation zaj duab xis, txawm hais tias thaum pib tsim, tej zaum yuav muaj cov hws me me lossis thaj chaw tsis tiav. Txhawm rau hais txog qhov no, qee cov passivation paste formulations muaj cov stabilizers uas hnov cov ua yeeb yaj kiab los sau cov hws no thiab txhim kho nws qhov ruaj khov. Piv txwv li, hauv zirconium {{3} Raws li cov tshuaj pleev xim rau cov xim zirconium los ua cov tshuaj txhuam oxide}} ions reedant rau acid thiab alkali.
Tom qab cov txheej txheem stabilization, cov passidual passivation yuav tsum tau muab tshem tawm. Qhov no feem ntau ua tau los ntawm kev ntxuav cov nplaim dej nrog (rau dej -}}} - ua tshuaj txhuam). Qhov kev tshem tawm ntawm cov khoom seem uas tseem ceeb heev vim tias muaj cov seem passivator (tshwj xeeb yog cov acidic lossis alkaline) tuaj yeem ua rau muaj kev xeb hauv zej zog. Tom qab tu, cov hlau saum npoo av yog qhuav, tawm ntawm daim nyias nyias, pob tshab passivation zaj duab xis uas tsis cuam tshuam rau cov tsos ntawm cov khoom siv.
Daim Ntawv Thov Kev Ua Haujlwm Passivation
Passivation muab tshuaj txhuam rau cov versatility - Nws yoog tau cov khoom siv sib txawv, thiab muaj ntau yam siv tau dav hauv ntau yam lag luam. Los ntawm Aerospace rau cov khoom siv hauv tsev neeg, luam tawm ib qho kev ua haujlwm tseem ceeb hauv kev pabcuam lub neej ntawm kev ua haujlwm ntawm lub neej thiab ua kom lawv ua tau zoo tshaj plaws. Hauv qab no yog cov ntawv thov tseem ceeb, txhua qhov tseem ceeb li cas passivation muab tshuaj txhuam tshwj xeeb cov kev sib tw kev lag luam kev lag luam.
Aerospace kev lag luam: ua kom muaj kev ntseeg siab ntawm cov khoom siv nrog passivation muab tshuaj txhuam
Lub Aerospace kev lag luam muaj cov teeb meem tsis tshua muaj xim hlau, vim tias lawv yuav tsum tiv thaiv ib puag ncig muaj kev ntxhov siab, thiab raug cov kua thiab roj. Cov hlau siv hauv aerospace suav nrog cov roj titanium suav nrog alloys txhuas, thiab stainless hlau, txhua yam uas yuav tsum muaj kev tiv thaiv corrosion zoo. Thaseivation passque tshwj xeeb yog tsim nyog rau qhov kev lag luam no vim nws lub peev xwm los kho cov complex, thiab cov txheej txheem dav hlau, thiab cov khoom siv khov kho) uas yog cov ua kua rau cov kua.
Piv txwv li, cov dav hlau cav tuaj yeem ua haujlwm (ua los ntawm titanium alloys) yog siv los ntawm cov tshuaj ntsev (los ntawm cov dej hiav txwv ntawm cov av hauv hiav txwv (los ntawm cov dej hiav txwv. Titanium {{{2} Raws passionive paste, muaj cov oxalic acid lossis hydrogen peroxide raws li cov neeg passion titanium oxide zaj duab xis ntawm cov hniav ua si. Daim yeeb yaj kiab no tsis yog tivthaiv tshuaj tsuag ntsev tab sis tseem tswj hwm kev ruaj khov ntawm qhov kub (txog 600 degree), kom ntseeg tau tus hniav ntev {5} kev ua haujlwm ntev. Tsis tas li ntawd, passivity muab tshuaj txhuam yog siv los kho Weld seams ntawm cov dav hlau fuselages (ua los ntawm txhuas alloys). Weld Seams feem ntau yog cov muaj kev phom sij rau corrosion vim cua sov - cuam tshuam zones thiab seem kev nyuaj siab; Thaub passivation yog thov ncaj qha rau cov chaw no, sib sau ua yeeb yaj kiab tiv thaiv uas tshem tawm txoj kev pheej hmoo corrosion.
Kev Lag Luam Automotive: Txhim Kho Durability ntawm Qhov Nrog Passivation Paste
Kev lag luam automotive nyob ntawm ntau me me ntawm cov hlau nplaum, los ntawm cov chassis thiab lub cav rau cov khoom me me xws li bolts thiab txiv ntoo. Cov khoom sib xyaw no raug rau nag, kev seev cev (hauv lub caij ntuj no), thiab tso pa tawm, ua kom corrosion ib qho kev txhawj xeeb loj. Passivation paste is used in both the manufacturing of automotive parts and post-repair maintenance.
Hauv kev tsim cov stainless hlau tso tawm, kis passivation tau muab tso rau sab hauv thiab sab nraud ntawm kev tso pa sab hauv thiab sab nraud. Lub siab - kub-}}} {{}}}}} corr} temperature exhaustes moist exhaust້ນ thiab noo noo. Rau txhuas lub log log, zirconium - Raws li kev muab tshuaj txhuam uas tau muab ua ntej tha xim. Tus passivation zaj duab xis txhim kho cov nplaum ntawm cov xim rau lub log nto, tiv thaiv cov xim los ntawm cov xim pleev xim thiab ua rau txhuas kom corrosion. Tsis tas li ntawd, thaum lub sijhawm tu tsheb ntxiv, hla passe yog siv los kho cov chaw xeb ntawm cov chassis. TusMuab cov diav rawgLub teeb xeb thiab cov ua yeeb yaj kiab tiv thaiv, txuas ntxiv ntawm chassis lub neej pabcuam.
Electronics thiab hluav taws xob kev lag luam: tiv thaiv cov precision Cheebtsam nrog passivation muab tshuaj txhuam
Hauv cov khoom siv hluav taws xob thiab kev lag luam hluav taws xob, cov khoom siv hluav taws xob, xws li cov cim luam tawm hluav taws xob (PCBs), cov cores, thiab transformer cores) yog rhiab heev rau corrosion. Txawm tias muaj kev tiv thaiv me me tuaj yeem ua rau muaj kev sib cuag hluav taws xob tsis zoo, lossis khoom siv tsis ua haujlwm. Thaub passivation yog qhov zoo tagnrho rau kev lag luam no vim tias nws tuaj yeem siv rau hauv thaj chaw me me, yam tsis muaj kev ua kom cov khoom siv hluav taws xob ze.
Piv txwv li, tooj txuas tooj liab ntawm cov PCBs feem ntau yog tus mob oxidation, uas nce hluav taws xob tsis kam. Benzotriazole (BTA) {{{{{{1} Raws li cov txhuam hniav uas siv rau cov txhuam hniav me me lossis cov foob pob. Tus muab tshuaj txhuam cov yeeb yaj kiab nyias nyias chelating rau ntawm cov tooj liab, tiv thaiv oxidation thiab ua kom muaj kev ruaj ntseg ruaj khov. Rau kev hloov pauv cores ua los ntawm silicon cov ntawv txheeb, muab cov tshuaj txhuam hniav (muaj cov phosphoric acid thiab sillica sol) yog siv los ua tus insulating ua yeeb yaj kiab ntawm cov ntawv txheeb. Zaj yeeb yaj kiab no tsis yog txwv tsis pub corrosion tab sis kuj tseem txo eddy tam sim no poob, txhim kho cov hloov pauv tau zoo.
Cov Khoom Siv Hauv Tsev Neeg thiab Kev Txhim Kho Txhua Yam: Kev Txhim Kho Cov Neeg Siv Cov Neeg Siv nrog Passivation Paste
Cov Khoom Siv Hauv Tsev (piv txwv li, tub yees, tshuab ntxhua khaub ncaws, thiab cov khoom noj ua noj (piv txwv li, thiab kev ua kom huv thiab kev nyiam huv thiab kev nyiam huv. Hla kev muab tshuaj txhuam yog siv nyob rau hauv kev tsim khoom ntawm cov khoom lag luam no kom ntseeg tau tias lawv yog corrosion - tiv taus thiab muaj kev nyab xeeb rau siv.
Rau stainless hlau cookware (piv txwv li, lauj kaub thiab lauj kaub), citric acid {{2} Raws li cov neeg sab hauv. Cov tshuaj txhuam cov ntaub qhwv ib qho chromium {{4 4}} rich est- pakic thiab resistant rau kua qaub thiab alkali. Cov yeeb yaj kiab no tiv thaiv cov cookware los ntawm kev rov qab noj zaub mov (piv txwv li cov khoom siv acidic xws li tsis muaj cov hlau ua paug (piv txwv li, npib tsib xee) ua kom tsis txhob noj cov zaub mov. Rau lub tshuab ntxhua khaub ncaws puab nruas (ua los ntawm stainless hlau), passivation paste yog siv los kho cov weld seams thiab sab hauv. Tus passivation zaj duab xis tiv thaiv corrosion los ntawm cov xab npum thiab nyuaj, tiv thaiv kev tsim cov xeb thiab kev siv tshuab ntxhua khaub ncaws lub neej. Tsis tas li ntawd, rau cov taub dej stainless hlau, passivation paste yog thov rau sab hauv cov kab mob uas tiv thaiv kev loj hlob ntawm cov kab mis los ntawm kev txhim kho cov xim hlau.
Kev xaiv xaiv rau passivation muab tshuaj txhuam
Tsis yog txhua tus passion cov khoom lag luam yog tsim rau txhua daim ntawv thov. Qhov kev ua tau zoo ntawm passivation paste yog nyob ntawm seb nws puas phim rau hom hlau tshwj xeeb, chaw ib puag ncig, thiab kev ua tau zoo. Xaiv cov cai passionation paste yuav tsum txiav txim siab ntau yam tseem ceeb yam, uas muaj cov ncauj lus kom ntxaws hauv qab no.
Sib txuam passivation muab tshuaj txhuam rau lub hom phiaj hlau
Cov qauv qhia tseem ceeb tshaj plaws rau kev xaiv passivation paste yog txuam nrog cov hlau uas yuav tsum tau kho. Cov tshuaj sib txawv muaj cov tshuaj sib txawv, yog li lawv xav tau cov kab passivators uas tuaj yeem tsim cov yeeb yaj kiab ruaj khov ntawm lawv cov chaw. Siv kev ua txhaum cai hla dhau los tuaj yeem ua rau muaj txiaj ntsig zoo zaj duab xis, lossis txawm tias puas rau cov hlau.
Stainless hlau: Stainless hlau muaj chromium (feem ntau yog 10. 500% lossis ntau dua), uas yog qhov tseem ceeb ntawm kev sib sau ua yeeb yaj kiab passivation. Hla kev muab tshuaj txhuam rau cov hlau stainless feem ntau siv nitric acid, citric acid, lossis lawv cov ntsev, lossis lawv cov ntsev raws li cov neeg passivators. Nitric acid -}}}}}}}}}} omos acidic thiab yuav tsum tau ua tib zoo saib. CITIC acid -} Cov tshuaj txhuam tsis yog {}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
Aluminium thiab Aluminium Alloys: Txhuas cov ntaub ntawv lub ntuj tsoxide, tab sis zaj duab xis no nyias thiab muaj kev tiv thaiv kev txwv. Passivation muab tshuaj txhuam rau txhuas feem ntau siv phosphoric acid, chromic acid, lossis zirconium tebchaw. Phosphoric acid - Cov tshuaj txhuam yog tsim nyog rau kev ntsuas kom zoo (piv txwv li cov khoom siv.
Tooj liab thiab tooj liab alloys: Tooj liab muaj zog rau oxidation thiab tarnishing. Passivation muab tshuaj txhuam rau tooj liab siv benzotriazole (BTA) lossis nws cov derivatives raws li passivators. BTA {- Cov ntaub ntawv muab tshuaj txhuam cov khoom lag luam, piv txwv li, cov hniav nyiaj hniav kub, cov tshuab hluav taws xob) thiab hluav taws xob.
Titanium thiab titanium alloys: Titanium xav tau passivation rau cov chaw hnyav. Passivation muab tshuaj txhuam rau titanium siv oxalic acid (dog} {{1} {{1} {{1} {} {{{{5 {5 5 {{5} { - 50 Qib rau 500 Degree -Ror Aerospace Cav Qhov).
Txiav txim siab cov ntawv thov ib puag ncig ntawm passivation muab tshuaj txhuam
Txheej txheem ib puag ncig sau ua ke passivation zaj duab xis, yog li nws yog qhov tseem ceeb rau kev xaiv passivation.
High - av noo / marine: Chloride ions ua rau corrosion. Stainless hlau siv Molybdate {{modified nitricdenum {{chromium zaj duab xis cov yeeb yaj kiab chloride); Aluminium siv Zirconium muab tshuaj txhuam (ua kom cov pa oxide thaiv kom thaiv chloride).
Siab - kub: Ntau tshaj 300℃ua rau cov yeeb yaj kiab zoo tib yam. Stainless hlau siv chromic acid muab zaj duab no - rau cov chaw ua kom sov); Titanium hniav siv cov oxalic acid tawm (crystalline zaj duab xis tiv thaiv thermal nrib pleb).
Tshuaj Yeeb Nkab: Rau cov sulfuric acid - Cia stain stainless hlau, siv oxide {1} olide olide, cov ntawv dense chromium zaj duab xis); Tooj liab Pipelines Siv BTA - silicone paste (hydrophobic txheej tiv thaiv los ntawm cov kuab tshuaj).
Khoom Noj / Kev Kho Mob: Tsis - ua si, tsis muaj seem. Khoom Noj Khoom Noj -}} qib qhab-stainless hlau siv fda-}}}}}}}citric acidMuab tshuaj txhuam; Kev kho mob titanium kev tiv thaiv siv hydrogen peroxide paste (biocompible, bactericidal).
Raws li cov neeg hla kev hla nrog kev ua tau zoo
Cov khoom ua haujlwm sib xyaw ua haujlwm xav tau (tuab, tsos, kev ua haujlwm) qhia passivation xaiv.
Admin tuab: Cov yeeb yaj kiab nyias (5 - 10 n} {- tooj liab pcb txuas) sib npaug bypeb sib txuas; Tuab Films (20 {5 5}}}}}|50-confectration Nitrical Steel Offe Pipelines) Boost Croas) Boost Croason Boost Diste.
Kev tshwm sim: Hniav qhov chaw xav tau cov yeeb yaj kiab pob tshab. Tooj liab hniav nyiaj hniav kub siv BTA - glycerin muab tshuaj txhuam (khaws lus); Stainless hlau dab siv citric acid muab tshuaj txhuam (tsis muaj yellowing).
Kev coj ua: Cov khoom hluav taws xob feem xav tau qis - Tsis muaj cov yeeb yaj kiab. Tooj liab cov chaw siv qis - molecular {{l}} phaus bta muab tshuaj txhuam; Aluminium windings Siv phosphoric acid -} cov pa roj carbon dub (ua haujlwm network).
Them nyiaj rau ib puag ncig thiab kev nyab xeeb qauv rau passivation muab tshuaj txhuam
Cov Kev Cai Thoob Ntiaj Teb (ncav cuag, EPA) Thov eco - Tus phooj ywg, muaj kev nyab xeeb passivation.
Kev Txwv Kom Muaj Mob: Cov khoom tsuag niaj hnub no kom tsis txhob muaj hexavalent chromium. Aluminium Zirconium muab tshuaj txhuam ntsib mus txog SVHC qauv (tsis muaj Chromate / Cov hlau hnyav).
VOC emissions: Dej {- Raws li muab tshuaj txhuam (VOC<50 g/L, e.g., food-grade citric acid paste) replaces solvent-based to reduce air pollution.
Kev Nyab Xeeb Siv: Tsawg {- acid / neutral paste (piv txwv li zirconium paste p 5-6) muaj kev nyab xeeb dua li muaj kua qaub (Ph<1) which needs protective gear.
Daim ntawv thov cov txheej txheem ntawm passivation muab tshuaj txhuam
Yog daim ntawv thov kom paub zoo zaj duab xis zoo; Cov kauj ruam suav nrog ua ntej ua ntej - kev kho, thov, kho, post {1} {1} {1} {1} {1} {
Pre6 - kev kho mob: npaj cov hlau nto rau passivation paste
Tshem cov paug rau muab tshuaj txhuam -} substrate tiv thaiv:
Ncab: Alkaline daws (stainless hlau) lossis ethanol (precision tooj liab) tshem cov roj.
Derusting: Cov kua qaub tsis muaj zog (lub teeb xeb) lossis cov acid (muaj xeb hnyav) pickles; Lub sijhawm tswj (5 -} 20 mins) kom tsis txhob dhau-etching.
Yaug / ziab: Cov dej tso tawm yaug yaug + cov cua kub kom qhuav (50 {}} 80 prev degree)) tiv thaiv kev ua ntej / kev cuam tshuam dej noo.
Daim Ntawv Thov: Thov Passivation Passivation rau cov hlau saum npoo
Txoj kev nyob ntawm cov duab sib xyaw / qhov loj me:
Kev txhuam hniav: 0.5 {-}} 2 mm txheej rau cov chaw loj / Welds (npog cov chaw kub-cuam tshuam rau cov aav).
Txau: 0.3 {{-}}}}}}}}}}}}}}}}}}}}}}}}}}} wb ntawm cov duab siab siab (cov txheej txheem sib xyaw, ntau txheej nyias nyias kom tsis txhob tawg).
Ntsw: 5-15 mins rau me me batches; Ntws dhau los tswj tuab.
Kev Kho: Tswj cov tshuaj tiv thaiv lub sijhawm thiab qhov kub ntawm passivation paste
Kev kho cov xwm txheej nyob ntawm paste / hlau:
Chav - kub: Dej {{-} Raws li muab tshuaj txhuam (20}}}}}}}}, tooj liab 30-60 mins) hauv thaj chaw muaj cua zoo.
Ua kom sov: High {-} kub, 15-60 mins; piv txwv li, titanium tuaj ntawm 120℃rau 30 mins); Majluag cua sov tiv thaiv kev poob siab.
Post - Kev Kho Mob: Tshem Tawm Realidual Passivation Paste thiab tshawb xyuas zaj duab xis
Ntxuav: Dej {-} Raws li muab tshuaj txhuam (40 - 60 Degree Deionized dej yaug); Organic-based (isopropanol so + dej yaug); Qhuav kom tsis txhob muaj dej me ntsis.
Kev kuaj xyuas: View (du, tsis muaj kab nrib pleb); Adhesion (hla - Txiav xeem, tsis muaj tev); Corrosion (24 {{-} 72h txau, tsis muaj xeb); Cov khoom noj-qib-qib (2H 1% citric acid tsau, tsis muaj kev xaus).
Kev tswj kom zoo ntawm passivation daim ntawv thov
QC npog cov peev xwm kev tshuaj xyuas, hauv -} txheej txheem tswj, zaum kawg tshuaj xyuas.
Kev Soj Ntsuam Cov Khoom Siv: Ua kom paub qhov zoo ntawm passivation paste
Txoj kev: Txheeb xyuas cov ntsiab lus nquag (piv txwv li, stainless hlau nitric acid muab 15} 25%, PH 0.5-1.5), dej-raws 500-1500 CP).
Ua yeeb yam: Cov Qauv Ntsuas (piv txwv li, 304 Hlau + Citric Tawv Khaws Khoom: 2Toom Chav Temp Kho + 24 hill tsuag tsuag, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb, tsis muaj xeb Parte kev kho mob xav tau biocompatibility kev ntsuam xyuas.
Chaw ntim khoom: Khij txee lub neej (6-12 hlis) thiab txias / cua txias; muab pov tseg / tsis zoo li.
Hauv - txheej txheem tswj: Kev Tswj Xyuas Cov Ntsiab Lus ntawm Passivation Daim Ntawv Thov
Ua ntej - kev kho: Soj ntsuam lub sijhawm / pickling; Tswj Xyuas PH Degreaser PH 10-12 (hloov<9) and pickling pH 1-2 (replace >2).
Tshuaj Txhuam Daim Ntawv Thov: Taug qab txheej thickness (siv zaj duab xis tuab nyhav taw Rau txau, xaiv phom siab (0.2-0.3 MPa) kom tsis txhob muaj kev pab cuam ncaj; Kev tshem tawm, tswj lub sijhawm nqus dej (5-15 mins) los tiv thaiv kom dhau cov khoom noj muaj zog tshaj.
Kho txheej txheem: Rau cov chav -}}}}} pa taws kub (20-25 degree) thiab av noo (<60%)-high humidity slows reaction. For heated curing, use a temperature controller to keep oven temp within ±5°C of the target (60-150°C) and monitor heating rate (5-10°C/min) to avoid thermal shock. Log curing time (15 mins-4 hours) to ensure full film formation.
Kev kuaj xyuas zaum kawg: ntsuas cov passivated Cheebtsam
Tom qab Post - kev kho, kev soj ntsuam kom ua kom cov neeg ua yeeb yaj kiab passivation ua tau raws li cov qauv:
Zaj duab xis xyuas: 除 Qhov Kev Ntsuam Xyuas Kev Ntsuas (Hla -}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}, ib yam yuav tsum tau). Rau siab - precision qhov chaw (piv txwv li, siv hluav taws xob), siv lub tshuab ntsuas hluav taws xob (SEM) los kuaj xyuas cov kab mob me lossis hws.
Corrosion Resportion: Kev ua ntsev tsuag tshuaj (24 - 72h hauv 5% nacl daws tau; Rau cov tshuaj tiv thaiv kev tiv thaiv, ntxiv cov kev ntsuam xyuas cov hom phiaj (piv txwv li, 24h soak hauv 10% sulfuric acid rau stainless hlau tso tsheb hlau luam). Tsis muaj xeb, pitting, los yog zaj duab xis sib nrauj tau tso cai.
Kev nyob sab nrauv nrhiav tau: Siv Fourier - transform} Tau (Ftir) lossis ion chomatography los xyuas cov tshuaj lom (piv txwv li cov hlau hnyav<10 ppm, residual passivator <50 ppm). For food/medical parts, pass a total organic carbon (TOC) test to ensure no harmful organics remain.
Kev txheeb xyuas kev ua haujlwm: Rau cov khoom siv hluav taws xob (piv txwv li, cov txuas), ntsuas kev ua haujlwm (tiv taus<10⁻⁶ Ω·cm) with a multimeter; for high-temperature parts (e.g., engine blades), conduct a thermal cycle test (-50°C to 500°C, 10 cycles) to confirm film stability.
Yav tom ntej cov ncauj lus ntawm passivation muab tshuaj txhuam
Raws li kev lag luam xav tau rau kev ua tau zoo, eco - kev ua tau zoo, thiab ntse ua tshuaj ntsuab yog hloov zuj zus hauv peb cov lus tseem ceeb:
EMO {- Tus phooj ywg thiab qis {1} {}} cov roj carbon formulations: Kev loj hlob ntawm bio -} Cov hmoov txhuv nplej siab (piv txwv li {{} Pub dawb pastes kom tshem tawm voc emissions nkaus. Tshawb nrhiav ntawm "Green Passivators" (piv txwv li cov nroj tsuag cov tshuaj zoo li cov tshuaj yej polyphenols rau tooj liab) los hloov cov txheej txheem hluavtaws, txo cov hluavtaws ib puag ncig.
High - efficiency thiab multi-}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} kev muab tshuaj txhuam: Kev sib xyaw ua ke ntawm nanomaterials (piv txwv li, tio₂ nanoparticles) los txhim kho zaj duab xis {}}} (los ntawm 2h rau 1h rau 1h rau stainless hlau). Txuas ntxiv ntawm tus kheej - kho cov microcapsules (tau sau nrog passivator) uas tawg paj tawg, kho qhov tsis xws luag, kho qhov tsis xws luag thiab txuas ntxiv rau kev ua neej.
Ntse thiab digital compatibility: Emoped qhov kub / av noo sensors hauv paste rau tiag {{sij hawm saib IOT (Iiot) cov tshuab los kho cov khoom tsis sib xws. Kev loj hlob ntawm "xim {{{2} Hloov cov muab tshuaj tiv thaiv" uas ua kom tsis txaus ntseeg thaum cov yeeb yaj kiab tuab tsis txaus, ua rau muaj kev tswj hwm pom tsis muaj cuab yeej.
Cov nqi tseem ceeb thiab muaj lub luag haujlwm ntawm passivation muab tshuaj txhuam
Passivation paste yog ib qho kev tiv thaiv corrosion tseem ceeblus teb, nrog nws cov nqi rooted hauv kev xaiv cov hlau (sib txuam hlau, ib puag ncig, kev ua tiav), ua ntej- kev kho mob), thiab nruj me ntsis tswj hwm. Raws li nws evolves mus rau - kev ua haujlwm zoo li kev lag luam zoo li kev lag luam, thiab cov khoom siv kho mob zoo nkauj thaum ntsib cov qauv kev ua haujlwm thoob ntiaj teb.