Corrosion yog kev puas tsuaj los yog kev puas tsuaj ntawm cov ntaub ntawv los yog lawv cov khoom los ntawm kev ua ntawm ib puag ncig.Feem ntau corrosion tshwm sim nyob rau hauv atmospheric ib puag ncig, uas muaj corrosive Cheebtsam thiab corrosive yam xws li oxygen, humidity, kub hloov thiab cov pa paug.
ntsev tsuag corrosion yog ib hom kev puas tsuaj feem ntau ntawm atmospheric corrosion.Cov tshuaj ntsev tsuag corrosion nyob rau saum npoo ntawm cov ntaub ntawv hlau yog tshwm sim los ntawm cov chloride ions uas muaj nyob rau hauv cov hlau nto nkag los ntawm oxidation txheej thiab tiv thaiv txheej thiab sab hauv hlau electrochemical cov tshuaj tiv thaiv.Nyob rau tib lub sijhawm, cov tshuaj chloride ion muaj qee qhov dej ntawm lub zog, uas yooj yim rau adsorbed nyob rau hauv cov hlau nto pores thiab cov kab nrib pleb thiab hloov cov pa hauv txheej oxide, yog li hloov cov oxide insoluble rau hauv cov tshuaj chloride soluble thiab passivated. lub xeev nto mus rau hauv ib tug active nto.
Ntsevtshuaj tiv thaiv corrosionxeem yog ib qho kev xeem ib puag ncig uas feem ntau siv cov khoom siv simulated ntsev tsuag ib puag ncig tsim los ntawm cov khoom siv ntsev tsuag tshuaj ntsuam xyuas cov khoom siv los yog cov khoom siv hlau.Nws tau muab faib ua ob hom kev xeem: kev sim tshuaj ib puag ncig ntuj, thiab kev sim ua kom nrawm dua ntsev tsuag ib puag ncig kuaj.
Nyob rau hauv ib qho kev simulation ntsev tsuag ib puag ncig kev sim, cov ntsev tsuag tshuaj ntsuam chamber nrog qee qhov ntim ntawm qhov chaw yog siv, thiab ntsev tsuag ib puag ncig yog tsim los ntawm kev siv cov txuj ci dag hauv nws qhov ntim ntawm qhov chaw, txhawm rau ntsuas qhov ua tau zoo thiab qhov zoo ntawm ntsev tsuag corrosion. tsis kam ntawm cov khoom.
Cov ntsev concentration ntawm chloride nyob rau hauv cov ntsev tsuag ib puag ncig yuav ua tau ob peb zaug los yog kaum ob lub sij hawm cov ntsev tsuag cov ntsiab lus nyob rau hauv lub zoo tib yam tej yam ntuj tso ib puag ncig, yog li ua rau kom tus nqi corrosion thiab zoo heev txo lub sij hawm kom tau txais cov txiaj ntsig.Piv txwv li, nws yuav siv sij hawm ib xyoos los corrode thaum kuaj cov khoom qauv hauv ib puag ncig raug, thaum koj tuaj yeem tau txais cov txiaj ntsig zoo sib xws tsuas yog tom qab 24 teev nyob rau hauv cov khoom siv simulation ntsev tsuag ib puag ncig.
Laboratory simulated ntsev tsuag tuaj yeem muab faib ua plaub pawg.
(1) Qhov nruab nrab ntsev tsuag tshuaj ntsuam (NSS test) yog qhov ntxov tshaj plaws thiab feem ntau dav siv ceev kev kuaj corrosion.Nws siv 5% sodium chloride ntsev dej tov, nrog rau pH tus nqi hloov mus rau qhov nruab nrab (6.5 ~ 7.2) raws li cov tshuaj tsuag.Qhov ntsuas kub yog 35 ℃, thiab qhov yuav tsum tau muaj cov sedimentation ntawm ntsev tsuag yog 1 ~ 2ml / 80cm / h.
(2) Acetic acid ntsev spray test (ASS test) yog tsim los ntawm kev kuaj tshuaj ntsev nruab nrab.Nws yog nyob rau hauv 5% sodium chloride tov nrog ib co glacial acetic acid, thiaj li hais tias cov tshuaj PH nqi txo mus txog 3, cov tshuaj yuav acidic, thiab cov ntsev tsuag tsim thaum kawg ua acidic los ntawm nruab nrab ntsev tsuag.Nws tus nqi corrosion yog kwv yees li 3 npaug sai dua qhov kev sim NSS.
(3) Cov ntsev tooj liab nrawm nrawm acetate spray test (CASS test) yog ib qho tshiab tsim tawm txawv teb chaws ceev ntsev tsuag tshuaj tiv thaiv corrosion.Qhov ntsuas kub yog 50 ℃.Ib qho me me ntawm tooj liab ntsev-tooj liab chloride yog ntxiv rau cov ntsev ntsev kom ua rau muaj kev xeb.Nws tus nqi corrosion yog li ntawm 8 npaug ntawm NSS xeem.
(4) Alternating ntsev tsuag tshuaj ntsuam yog ib qho kev ntsuam xyuas ntsev tsuag, uas yog ib qho kev ntsuam xyuas ntsev nruab nrab ntxiv rau cov av noo tas li thiab ntsuas kub.Nws yog tsuas yog siv rau cov kab noj hniav hom khoom.Los ntawm kev nkag mus ntawm qhov chaw tidal, cov ntsev tsuag tshuaj corrosion yog tsim tsis tsuas yog nyob rau saum npoo ntawm tab sis kuj nyob rau hauv cov khoom.Cov khoom yog hloov pauv ntawm cov tshuaj tsuag ntsev thiab cov av noo thiab tshav kub ib puag ncig, thiab tom qab ntawd cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob yuav tsum raug ntsuas rau txhua qhov kev hloov pauv.
Kev txiav txim siab tshwm sim
Cov txiaj ntsig ntawm kev ntsuas tshuaj ntsev yog feem ntau muab rau hauv daim ntawv zoo es tsis yog daim ntawv ntau.Muaj plaub txoj hauv kev los txiav txim.
(1) Kev ntsuas ntsuas ntsuas.
Nyob rau hauv txoj kev no, faib qhov sib piv ntawm cheeb tsam corrosion thiab tag nrho cheeb tsam mus rau ntau theem, thiab txiav txim siab ib theem raws li qhov tsim nyog rau kev txiav txim.Txoj kev no yog tsim rau kev ntsuam xyuas ntawm cov qauv tiaj tus.
(2) Kev ntsuas qhov hnyav.
Los ntawm kev ntsuas qhov hnyav ntawm cov qauv ua ntej thiab tom qab kev kuaj corrosion, xam qhov hnyav poob vim corrosion, thiab txiav txim qhovtshuaj tiv thaiv corrosionqhov zoo ntawm tus qauv.Txoj kev no yog tshwj xeeb tshaj yog haum rau kev ntsuam xyuas ntawm tej yam hlau corrosion kuj zoo.
(3) Corrosion data statistical analysis method.
Txoj kev no muab cov kev ntseeg siab ntawm kev tsim cov kev ntsuam xyuas corrosion, tshuaj xyuas cov ntaub ntawv corrosion, thiab txiav txim siab cov ntaub ntawv corrosion, uas yog siv rau kev txheeb xyuas thiab txheeb cais ntawm corrosion, tsis yog tshwj xeeb rau kev txiav txim siab ntawm cov khoom zoo.
Ntsev tshuaj ntsuam ntawm stainless hlau
Txij li thaum tsim nyob rau hauv lub xyoo pua nees nkaum, ntsev tsuag tshuaj ntsuam tau zoo heev los ntawm cov neeg siv ntawm corrosion-resistant cov ntaub ntawv vim nws zoo xws li txo lub sij hawm thiab nqi, muaj peev xwm mus kuaj ntau yam ntaub ntawv, thiab muab tau yooj yim thiab meej.
Hauv kev xyaum, kev ntsuas ntsev ntsev ntawm cov hlau tsis muaj hlau yog qhov paub dav tshaj plaws, thiab cov kws kho mob yuav tsum paub txog pes tsawg teev cov tshuaj tsuag ntsev tuaj yeem kav ntev rau cov khoom siv no.
Cov neeg lag luam khoom siv feem ntau yuav txuas ntxiv lub sij hawm tshuaj tsuag ntsev ntawm stainless hlau nrog txoj kev xws li passivation lossis nce qib polishing nto.Txawm li cas los xij, qhov tseem ceeb tshaj plaws kev txiav txim siab yog qhov muaj pes tsawg leeg ntawm stainless hlau nws tus kheej, piv txwv li cov ntsiab lus ntawm chromium, molybdenum thiab npib tsib xee.
Qhov siab dua cov ntsiab lus ntawm ob qho tib si chromium thiab molybdenum, qhov ntau dua qhov corrosion kuj yuav tsum tau rau pitting thiab crevice corrosion pib tshwm.Qhov kev tiv thaiv corrosion no tau qhia los ntawm lub npe hu ua pitting resistance equivalent (PRE) tus nqi: PRE = % Cr + 3.3 x % Mo.
Thaum npib tsib xee tsis ua rau cov hlau tsis muaj zog rau pitting thiab crevice corrosion, nws tuaj yeem ua tau zoo hauv kev ua kom qeeb ntawm corrosion thaum cov txheej txheem corrosion tau pib.Yog li ntawd, austenitic stainless hlau uas muaj npib tsib xee yuav ua tau zoo dua nyob rau hauv kev ntsuam xyuas ntsev tsuag thiab xeb ntau dua li tsawg nickel ferritic stainless hlau nrog zoo pitting kuj sib npaug.
Nws yuav tsum tau muab sau tseg tias ntsevtshuaj tiv thaiv corrosionxeem muaj qhov tsis zoo tseem ceeb thaum kuaj kev ua haujlwm ntawm stainless hlau.Cov ntsiab lus chloride ntawm cov tshuaj tsuag ntsev hauv cov tshuaj tsuag ntsev yog siab heev thiab nyob deb tshaj qhov chaw tiag tiag, yog li cov hlau tsis muaj zog uas tuaj yeem tiv taus corrosion hauv cov ntawv siv tiag tiag nrog cov ntsiab lus chloride tsawg yuav kuj corrode hauv cov tshuaj tsuag ntsev.
Cov tshuaj ntsev ntsev hloov pauv tus cwj pwm corrosion ntawm stainless hlau, uas tuaj yeem suav tias tsis yog kev sim nrawm lossis simulation sim.Cov txiaj ntsig yog ib sab thiab tsis muaj kev sib raug zoo nrog kev ua tau zoo ntawm cov hlau tsis muaj hlau uas thaum kawg muab tso rau hauv kev siv.
Yog li koj tuaj yeem siv cov tshuaj tsuag ntsev los sib piv cov tshuaj tiv thaiv corrosion ntawm ntau hom stainless hlau, tab sis qhov kev sim no tsuas yog muaj peev xwm ntsuas cov khoom siv.Thaum xaiv cov khoom siv stainless hlau tshwj xeeb, kev ntsuas tshuaj ntsev ib leeg feem ntau tsis muab cov ntaub ntawv txaus vim tias kev sib txuas ntawm cov kev sim ntsuas thiab qhov chaw siv tiag tiag tsis tshua paub.
Tsis tas li ntawd, cov khoom sib txawv ntawm cov hlau tsis tuaj yeem muab piv nrog rau ib leeg, vim tias ob qho khoom siv hauv kev sim muaj cov txheej txheem corrosion sib txawv, yog li cov txiaj ntsig kev xeem thiab qhov cuam tshuam ntawm qhov kawg siv ntawm ib puag ncig tsis zoo ib yam.
Lub sij hawm xa tuaj: Plaub Hlis-08-2022