Corrosion yog qhov kev puas tsuaj los yog deterioration ntawm cov ntaub ntawv lossis lawv cov peev xwm tshwm sim los ntawm ib puag ncig. Feem ntau corrosion tshwm sim nyob rau hauv ib puag ncig ib puag ncig ib puag ncig thiab corrosive cov cheeb tsam xws li oxygen xws li oxygen, av noo, kub hloov thiab muaj kuab paug.
Cyclic corrosion yog ib qho tshwm sim thiab feem ntau cov cua nab kuab corrosion. Cyclic corrosion ntawm cov hlau cov ntaub ntawv yog vim cov tshuaj pleev ib sab ntawm cov txheej txheem oxidized thiab cov khoom tiv thaiv hlau hluav taws xob ntawm. Nyob rau tib lub sijhawm, chlorine ions muaj cov txheej txheem kev sib tw, cov kab nrib pleb
Cyclic kev sim yog ib hom kev xeem ib puag ncig tsuas yog siv cov khoom lag luam uas muaj dag ntawm cov khoom lag luam uas ua kom haum rau cov khoom lag luam corrosion los yog cov khoom siv hlau. Nws tau muab faib ua ob pawg, ib qho rau kev kuaj ib puag ncig ib puag ncig, lwm qhov rau kev sim ua kom nrawm nrawm ntawm cyclic corrosion ib puag ncig.
Kev sim ua khoom siv ntawm cyclic corrosion ib puag ncig yog kev siv cov khoom lag luam hauv chaw, ua rau muaj cov khoom lag luam cuav
Nws yog piv nrog lub ntuj ib puag ncig, cov ntsev conctration ntawm nws cov ntsiab lus cyclic tau muaj ntau, yog li ntawd cov khoom siv corrosion, yog li ntawd cov khoom siv collicity Xws li nyob rau hauv ib puag ncig ntuj raug rau ib qho chaw kuaj cov khoom lag luam, kom muaj kev sim siab ntawm cyclic ib puag ncig, ntev li 24 teev, koj tuaj yeem tau txais cov txiaj ntsig zoo sib xws.
Kuaj simulated cyclic corrosion tau muab faib ua plaub pawg
(1)Nruab nrab cyclic kuaj (NSS sim)yog ib qho kev ntsuas corosion nrawm uas tau tshwm sim thaum ntxov thiab tam sim no siv tau ntau. Nws siv 5% ntsev chloride saline kua, daws PIC nqi tau hloov kho nyob rau hauv nruab nrab ntawm cov (6.5 ~ 7.2) raws li kev daws rau txau. Kev sim ntsuas kub yog noj 35 ℃, tus nqi kev sib hais haum ntawm cov cyclic corrosion yuav tsum muaj hauv 1 ~ 2ml / 80cm / h.
(2)Kuaj cov acid cyclic corrosion corrosion (lub nroog yiav)yog tsim los ntawm lub hauv paus ntawm nruab nrab cyclic kuaj. Nws yog kom ntxiv qee cov acetic acetic acid nyob rau hauv 5% sodium vloride tov, yog li ntawd lub ntsuas pyclic tau hloov los ntawm nruab nrab cyclic colrosion rau acidic. Nws tus nqi corrosion yog li 3 zaug sai dua nss kuaj.
(3)Tooj liab ntsev kom nrawm nrawm actic acid cyclic ntsuas (kuaj ntshav)Yog ib qho kev sim tshiab sai sai Cyclicion Codicion, qhov ntsuas kub ntawm 50 ℃, ntsev tov ntsev - tooj liab chloride, muaj zog inducions corrosion. Nws tus nqi corrosion yog kwv yees li 8 zaug ntawm NSS TEST.
(4)Hloov kev ntsuas cyclic corrosionyog ib qho kev ntsuas cyclicense cyclicion, uas yog qhov tseeb meanterral codrosion corrosion ntxiv ntxiv rau tag nrho cov av noo thiab kev kuaj kub. Nws yog tsuas yog siv rau kab noj hniav, yog li ntawd cov kev nkag mus rau ntawm cov khoom siv noo noo tsis yog tsim nyob rau saum npoo ntawm cov khoom, tab sis kuj sab hauv cov khoom. Nws yog cov khoom lag luam hauv cyclic corrosion thiab vaum huab cua tshav kub hloov, thiab thaum kawg ntsuas cov hluav taws xob thiab cov khoom siv nrog lossis tsis hloov pauv.
Qhov kev ntsuas cov qhabnias los ntawm kev kuaj cyclic corrosion feem ntau muab rau hauv cov txiaj ntsig zoo dua li cov ntawv ntau. Muaj plaub qhov kev txiav txim siab tshwj xeeb.
①Kev ntsuam xyuas txoj kev txiav txim siabyog thaj chaw corrosion thiab tag nrho thaj tsam ntawm qhov sib piv ntawm feem pua raws li ib qho kev sib cais ntawm cov kev txiav txim siab tsim nyog, nws yog qhov tsim nyog rau cov qauv tiaj rau kev ntsuam xyuas.
②Nyhav kev txiav txim siabYog los ntawm qhov hnyav ntawm cov qauv kev sim ua ntej thiab tom qab kev txiav txim siab ntawm corrosion, nws yog tshwj xeeb rau kev ntsuas cov hlau ua kom zoo.
③Corrosive tsos txiav txim txoj kevyog ib txoj kev txiav txim siab tsim nyog, nws yog cyclic corrosion corrosion, seb cov khoom lag luam tsim cov qauv, cov qauv khoom lag luam dav dav tau siv hauv hom no.
④Corrosion cov ntaub ntawv txheeb xyuas cov txuj ci tshawb xyuasMuab cov qauv tsim ntawm cov ntaub ntawv kev ntsuam xyuas corrosion, tshuaj xyuas cov ntaub ntawv ntawm cov txheej txheem, uas yog feem ntau corrosion, tsis yog tshwj xeeb rau kev txiav txim siab tshwj xeeb.
Cyclic Corrosion Ntsuas Cov Hlau Stainless
Cyclic Chantion Chantion tau tsim nyob rau hauv thaum ntxov thib nees nkaum xyoo, yog qhov ntev tshaj plaws ntawm "corrosion-resistant cov ntaub ntawv siv, tau dhau los ua" kev xeem rau Universal ". Cov laj thawj tseem ceeb muaj raws li nram no: ① sijhawm txuag; Tus nqi qis tsawg; Perman tuaj yeem kuaj ntau cov ntaub ntawv; ④ Cov txiaj ntsig yog qhov yooj yim thiab meej, haum rau kev sib hais haum ntawm kev ua lag luam tsis sib haum.
Hauv kev coj ua, lub cyclic corrosion ntsuas ntawm stainless hlau yog qhov feem ntau paub paub - pes tsawg teev tuaj yeem ua li cas cov khoom siv cyclic? Cov kws kho mob yuav tsum tsis muaj neeg txawv rau lo lus nug no.
Cov khoom siv cov khoom siv feem ntau sivpassivationkev kho mob lossisTxhim kho cov txheej txheem saum npoo, thiab lwm yam., txhawm rau txhim kho lub sij hawm cyclic corrosion ntawm stainless hlau. Txawm li cas los xij, qhov tseem ceeb tseem ceeb tshaj plaws txiav txim siab yog cov muaj pes tsawg leeg muaj pes tsawg tus kheej, piv txwv li cov ntsiab lus ntawm chromium, molybdenum thiab npib tsib xee.
Lub siab dua cov ntsiab lus ntawm ob lub ntsiab, chromium thiab molybdenum, qhov muaj zog dua cov corrosion kev ua haujlwm xav tau kom tawm tsam pitting thiab crevice corrosion pib tshwm. Qhov no corrosion tsis kam yog qhia nyob rau hauv cov nqe lus ntawm thiaj li hu uaPisting tiv taus sib npaug(Pre) Tus Nqi: Ua Ntej =% CR + 3.3 x% m mo.
Txawm hais tias npib tsib xee tsis nce kev tawm tsam ntawm cov hlau tsis kam mus pitting thiab crevice corrosion, nws tuaj yeem ua kom qeeb qeeb ntawm txoj kev corrosion tom qab tau pib corrosion tau pib. Nickel-muaj cov roj hlau tsis muaj roj yog li nyiam ua kom zoo sib xws nrog cov kab mob uas tsis muaj pa loj nrog cov kab sib luag
Txuj ci: rau tus qauv 304, nruab nrab Cyclic corrosion feem ntau yog nruab nrab ntawm 48 thiab 72 teev; Rau cov qauv 316, nruab nrab Cyclic corrosion feem ntau yog ntawm 72 thiab 120 teev.
Nws yuav tsum tau sau tseg tiastusCyclic CorrosionKev xeem ntawv muaj cov tsis zoo thaum kuaj cov khoom ntawm cov hlau stainless.Cov chloride cov ntsiab lus ntawm lub cyclic corrosion nyob rau hauv lub cyclic corrosion yog qhov tseem ceeb heev, yog li cov corrodide cov ntsiab lus tiag tiag nrog cov corroded nyob rau hauv lub cyclic corrosion.
Cyclic kev sim hloov cov cwj pwm uas xeb ntawm cov hlau stainless, nws tuaj yeem tsis tau pom tias yog kev sim nrawm tsis yog kev sim sim ua kom nrawm dua. Cov txiaj ntsig yog ib sab thiab tsis muaj kev sib raug zoo sib npaug nrog kev ua tau zoo ntawm cov hlau stainless uas yog thaum kawg muab tso rau hauv kev siv.
Yog li peb tuaj yeem siv lub cyclic corrosion corrosion los sib piv cov corrosion tsis kam ntawm ntau hom stainless hlau, tab sis qhov kev xeem no tsuas yog muaj peev xwm ntsuas cov khoom. Thaum xaiv cov khoom siv stainless hlau tshwj xeeb yog ib leeg xwb yog peb tsis nkag siab zoo, vim peb tsis muaj kev nkag siab txaus ntawm qhov kev xeem thiab cov ntawv thov tiag tiag.
Rau tib qho laj thawj, nws tsis tuaj yeem kwv yees lub neej ntawm cov khoom raws nkaus nkaus xwb nyob rau ntawm lub voj colcasion corrosion ntawm cov qauv hlau stainless.
Ib qho ntxiv, nws tsis tuaj yeem ua qhov sib piv ntawm ntau hom hlau, peb tsis tuaj yeem sib piv cov khoom siv sib txuas thiab cov khoom sib txheeb ntawm cov khoom yuav xaus siv tsis zoo ib yam.
Lub sijhawm Post: NOV-06-2023