Corrosion yog kev puas tsuaj lossis kev puas tsuaj ntawm cov khoom lossis lawv cov khoom los 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, av noo, kub hloov thiab pa phem.
Cyclic Corrosion yog ib qho tshwm sim thiab feem ntau puas atmospheric corrosion.Cyclic Corrosion corrosion nyob rau saum npoo ntawm cov ntaub ntawv hlau yog vim cov chloride ions uas muaj nyob rau hauv cov hlau nto ntawm oxidized txheej thiab cov txheej tiv thaiv ntawm cov hlau nto nkag mus rau hauv cov hlau electrochemical cov tshuaj tiv thaiv los ntawm.Nyob rau tib lub sijhawm, chlorine ions muaj qee lub zog hydration, yooj yim rau adsorbed nyob rau hauv qhov pores ntawm cov hlau nto, cov kab nrib pleb thiab hloov cov pa hauv oxide txheej, insoluble oxides rau hauv soluble chlorides, thiaj li passivation ntawm lub xeev. lub nto mus rau hauv ib tug active nto.
Cyclic Corrosion test yog ib hom kev ntsuas ib puag ncig feem ntau yog siv Cyclic Corrosion xeem cov cuab yeej los tsim kev simulation ntawm Cyclic Corrosion ib puag ncig los ntsuas qhov corrosion kuj ntawm cov khoom lossis cov ntaub ntawv hlau.Nws tau muab faib ua ob pawg, ib qho rau kev kuaj ib puag ncig ntuj, thiab lwm yam rau kev simulation nrawm nrawm ntawm Cyclic Corrosion ib puag ncig kuaj.
Artificial simulation ntawm Cyclic Corrosion ib puag ncig kev sim yog siv qee qhov ntim ntawm qhov chaw kuaj cov cuab yeej - Cyclic Corrosion test chamber (Daim duab), hauv nws qhov ntim ntawm qhov chaw nrog cov txuj ci dag, ua rau Cyclic Corrosion ib puag ncig los ntsuas qhov zoo ntawm cov khoom Cyclic Corrosion tsis kam.
Nws yog muab piv nrog rau tej yam ntuj tso ib puag ncig, ntsev concentration ntawm chloride ntawm nws Cyclic Corrosion ib puag ncig, yuav ua tau ob peb zaug los yog kaum ob lub sij hawm ntawm tej yam ntuj tso ib puag ncig Cyclic Corrosion cov ntsiab lus, yog li ntawd tus nqi corrosion yog heev nce, Cyclic Corrosion xeem ntawm lub khoom, lub sij hawm kom tau txais cov txiaj ntsig kuj tseem luv heev.Xws li nyob rau hauv ib puag ncig raug cuam tshuam rau cov khoom qauv kuaj, los ua nws cov corrosion kuj yuav siv sij hawm 1 xyoo, thaum nyob rau hauv cov khoom siv simulation ntawm Cyclic Corrosion ib puag ncig, ntev li 24 teev, koj tuaj yeem tau txais cov txiaj ntsig zoo sib xws.
Laboratory simulated Cyclic Corrosion tuaj yeem muab faib ua plaub pawg
(1)Neutral Cyclic Corrosion Test (NSS test)yog ib txoj kev ntsuas kev nrawm nrawm uas tau tshwm sim ntxov tshaj plaws thiab tam sim no yog siv dav tshaj plaws.Nws siv 5% sodium chloride saline tov, tov PH nqi kho nyob rau hauv nruab nrab ntau yam (6.5 ~ 7.2) raws li ib tug tov rau tshuaj tsuag.Qhov ntsuas kub yog coj 35 ℃, qhov kev sib haum xeeb ntawm Cyclic Corrosion yuav tsum nyob rau hauv 1 ~ 2ml / 80cm / h.
(2)Acetic acid Cyclic Corrosion test (ASS test)yog tsim los ntawm lub hauv paus ntawm nruab nrab Cyclic Corrosion test.Nws yog ntxiv ib co glacial acetic acid nyob rau hauv 5% sodium chloride tov, thiaj li hais tias PH nqi ntawm cov tshuaj txo mus txog 3, cov tshuaj yuav acidic, thiab qhov kawg tsim ntawm Cyclic Corrosion kuj hloov los ntawm nruab nrab Cyclic Corrosion rau acidic. .Nws tus nqi corrosion yog li 3 zaug sai dua NSS xeem.
(3)Copper ntsev accelerated acetic acid Cyclic Corrosion test (CASS test)yog ib qho tshiab tsim tawm txawv teb chaws ceev ceev Cyclic Corrosion test, qhov ntsuas kub ntawm 50 ℃, ntsev tov nrog ib tug me me ntawm tooj liab ntsev - tooj liab chloride, muaj zog induced corrosion.Nws tus nqi corrosion yog li ntawm 8 npaug ntawm NSS xeem.
(4)Alternating Cyclic Corrosion testyog ib qho kev xeem Cyclic Corrosion test, uas yog qhov nruab nrab Cyclic Corrosion test ntxiv rau cov av noo tas li thiab ntsuas kub.Nws yog tsuas yog siv rau cov kab noj hniav-hom tag nrho cov khoom, los ntawm kev nkag mus ntawm cov av noo ib puag ncig, kom lub Cyclic Corrosion tsis yog tsuas yog generated nyob rau saum npoo ntawm cov khoom, tab sis kuj nyob rau hauv cov khoom.Nws yog cov khoom lag luam nyob rau hauv Cyclic Corrosion thiab ntub dej kub ob qho tib si ib puag ncig, thiab thaum kawg ntsuam xyuas cov khoom siv hluav taws xob thiab cov khoom siv tag nrho nrog lossis tsis muaj kev hloov pauv.
Cov txiaj ntsig ntawm kev kuaj Cyclic Corrosion feem ntau yog muab rau hauv qhov zoo dua li daim ntawv ntau.Muaj plaub txoj kev txiav txim tshwj xeeb.
①ntsuas ntsuas txoj kev txiav tximyog qhov chaw corrosion thiab tag nrho cheeb tsam ntawm qhov sib piv ntawm qhov feem pua raws li ib qho kev faib ua ntau theem, mus rau ib theem raws li kev txiav txim siab tsim nyog, nws tsim nyog rau cov qauv tiaj tus rau kev ntsuam xyuas.
②ntsuas kev txiav txim txoj kevyog los ntawm qhov hnyav ntawm tus qauv ua ntej thiab tom qab kev ntsuas kev ntsuas corrosion, xam qhov hnyav ntawm qhov poob ntawm corrosion los txiav txim qhov zoo ntawm cov qauv corrosion kuj, nws yog tshwj xeeb tshaj yog haum rau cov hlau corrosion kuj zoo ntsuas.
③corrosive tsos kev txiav txim txoj kevyog ib txoj kev txiav txim siab zoo, nws yog Cyclic Corrosion test, seb cov khoom puas ua corrosion tshwm sim los txiav txim cov qauv, cov qauv khoom siv feem ntau yog siv rau hauv cov qauv no.
④corrosion data statistical analysis txoj kevmuab kev tsim cov kev ntsuam xyuas corrosion, kev tsom xam cov ntaub ntawv corrosion, cov ntaub ntawv corrosion los txiav txim siab txog qib kev ntseeg siab ntawm txoj kev, uas yog siv los txheeb xyuas, txheeb xyuas corrosion, tsis yog tshwj xeeb rau kev txiav txim siab ntawm cov khoom zoo.
Cyclic Corrosion xeem ntawm stainless hlau
Cyclic Corrosion xeem tau tsim nyob rau hauv lub xyoo pua nees nkaum, yog qhov ntev tshaj plaws ntawm kev siv "kev kuaj corrosion", cov ntaub ntawv zoo heev corrosion-resistant cov neeg siv, tau dhau los ua "universal" test.Cov laj thawj tseem ceeb yog raws li hauv qab no: ① txuag lub sijhawm;② tus nqi qis;③ tuaj yeem kuaj ntau yam khoom siv;④ cov txiaj ntsig tau yooj yim thiab meej, muaj txiaj ntsig zoo rau kev daws teeb meem kev lag luam.
Hauv kev xyaum, Cyclic Corrosion test ntawm stainless hlau yog qhov dav tshaj plaws paub - pes tsawg teev cov khoom no Cyclic Corrosion xeem?Cov kws kho mob yuav tsum tsis muaj neeg txawv teb chaws rau lo lus nug no.
Cov neeg muag khoom siv feem ntau sivpassivationkev kho mob los yogtxhim kho qhov chaw polishing qib, thiab lwm yam, txhawm rau txhim kho Cyclic Corrosion xeem lub sij hawm ntawm stainless hlau.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 lub ntsiab lus, chromium thiab molybdenum, lub zog muaj zog corrosion xav tau los tiv thaiv pitting thiab crevice corrosion pib tshwm.Qhov no corrosion kuj yog qhia nyob rau hauv cov nqe lus ntawm lub thiaj li huPitting Resistance sib npaug(PRE) tus nqi: PRE = %Cr + 3.3 x %Mo.
Txawm hais tias npib tsib xee tsis ua rau cov hlau tsis muaj zog rau pitting thiab crevice corrosion, nws tuaj yeem ua rau qeeb tus nqi corrosion tom qab cov txheej txheem corrosion tau pib.Nickel-muaj austenitic stainless hlau yog li ntawd yuav ua tau zoo dua nyob rau hauv Cyclic Corrosion tests, thiab corrode npaum li cas tsawg heev dua li tsawg-nickel ferritic stainless hlau uas zoo sib xws rau pitting corrosion equivalents.
Trivia: Rau tus qauv 304, nruab nrab Cyclic Corrosion feem ntau yog nyob nruab nrab ntawm 48 thiab 72 teev;rau tus qauv 316, nruab nrab Cyclic Corrosion feem ntau yog nyob nruab nrab ntawm 72 thiab 120 teev.
Nws yuav tsum tau muab sau tseg tiastusCyclic Corrosionxeem muaj qhov tsis zoo loj thaum kuaj cov khoom ntawm stainless hlau.Cov ntsiab lus chloride ntawm Cyclic Corrosion nyob rau hauv Cyclic Corrosion test yog siab heev, deb tshaj qhov tiag ib puag ncig, yog li cov hlau stainless uas muaj peev xwm tiv taus corrosion nyob rau hauv daim ntawv thov tiag tiag ib puag ncig nrog cov ntsiab lus chloride tsawg heev yuav corroded hauv Cyclic Corrosion test. .
Cyclic Corrosion test hloov tus cwj pwm corrosion ntawm stainless hlau, nws tsis tuaj yeem suav tias yog kev sim nrawm lossis simulation simulation.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 peb tuaj yeem siv Cyclic Corrosion test los sib piv cov corrosion kuj ntawm ntau hom stainless hlau, tab sis qhov kev ntsuam xyuas no tsuas yog ntsuas cov khoom siv.Thaum xaiv cov ntaub ntawv stainless hlau tshwj xeeb, Cyclic Corrosion test ib leeg tsis feem ntau muab cov ntaub ntawv txaus, vim tias peb tsis muaj kev nkag siab txaus ntawm kev sib txuas ntawm cov kev sim ntsuas thiab qhov chaw siv tiag tiag.
Rau tib lub laj thawj, nws tsis tuaj yeem kwv yees lub neej kev pabcuam ntawm cov khoom lag luam raws li kev kuaj Cyclic Corrosion ntawm cov qauv stainless hlau.
Tsis tas li ntawd, nws tsis tuaj yeem ua qhov sib piv ntawm cov hlau sib txawv, piv txwv li, peb tsis tuaj yeem sib piv cov hlau tsis muaj steel nrog coated carbon steel, vim hais tias cov txheej txheem corrosion ntawm ob cov ntaub ntawv siv hauv kev xeem yog qhov sib txawv heev, thiab kev sib raug zoo ntawm cov khoom siv sib txawv. xeem cov qhabnias thiab qhov tseeb ib puag ncig nyob rau hauv uas cov khoom yuav xaus rau kev siv tsis zoo ib yam.
Post lub sij hawm: Nov-06-2023