Kev xeb yog kev puas tsuaj lossis kev puas tsuaj ntawm cov khoom lossis lawv cov khoom uas tshwm sim los ntawm ib puag ncig. Feem ntau kev xeb tshwm sim hauv cov huab cua, uas muaj cov khoom xeb thiab cov yam ntxwv xeb xws li oxygen, av noo, kev hloov pauv kub thiab cov pa phem.
Kev xeb cyclic yog ib qho xeb uas tshwm sim ntau thiab ua rau puas tsuaj ntau tshaj plaws hauv huab cua. Kev xeb cyclic ntawm qhov chaw ntawm cov khoom siv hlau yog vim muaj cov chloride ions uas muaj nyob rau hauv cov hlau nto ntawm cov txheej oxidized thiab cov txheej tiv thaiv ntawm cov hlau nto thiab cov tshuaj tiv thaiv sab hauv ntawm cov hlau. Tib lub sijhawm, cov chlorine ions muaj qee lub zog hydration, yooj yim rau adsorbed hauv cov qhov hws ntawm cov hlau nto, cov kab nrib pleb thiab hloov cov pa oxygen hauv cov txheej oxide, cov oxides tsis yaj tau hloov mus ua cov chlorides yaj tau, yog li ntawd qhov xwm txheej ntawm qhov chaw mus rau hauv qhov chaw nquag.
Kev kuaj Cyclic Corrosion yog ib hom kev kuaj ib puag ncig uas siv cov khoom siv kuaj Cyclic Corrosion los tsim kev sim ua kom pom tseeb ntawm Cyclic Corrosion ib puag ncig los ntsuas qhov kev tiv thaiv corrosion ntawm cov khoom lossis cov ntaub ntawv hlau. Nws muab faib ua ob pawg, ib qho rau kev kuaj kev raug tshuaj lom neeg ib puag ncig, qhov thib ob rau kev sim ua kom nrawm ntawm Cyclic Corrosion ib puag ncig.
Kev sim ua kom pom tseeb ntawm Cyclic Corrosion ib puag ncig kev sim yog kev siv qee qhov ntim ntawm cov khoom siv sim qhov chaw - Cyclic Corrosion test chamber (Daim Duab), hauv nws qhov ntim ntawm qhov chaw nrog cov txheej txheem dag, ua rau muaj Cyclic Corrosion ib puag ncig los ntsuas qhov zoo ntawm cov khoom Cyclic Corrosion corrosion resistance.
Piv rau qhov chaw ib puag ncig ntuj, qhov ntsev concentration ntawm chloride ntawm nws qhov chaw Cyclic Corrosion, tuaj yeem yog ntau zaus lossis ntau zaus ntawm qhov chaw ib puag ncig Cyclic Corrosion cov ntsiab lus, yog li ntawd qhov corrosion tus nqi nce siab heev, Cyclic Corrosion xeem ntawm cov khoom, lub sijhawm kom tau txais cov txiaj ntsig kuj luv dua. Xws li nyob rau hauv qhov chaw ib puag ncig ntuj rau kev kuaj cov khoom qauv, nws qhov corrosion yuav siv sijhawm 1 xyoos, thaum nyob rau hauv kev sim ua dag ntawm Cyclic Corrosion ib puag ncig tej yam kev mob, ntev li 24 teev, koj tuaj yeem tau txais cov txiaj ntsig zoo sib xws.
Kev kuaj simulated Cyclic Corrosion muaj peev xwm muab faib ua plaub pawg
(1)Kev Ntsuas Kev Sib Tw Tsis Muaj Kev Sib Kis (NSS xeem)yog ib txoj kev kuaj xeb ceev uas tau tshwm sim thaum ntxov thiab tam sim no yog qhov siv dav tshaj plaws. Nws siv 5% sodium chloride saline kua, cov tshuaj PH tus nqi kho hauv qhov nruab nrab (6.5 ~ 7.2) ua cov tshuaj tsuag. Qhov kub ntawm kev sim yog 35 ℃, qhov nrawm ntawm Cyclic Corrosion xav tau hauv 1 ~ 2ml / 80cm / h.
(2)Kev kuaj xeb ntawm acetic acid (ASS)yog tsim los ntawm kev sim Cyclic Corrosion nruab nrab. Nws yog ntxiv qee cov kua qaub glacial acetic acid hauv 5% sodium chloride kua, kom tus nqi PH ntawm cov tshuaj txo qis mus txog li 3, cov tshuaj ua kua qaub, thiab qhov kawg ntawm Cyclic Corrosion kuj hloov pauv los ntawm Cyclic Corrosion nruab nrab mus rau acidic. Nws tus nqi xeb yog li 3 zaug sai dua li NSS xeem.
(3)Kev sim tshuaj ntsuam xyuas Cyclic Corrosion ntawm cov ntsev tooj liab (CASS test)yog qhov kev sim tshiab tsim tawm txawv teb chaws sai Cyclic Corrosion, qhov kub ntawm kev sim ntawm 50 ℃, cov tshuaj ntsev nrog me me ntawm cov ntsev tooj liab - tooj liab chloride, ua rau muaj kev xeb ntau heev. Nws qhov kev xeb yog li 8 npaug ntawm qhov kev sim NSS.
(4)Kev sim tshuaj tiv thaiv corrosion cyclicyog kev sim Cyclic Corrosion tag nrho, uas yog qhov tseeb Cyclic Corrosion test nruab nrab ntxiv rau qhov ntsuas av noo tas li thiab cua sov tas li. Nws feem ntau yog siv rau cov khoom lag luam tag nrho, los ntawm kev nkag mus rau hauv qhov chaw noo noo, yog li Cyclic Corrosion tsis yog tsuas yog tsim rau ntawm qhov chaw ntawm cov khoom, tab sis kuj nyob hauv cov khoom. Nws yog cov khoom hauv Cyclic Corrosion thiab cua sov noo ob qho chaw ib puag ncig hloov pauv, thiab thaum kawg ntsuas cov khoom siv hluav taws xob thiab tshuab ntawm tag nrho cov khoom nrog lossis tsis muaj kev hloov pauv.
Cov txiaj ntsig ntawm kev sim Cyclic Corrosion feem ntau yog muab los ntawm daim ntawv zoo dua li ntau. Muaj plaub txoj kev txiav txim siab tshwj xeeb.
①txoj kev txiav txim siab txog kev ntsuasyog thaj chaw xeb thiab tag nrho thaj chaw ntawm qhov sib piv ntawm feem pua raws li ib txoj kev faib ua ntau theem, mus rau ib qib raws li kev txiav txim siab tsim nyog, nws yog qhov tsim nyog rau cov qauv tiaj tus rau kev ntsuam xyuas.
②txoj kev txiav txim siab hnyavyog los ntawm qhov hnyav ntawm cov qauv ua ntej thiab tom qab qhov kev ntsuas qhov corrosion, xam qhov hnyav ntawm qhov poob ntawm corrosion los txiav txim qhov zoo ntawm cov qauv corrosion tsis kam, nws yog qhov tshwj xeeb tshaj yog rau kev ntsuam xyuas qhov zoo ntawm cov hlau corrosion tsis kam.
③txoj kev txiav txim siab qhov tsos ntawm corrosiveyog ib txoj kev txiav txim siab zoo, nws yog Cyclic Corrosion test, seb cov khoom tsim cov xwm txheej corrosion los txiav txim siab cov qauv, cov qauv khoom dav dav feem ntau siv rau hauv txoj kev no.
④Txoj kev tshuaj xyuas cov ntaub ntawv xebmuab kev tsim qauv ntawm kev ntsuam xyuas xeb, kev tshuaj xyuas cov ntaub ntawv xeb, cov ntaub ntawv xeb los txiav txim siab qib kev ntseeg siab ntawm txoj kev, uas feem ntau yog siv los tshuaj xyuas, kev xeb suav lej, es tsis yog rau kev txiav txim siab zoo ntawm cov khoom tshwj xeeb.
Kev kuaj xeb ntawm cov hlau tsis xeb
Kev sim tshuaj cyclic corrosion tau tsim nyob rau thaum ntxov xyoo pua nees nkaum, thiab yog qhov siv ntev tshaj plaws ntawm "kev sim tshuaj corrosion", cov khoom siv tiv taus corrosion heev uas cov neeg siv nyiam, thiab tau dhau los ua kev sim "universal". Cov laj thawj tseem ceeb yog raws li nram no: ① txuag sijhawm; ② pheej yig; ③ tuaj yeem sim ntau yam khoom siv; ④ cov txiaj ntsig yooj yim thiab meej, zoo rau kev daws teeb meem kev lag luam.
Hauv kev xyaum, qhov kev sim Cyclic Corrosion ntawm cov hlau tsis xeb yog qhov paub dav tshaj plaws - cov khoom no tuaj yeem sim Cyclic Corrosion tau pes tsawg teev? Cov kws kho mob yuav tsum tsis yog neeg txawv teb chaws rau lo lus nug no.
Cov neeg muag khoom siv feem ntau sivkev ua kom tsis muaj zogkev kho mob lossistxhim kho qib polishing nto, thiab lwm yam, los txhim kho lub sijhawm sim Cyclic Corrosion ntawm cov hlau tsis xeb. Txawm li cas los xij, qhov tseem ceeb tshaj plaws yog cov khoom sib xyaw ntawm cov hlau tsis xeb nws tus kheej, piv txwv li cov ntsiab lus ntawm chromium, molybdenum thiab nickel.
Qhov siab dua ntawm ob lub ntsiab lus, chromium thiab molybdenum, qhov muaj zog dua qhov kev ua tau zoo ntawm kev xeb uas xav tau los tiv thaiv kev xeb pitting thiab crevice pib tshwm sim. Qhov kev tiv thaiv xeb no yog qhia nyob rau hauv cov nqe lus ntawm qhov hu uaPitting Resistance sib npaug(PRE) tus nqi: PRE = %Cr + 3.3 x %Mo.
Txawm hais tias nickel tsis ua rau cov hlau tsis kam rau pitting thiab crevice corrosion, nws tuaj yeem ua rau qeeb qeeb ntawm corrosion tom qab cov txheej txheem corrosion tau pib. Yog li ntawd, cov hlau stainless hlau austenitic uas muaj nickel feem ntau ua tau zoo dua hauv Cyclic Corrosion tests, thiab corrode tsawg dua li cov hlau stainless hlau ferritic uas muaj nickel qis uas muaj kev tiv thaiv zoo sib xws rau pitting corrosion sib npaug.
Cov Lus Qhia Tseem Ceeb: Rau tus qauv 304, qhov nruab nrab Cyclic Corrosion feem ntau yog nruab nrab ntawm 48 thiab 72 teev; rau tus qauv 316, qhov nruab nrab Cyclic Corrosion feem ntau yog nruab nrab ntawm 72 thiab 120 teev.
Yuav tsum tau sau tseg tiaslubKev xeb ib puag ncigkev xeem muaj qhov tsis zoo loj thaum kuaj cov khoom ntawm cov hlau tsis xeb.Cov chloride ntsiab lus ntawm Cyclic Corrosion hauv Cyclic Corrosion xeem yog siab heev, ntau dua li qhov chaw tiag tiag, yog li cov hlau tsis xeb uas tuaj yeem tiv taus xeb hauv qhov chaw siv tiag tiag nrog cov chloride ntsiab lus qis heev kuj yuav raug corroded hauv Cyclic Corrosion xeem.
Kev sim xeb hloov pauv tus cwj pwm xeb ntawm cov hlau tsis xeb, nws tsis tuaj yeem suav tias yog kev sim ua kom nrawm dua lossis kev sim ua piv txwv. Cov txiaj ntsig yog ib sab thiab tsis muaj kev sib raug zoo nrog kev ua tau zoo tiag tiag ntawm cov hlau tsis xeb uas thaum kawg muab tso rau hauv kev siv.
Yog li peb tuaj yeem siv qhov kev xeem Cyclic Corrosion los sib piv qhov kev tiv thaiv corrosion ntawm ntau hom stainless hlau, tab sis qhov kev xeem no tsuas yog tuaj yeem ntsuas cov khoom siv. Thaum xaiv cov khoom siv stainless hlau tshwj xeeb, qhov kev xeem Cyclic Corrosion ib leeg feem ntau tsis muab cov ntaub ntawv txaus, vim peb tsis muaj kev nkag siab txaus txog qhov sib txuas ntawm cov xwm txheej xeem thiab qhov chaw siv tiag tiag.
Vim li no, nws tsis tuaj yeem kwv yees lub neej ua haujlwm ntawm cov khoom raws li kev sim Cyclic Corrosion ntawm cov qauv hlau tsis xeb.
Tsis tas li ntawd xwb, nws tsis yooj yim sua kom muaj kev sib piv ntawm ntau hom hlau sib txawv, piv txwv li, peb tsis tuaj yeem sib piv cov hlau tsis xeb nrog cov hlau carbon coated, vim tias cov txheej txheem xeb ntawm ob yam khoom siv hauv kev xeem sib txawv heev, thiab kev sib raug zoo ntawm cov txiaj ntsig ntawm kev xeem thiab qhov chaw ib puag ncig tiag tiag uas cov khoom yuav siv tsis zoo ib yam.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-06-2023