Feem ntau corrosion ntawm cov ntaub ntawv hlau tshwm sim nyob rau hauv atmospheric ib puag ncig, vim hais tias cov huab cua muaj corrosive Cheebtsam xws li oxygen thiab pa phem, raws li zoo raws li corrosion yam xws li av noo thiab kub hloov. ntsev tsuag corrosion yog ib qho ntawm feem ntau thiab puas atmospheric corrosion.
Txoj cai ntawm ntsev tsuag corrosion
Kev xeb ntawm cov khoom siv hlau los ntawm cov tshuaj tsuag ntsev feem ntau yog tshwm sim los ntawm kev nkag mus ntawm cov tshuaj ntsev ntsev rau hauv cov hlau thiab cov tshuaj tiv thaiv electrochemical, ua rau lub micro roj teeb system ntawm "tsis tshua muaj peev xwm hlau - electrolyte tov - muaj peev xwm impurity". Kev hloov hluav taws xob tshwm sim, thiab cov hlau raws li cov anode dissolves thiab tsim ib qho kev sib xyaw tshiab, uas yog qhov corrosion. chloride ion ua lub luag haujlwm tseem ceeb hauv cov txheej txheem kev puas tsuaj ntawm cov tshuaj ntsev ntsev, uas muaj lub zog nkag tau yooj yim, yooj yim rau kev nkag mus rau cov hlau oxide txheej rau hauv cov hlau, rhuav tshem lub xeev ntawm cov hlau; Nyob rau tib lub sijhawm, chloride ion muaj lub zog me me dej, uas yooj yim rau adsorbed rau saum npoo ntawm cov hlau, hloov cov pa oxygen hauv txheej oxide tiv thaiv cov hlau, kom cov hlau puas.
Ntsev tshuaj tsuag corrosion xeem txoj kev thiab kev faib tawm
Cov tshuaj tsuag ntsev ntsev yog ib qho kev ntsuas kev tiv thaiv kev tiv thaiv kom nrawm rau cov cua tshuab cua. Nws yog ib tug concentration ntawm brine atomized; Tom qab ntawd tshuaj tsuag rau hauv lub thawv kaw thermostatic, los ntawm kev soj ntsuam qhov kev hloov pauv ntawm cov qauv kuaj tau muab tso rau hauv lub thawv rau lub sijhawm kom muaj kev cuam tshuam txog kev tiv thaiv corrosion ntawm cov qauv kuaj, nws yog txoj kev ntsuas nrawm, ntsev concentration ntawm chloride ntsev tsuag ib puag ncig. , tab sis ib puag ncig ntuj ntsev tsuag cov ntsiab lus ob peb zaug los yog kaum ob lub sij hawm, kom tus nqi corrosion kuj zoo heev, ntsev tsuag tshuaj ntsuam xyuas ntawm cov khoom, Lub sij hawm kom tau txais txiaj ntsig kuj tau txo qis heev.
Tshuaj tsuag ntsev ua ntej thiab tom qab
Lub sijhawm corrosion ntawm cov qauv khoom yuav siv sijhawm ib xyoos lossis ntau xyoo thaum kuaj hauv ib puag ncig ntuj, tab sis cov txiaj ntsig zoo sib xws tuaj yeem tau txais nyob rau hauv hnub lossis txawm tias teev thaum kuaj hauv cov khoom siv simulated ntsev tsuag ib puag ncig.
Kev ntsuam xyuas ntsev tsuag yog muab faib ua plaub hom:
① Neutral ntsev tsuag tshuaj ntsuam (NSS)
② Acetic acid spray test (AASS)
③ Copper accelerated acetic acid spray test (CASS)
(4) Alternating ntsev tsuag kuaj
Ntsev tshuaj tsuag cov khoom siv kuaj corrosion
Kev ntsuam xyuas ntawm cov tshuaj ntsev tsuag tshuaj ntsuam xyuas
Cov kev ntsuam xyuas ntawm cov tshuaj tsuag ntsev muaj xws li kev ntsuas ntsuas, kev ntsuas qhov tshwm sim corrosion thiab txoj kev ntsuas.
01
Kev ntsuas ntsuas
Txoj kev ntsuam xyuas faib cov feem pua ntawm cov cheeb tsam corrosion mus rau tag nrho cov cheeb tsam mus rau hauv ob peb qib raws li ib txoj kev, thiab siv ib tug tej qib raws li lub hauv paus rau tsim nyog txiav txim. Txoj kev no yog tsim nyog rau kev ntsuam xyuas ntawm cov pav ca cov qauv. Piv txwv li, GB / T 6461-2002, ISO 10289-2001, ASTM B537-70 (2013), ASTM D1654-2005 txhua tus siv cov qauv no los ntsuas cov tshuaj tsuag ntsev.
Kev tiv thaiv kev ntsuas thiab qhov ntsuas pom
RP thiab RA tus nqi raug xam raws li hauv qab no:
Qhov twg: RP yog tus nqi tiv thaiv; RA yog qhov zoo li qhov ntsuas tus nqi; A yog feem pua ntawm cov corroded ib feem ntawm cov matrix hlau nyob rau hauv tag nrho cheeb tsam thaum RP raug xam; RA yog feem pua ntawm cov corroded ib feem ntawm cov txheej tiv thaiv nyob rau hauv tag nrho cov cheeb tsam.
Overlay classification thiab subjective evaluation
Kev tiv thaiv kev ntsuas tau qhia raws li: RA / -
Piv txwv li, thaum me ntsis xeb tshaj 1% ntawm qhov chaw thiab tsawg dua 2.5% ntawm qhov chaw, nws tau qhia tias: 5 / -
Kev ntsuas qhov tshwm sim yog qhia raws li: - / RA tus nqi + kev soj ntsuam kev kawm + qib tsis ua tiav
Piv txwv li, yog tias qhov chaw thaj tsam ntau dua 20%, nws yog: - / 2mA
Kev ntsuas kev ua tau zoo yog qhia raws li tus nqi RA + kev ntsuam xyuas cov ntsiab lus + qib tsis ua haujlwm overlay
Piv txwv li, yog tias tsis muaj matrix hlau corrosion nyob rau hauv cov qauv, tab sis muaj me ntsis corrosion ntawm anodic npog txheej tsawg tshaj li 1% ntawm tag nrho cov cheeb tsam, nws yog denoted li 10/6sC.
Daim duab ntawm ib qho overlay nrog qhov tsis zoo polarity ntawm cov hlau substrate
02
Txoj kev ntsuas qhov muaj corrodes
Kev ntsuam xyuas corrosion yog ib qho kev txiav txim zoo, nws yog raws li kev ntsuam xyuas ntsev tsuag corrosion, seb cov khoom puas tshwm sim los txiav txim seb tus qauv. Piv txwv li, JB4 159-1999, GJB4.11-1983, GB / T 4288-2003 tau siv txoj kev no los ntsuas qhov ntsuas cov tshuaj ntsev ntsev.
Corrosion yam ntxwv lub rooj ntawm cov khoom siv electroplating tom qab kuaj ntsev tsuag
Kev suav txheej txheem ntawm corrosion tus nqi:
01
Qhov tseem ceeb txheeb ze av noo rau hlau corrosion yog li ntawm 70%. Thaum tus txheeb ze av humidity mus txog los yog tshaj qhov tseem ceeb humidity, cov ntsev yuav delixed los ua ib tug electrolyte nrog zoo conductivity. Thaum tus txheeb ze cov av qis, cov ntsev tov concentration yuav nce mus txog thaum crystalline ntsev yog precipitated, thiab tus nqi corrosion yuav txo raws li. Raws li qhov kub thiab txias, qhov molecular motion intensifies thiab corrosion tus nqi ntawm high ntsev tsuag nce. Lub International Electrotechnical Commission tau taw qhia tias tus nqi corrosion nce los ntawm 2 ~ 3 zaug thiab cov conductivity ntawm electrolyte nce 10 ~ 20% rau txhua txhua 10 ℃ nce hauv qhov kub thiab txias. Rau nruab nrab ntsev tsuag tshuaj ntsuam, nws yog feem ntau txiav txim siab tias 35 ℃ yog qhov tsim nyog kub.02Concentration ntawm kev daws
Qhov kev tso kawm Angle ntawm tus qauv
Cov kev taw qhia sedimentation ntawm cov tshuaj tsuag ntsev yog ze rau ntawm txoj kev ntsug. Thaum cov qauv muab tso rau kab rov tav, nws qhov projection cheeb tsam yog qhov loj tshaj plaws, thiab cov qauv saum npoo dais cov ntsev ntau tshaj plaws, yog li qhov corrosion yog qhov hnyav tshaj plaws. Cov txiaj ntsig tau pom tias thaum lub phaj hlau yog 45 ° los ntawm kab kab rov tav, qhov hnyav poob ntawm ib square meter yog 250g, thiab thaum lub phaj hlau yog sib npaug rau kab ntsug, qhov corrosion poob yog 140g ib square meter. GB / T 2423.17-1993 tus qauv hais tias: "Txoj kev tso cov qauv tiaj tus yuav tsum yog qhov kev sim saum npoo yuav tsum nyob ntawm lub kaum sab xis ntawm 30 ° los ntawm txoj kab ntsug".
04 PH
txo cov pH, qhov siab dua qhov concentration ntawm hydrogen ions hauv cov tshuaj, qhov ntau acidic thiab corrosive. Neutral ntsev tsuag test (NSS) pH tus nqi yog 6.5 ~ 7.2. Vim yog qhov cuam tshuam ntawm ib puag ncig, tus nqi pH ntawm ntsev tov yuav hloov. Txhawm rau txhim kho cov txiaj ntsig ntawm kev ntsuas tshuaj ntsev ntsev, pH tus nqi ntau ntawm cov tshuaj ntsev tau teev nyob rau hauv tus qauv ntawm cov tshuaj ntsev ntsev hauv tsev thiab txawv teb chaws, thiab cov txheej txheem ntawm stabilizing tus nqi pH ntawm ntsev tov thaum lub sij hawm kuaj yog npaj.
05
Tus nqi ntawm ntsev tsuag deposition thiab txau txoj kev
Qhov zoo dua cov ntsev tsuag cov khoom, qhov loj ntawm thaj chaw lawv tsim, cov pa oxygen ntau dua lawv adsorb, thiab lawv cov corrosive ntau dua. Qhov tsis zoo tshaj plaws ntawm txoj kev tshuaj tsuag ib txwm muaj, suav nrog txoj kev tshuaj tsuag pneumatic thiab txoj kev tshuaj tsuag ntauwd, yog qhov tsis zoo ntawm cov tshuaj tsuag ntsev thiab qhov loj ntawm cov ntsev tsuag cov khoom. Cov txheej txheem tshuaj tsuag sib txawv kuj muaj qhov cuam tshuam rau pH ntawm cov tshuaj ntsev.
Cov qauv muaj feem xyuam rau kev kuaj tshuaj ntsev.
Ntev npaum li cas ib teev ntawm ntsev tsuag nyob rau hauv ib puag ncig ntuj?
Cov tshuaj tsuag ntsev tau muab faib ua ob pawg, ib qho yog kev sim tshuaj ib puag ncig ntuj, lwm qhov yog cov khoom siv hluav taws xob nrawm simulated ntsev tsuag ib puag ncig kuaj.
Artificial simulation ntawm ntsev tsuag ib puag ncig kuaj yog siv cov cuab yeej kuaj nrog ib qho chaw ntim - ntsev tsuag tshuaj ntsuam chamber, nyob rau hauv nws ntim qhov chaw nrog cov txuj ci dag los tsim ntsev tsuag ib puag ncig los ntsuas qhov corrosion kuj ntawm cov khoom. Piv nrog rau tej yam ntuj tso ib puag ncig, ntsev concentration ntawm chloride nyob rau hauv lub ntsev tsuag ib puag ncig yuav ua tau ob peb zaug los yog kaum ob lub sij hawm ntawm cov ntsev tsuag cov ntsiab lus nyob rau hauv lub ntuj tej yam kev mob, yog li ntawd lub corrosion ceev yog heev txhim khu kev qha, thiab cov ntsev tsuag tshuaj ntsuam. cov khoom yog luv heev. Piv txwv li, nws yuav siv sij hawm 1 xyoo rau cov qauv ntawm cov khoom yuav corroded nyob rau hauv tej yam ntuj tso raug, thaum zoo xws li cov txiaj ntsig tuaj yeem tau txais hauv 24 teev nyob rau hauv cov khoom siv simulated ntsev tsuag ib puag ncig.
Artificial simulated ntsev tsuag kuaj muaj xws li nruab nrab ntsev tsuag tshuaj ntsuam, acetate spray test, tooj liab ntsev accelerated acetate spray test, alternating ntsev tsuag tshuaj ntsuam.
(1) Neutral ntsev tsuag tshuaj ntsuam (NSS test) yog ib qho kev ntsuam xyuas corrosion nrawm nrog qhov tshwm sim ntxov tshaj plaws thiab daim ntawv thov dav tshaj plaws. Nws siv 5% sodium chloride brine tov, cov tshuaj pH kho nyob rau hauv nruab nrab ntau yam (6 ~ 7) raws li cov tshuaj tsuag. Qhov ntsuas kub tau teem rau ntawm 35 ℃, thiab qhov kev daws teeb meem ntawm cov ntsev tsuag yuav tsum nyob nruab nrab ntawm 1 ~ 2ml / 80cm².h.
(2) acetate spray test (ASS test) yog tsim los ntawm kev ntsuas nruab nrab ntsev tsuag. Nws yog ntxiv ib co glacial acetic acid rau 5% sodium chloride tov, kom pH nqi ntawm cov tshuaj poob mus txog 3, cov tshuaj yuav acidic, thiab thaum kawg cov ntsev tsuag yog tsim los ntawm nruab nrab ntsev tsuag rau hauv acid. Tus nqi corrosion yog kwv yees li peb zaug sai dua qhov kev sim NSS.
(3) Copper ntsev accelerated acetate spray test (CASS test) yog cov tshuaj ntsev ntsev sai sai tau tsim tawm tsis ntev los no txawv teb chaws. Qhov ntsuas kub yog 50 ℃, thiab ib qho me me ntawm tooj liab ntsev - tooj liab chloride yog ntxiv rau hauv cov ntsev ntsev kom ua rau muaj kev xeb. Nws corrodes txog yim npaug sai dua qhov kev xeem NSS.
Raws li ib puag ncig ib puag ncig, cov qauv hloov pauv lub sijhawm hauv qab no tuaj yeem raug xa mus rau:
Neutral ntsev tsuag kuaj 24h ib puag ncig ntuj rau 1 xyoos
Acetate mist kuaj 24h ib puag ncig ntuj rau 3 xyoos
tooj liab ntsev ceev acetate mist kuaj 24h ib puag ncig ntuj rau 8 xyoo
Yog li ntawd, nyob rau hauv saib ntawm Marine ib puag ncig, ntsev tsuag, ntub thiab qhuav alternating, freeze-thaw yam ntxwv, peb ntseeg hais tias cov corrosion kuj ntawm nuv ntses nkoj fittings nyob rau hauv xws li ib puag ncig yuav tsum tsuas yog ib feem peb ntawm cov pa kev ntsuam xyuas.
Yog li ntawd, nyob rau hauv saib ntawm Marine ib puag ncig, ntsev tsuag, ntub thiab qhuav alternating, freeze-thaw yam ntxwv, peb ntseeg hais tias cov corrosion kuj ntawm nuv ntses nkoj fittings nyob rau hauv xws li ib puag ncig yuav tsum tsuas yog ib feem peb ntawm cov pa kev ntsuam xyuas.
Yog vim li cas peb thiaj li yuav tsum muaj lub nkoj nuv ntsesHlau halide teeb ballastthiab capacitors ntsia hauv tsev. Lub teeb tuav ntawm lub4000w nuv ntses lub teeb ntawm lub nkojyuav tsum tau muab ntim nrog cov khoom uas tuaj yeem tiv taus ntau dua 230 degrees Celsius. Txhawm rau kom ntseeg tau tias cov teeb pom kev nuv ntses hauv kev siv cov txheej txheem, yuav tsis poob cov nyhuv sealing, thiab mus rau hauv cov ntsev tsuag, ua rau lub teeb cap corrosion, ua rau lub teeb ci tawg.
Saum toj no, a4000w nuv ntses teeb uas nyiam tunatau siv los ntawm lub nkoj nuv ntses rau ib nrab xyoo. Tus thawj coj tsis tau khaws lub teeb nyob rau hauv ib qho chaw qhuav ntawm av los yog xyuas lub foob ntawm lub teeb vim nws tau saib xyuas cov kob rau ib xyoos. Thaum nws siv lub teeb dua tom qab ib xyoos, lub nti ntawm lub teeb tawg
Post lub sij hawm: May-15-2023