Cov khoom siv hlau corrode thaum ua haujlwm. Raws li kev tiv thaiv qhov no, cov hlau yog galvanized. Kev siv tshuab ntawm kev ua haujlwm hauv tsev yog qhov pheej yig heev. Nws yog ib qho tseem ceeb uas yuav tau xaiv qhov kev xaiv ua tiav.
Zib plating yog dab tsi
Txhua cov ntsiab lus hlau raug cuam tshuam rau qib sib txawv ntawm cov txheej txheem corrosive. Koj ua tsis tau yog tsis muaj nws. Thiab cov txheej txheem no tsuas tuaj yeem ncua sijhawm. Nws yog rau lub hom phiaj no uas siv zinc kho. Qhov kev xaiv ntawm cov khoom no tsis yog yuam kev. Kev xaiv yog tsim los ntawm cov yam ntxwv ntawm ob yam: hlau thiab zinc. Zinc muaj cov nqi hluav taws xob ntau dua li cov hlau. Thaum cov zinc txheej yog siv rau cov khoom siv hlau, ib daim ntawv cog lus galvanic yog tsim los ntawm cov hlau thiab zinc. Vim qhov no, nyob rau hauv kev cuam tshuam ntawm ib puag ncig ib puag ncig, zinc nkag mus rau hauv cov tshuaj tiv thaiv. Cov tshuaj tiv thaiv uas cuam tshuam nrog steel qeeb. Thiab yog li ntawd nws yuav txuas ntxiv mus txog thaum lub zinc txheej puas tag.
Thaum cov txheej txheej zinc tawg, kev tiv thaiv txuas ntxiv mus. Qhov no yog vim lub fact tias zinc reacts nrog atmospheric oxygen. Raws li qhov tshwm sim ntawm cov txheej txheem tshuaj, zinc hydroxide yog tsim. Thiab cov khoom no kuj muaj cov khoom tiv thaiv. Yog li, galvanizing ntawm cov hlau tseem ua haujlwm.
Zinc txheej txheem
Zinc txheej ntawm cov khoom siv hlau yog txoj hauv kev nrov tshaj plaws los tiv thaiv corrosion. Qhov no yog vim qhov sib piv ntawm qhov kev sim siab thiab tus nqi pheej yig. Cov txheej txheem hlau galvanizing hauv qab no yog siv:
- cold;
- hot;
- electroplated;
- thermodiffusion;
- gas thermal.
Xaiv qhov kev xaiv uas haum rau koj tus kheej, koj yuav tsum ua ntej txheeb xyuas cov xwm txheej uas cov khoom yuav raug siv yav tom ntej. Qhov zoo ntawm galvanizing nyob ntawm lub txheej thickness, tiv thaiv lub sij hawm thiab kub. Ua-nws-koj tus kheej galvanizing ntawm hlau tsuas yog ua tau ob txoj hauv kev: txias thiab galvanic. Nws yuav tsum tau muab sau tseg tias lub durability ntawm ib feem uas kho nyob rau hauv no txoj kev yuav nyob ntawm seb cov kev khiav hauj lwm tej yam kev mob. Cov txheej zinc yog yooj yim raug rau txhua yam kev nyuaj siab.
Hot way
Kub galvanized hlau yog qhov kev xaiv zoo tshaj plaws. Cov tshuaj reagent yog siv los kho qhov chaw ntawm cov khoom. Nrog lawv cov kev pab, cov hlau yog npaj rau qhov tseem ceeb ntawm cov txheej txheem. Nws yog vim qhov no uas muaj teeb meem ib puag ncig tshwm sim. Rau cov txheej txheem, straightened zinc yog siv. Cov khoom npaj tsuas yog txo qis rau hauv da dej ntawm moltenzinc.
txheej txheem no yuav tsum muaj cov cuab yeej tshwj xeeb. Yog li, txoj kev no tsis haum rau galvanizing hlau hauv tsev.
Thermodiffusion method
Galvanizing hlau nyob rau hauv txoj kev no suav nrog kev nkag mus ntawm zinc atoms rau hauv cov qauv ntawm cov khoom hlau nrog tsim cov hlau-zinc alloy nrog cov qauv nyuaj. Tag nrho cov txheej txheem yuav siv qhov chaw ntawm qhov kub thiab txias heev. Ntawm qhov kub ntawm ntau tshaj 2600 degrees, zinc nkag mus rau hauv lub xeev gaseous. Qhov chaw kaw qhov chaw uas cov khoom siv hlau nyob yog ntim nrog zinc-muaj hmoov. Txoj kev tsim nyog rau kev thov ib txheej uas nws thickness tshaj 15 μm. Qhov tshwm sim tiv thaiv txheej nyob rau hauv cov nqe lus ntawm kev ruaj ntseg yuav muab piv nrog ib txheej thov los ntawm txoj kev kub. Vim qhov xav tau los tsim qee yam kev mob, cov txheej txheem tsis haum rau kev siv tus kheej.
Gas-thermal method
Nrog rau txoj kev no, zinc, uas yog nyob rau hauv daim ntawv ntawm ib tug hmoov, yog sprayed nrog ib tug huab cua kwj rau saum npoo ntawm cov khoom hlau. Ua ntej txau, cov khoom yog yaj vim qhov kub thiab txias thiab twb nyob rau hauv lub xeev no nws ntog rau ntawm qhov chaw. Galvanizing hlau zoo ib yam li cov rooj plaub uas cov khoom hlau muaj qhov loj me.
Txoj kev ntawm txoj kev yog tias txheej tiv thaiv muaj ntau qhov pores. Txhawm rau sau lawv, cov khoom yog them nrog cov xim thiab cov kua roj vanish. Cov txheej txheem ntawm ob cov ntaub ntawv no muaj peev xwm ua taunyob ruaj rau 30 xyoo. Txoj kev no yuav siv tsis tau tom tsev.
Cov galvanizing tom tsev
Tseem muaj qhov txias galvanizing. Galvanizing hlau hauv txoj kev no suav nrog kev siv zinc rau cov khoom siv hlau hauv daim ntawv xim. Cov neeg tsim khoom muaj ntau yam ntawm cov nyiaj no. Thiab cov ntsiab lus tseem ceeb ntawm cov khoom sib xyaw (piv txwv li, feem ntau ntawm zinc hauv cov khoom) tuaj yeem sib txawv ntawm ib leeg. Nws paub meej tias cov txiaj ntsig ntawm kev ua haujlwm kuj yuav txawv.
txhais tau tias rau galvanizing muaj ntau yam nta. Qee qhov xav tau kev npaj cov khoom zoo. Cov tom kawg muaj peev xwm nplaum nplaum tsawg, yog li ntawd, tom qab ziab, lawv pib tev tawm. Tseem muaj lwm tus, tom qab daim ntawv thov, raug them nrog "cobweb" ntawm cov kab nrib pleb. Qhov thib plaub tuaj yeem ua haujlwm ua ke nrog cov kuab tshuaj ntawm ib hom tshwj xeeb. Fifths xav tau daim ntawv thov cov cuab yeej tshwj xeeb.
Cov cuab yeej no yog ob lub ntsiab lus. Yog li ntawd, ua ntej thov, ob yam tshuaj (hmoov thiab binder) yuav tsum tau tov ua ke. Ua qhov no hauv qhov sib piv ntawm 3 mus rau 1 lossis 1 rau 1. Cov txheej txheem tag nrho yuav tsum tau ua raws li qee yam xwm txheej. Cov huab cua kub yuav tsum zoo thiab nyob rau hauv thaj tsam ntawm 5 mus rau 40 degrees. Nyob rau tib lub sijhawm, huab cua av noo nyob ntawm 30 txog 98%. Chav tsev nyob rau hauv uas tus txheej txheem yog nqa tawm yuav tsum tau zoo ventilated. Tom qab ua haujlwm, nws yuav tsum tau ua kom huv si. Tus neeg sawv cev yog siv rau hauv ob txheej nrog lub sijhawm kwv yees li 30 feeb. Tom qab ib hnub, cov khoom tuaj yeem ua taunpog nrog cov xim. Thaum galvanizing, cov cai tswj kev nyab xeeb yuav tsum tau ua raws. Txhua txoj haujlwm yog ua los ntawm cov khoom siv tiv thaiv tus kheej.
Galvanic method
Galvanizing hlau hauv tsev tuaj yeem ua los ntawm galvanizing. Txhawm rau ua qhov no, cov khoom yuav tsum tau muab ntxuav ua ntej. Tom qab ntawd, ib feem yog txo qis rau ob peb feeb (los ntawm 2 mus rau 10) hauv sulfuric acid. Tom qab ntawd, cov khoom yog ntxuav hauv dej. Qhov no ua tiav qhov kev npaj rau anodizing. Rau installation nyob rau hauv galvanizing, nws yog tsim nyog los xaiv cov tais diav los ntawm inert cov ntaub ntawv, piv txwv li, iav. Lub thawv raug xaiv raws li ib feem nrog ib qho electrode txuas rau nws tuaj yeem haum rau hauv nws.
Qhov chaw tam sim no yuav yog lub charger rau 6-12 V thiab 2-6 A. Tom ntej no, ib qho electrolyte yog npaj - ib qho kev daws ntawm cov ntsev yaj hauv dej. Hauv kev xyaum, nws yog qhov zoo dua los noj zinc ntsev. Koj tuaj yeem noj diluted sulfuric acid (raws li hauv lub roj teeb) thiab ntxiv zinc rau ntawd. Raws li qhov tshwm sim ntawm cov tshuaj tiv thaiv, cov kua qaub yuav tig mus rau hauv cov ntsev insoluble thiab precipitate. Thiab zinc yuav nyob twj ywm hauv kev daws. Lub precipitate yuav tsum tau muab tshem tawm los ntawm tsuas yog straining cov tshuaj.
zinc electrode yog tsim los ntawm ib daim zinc txuas rau tooj liab. Los ntawm lub charger, " rho tawm" yog coj mus rau ib feem, thiab "ntxiv" rau zinc. Yog li, zinc electrode yuav yaj, thiab tag nrho cov zinc atoms yuav nyob ntawm qhov chaw.
Zaj lus
Galvanizing hlau hauv tsev yog txheej txheem tiag tiag. Txhawm rau siv nws, koj yuav tsum tau yuav khoomqee yam khoom siv. Piv txwv li, zinc-raws li xim rau cov txheej txheem txias los yog ib daim zinc rau electroplating. Los ntawm txoj kev, zinc tuaj yeem yuav ntawm txhua qhov chaw khaws khoom seem.
