Dab tsi yog qhov sib txawv ntawm kub - dip galvanizing thiab electrogalvanizing?
Kub - dip galvanizing (HDG) thiab lub npe hu ua kom txias galvanizing galvanizing rau galvanizing cov kav dej puag ncig pipes. Lawv cov tub ntxhais sib txawv sib txawv nyob rau hauv txoj ntsiab cai tsim muaj, tuab, ua tau zoo, thiab thov sau cov xwm txheej ntawm galvanized txheej. Cov kev sib txawv no hauv cov txheej txheem ntws ncaj qha txiav txim siab txog cov yam ntxwv ntawm cov khoom kawg. Cov txheej txheem hauv qab no cov txheej txheem ntws los ntawm ob qhov kev xav: "txheej txheem sib tsoo" thiab "tseem ceeb sib piv kev sib piv":
1. Kub {- dip galvanizing (HDG) cov txheej txheem: siab}} kub galosite ntawm "alloy + ntshiab zinc"
Lub ntsiab cai tseem ceeb ntawm kub - dip galvanizing yog kom lub zinc round rauv yeeb yaj kiab hauv Molten Zinc (kwv yees li 440 {} 4 ° c). Los ntawm kev siv tshuaj lom neeg thiab kev ntub dej ntawm cov hlau, sib khi nruj "}}}}}}}}}}}}}}}}}}}}}}}} all iron all້ອ kib + yog tsim ntawm cov yeeb nkab. Nov yog "siab - kub} kub ntsuas kub ... txheej txheem. Cov txheej txheem ua tiav tuaj yeem muab faib ua peb theem: ua ntej {{{{} Kev kho, kub}} dip galvanizing, thiab kev kho mob tom qab. Cov kauj ruam tshwj xeeb yog raws li hauv qab no:
1. Ua ntej no {{{- kev kho mob: tshem tawm cov impurities thiab kom Zinc Txheej Txheej (yog cov kauj ruam tseem ceeb).
Lub hom phiaj tseem ceeb ntawm pre - Kev Kho Mob Tshem tawm cov roj, nplai, thiab xeb cov hlau ntshiab afstrate. Txwv tsis pub, lub zinc txheej yuav yooj yim poob.
Degreasing (degreasing): Tso lub raj round nyob rau hauv ib qho alkaline degreaser (xws li sodium hydroxide tov) lossis cov kuab tshuaj- Raws li cov. Raus, tsuag, los yog ultrasonically huv lub raj kom tshem tawm cov roj av xws li roj tiv thaiv roj thiab xeb tiv thaiv cov roj teeb uas muaj kev tsim khoom thiab chaw cia khoom.
Acid tu (xeb / teev tshem tawm): Tom qab hloov lub raj rau lub tank tank (ib txwm muaj 15-30 feeb (kho raws li kev xeb ntawm xeb). Qhov no yaj cov nplai npoo (fe₂o₃, fe₃o₄) thiab xeb, pom cov tshiab, tawm-dawb hlau nto. Rinsing (Neutralization): Tom qab pickling, tej yam residual acid ntawm cov yeeb nkab tank (xws li sodium carbonate tank (tom qab ntawd tiv thaiv kev corrosion ntawm substrate. (Yog hais tias residual acid tseem, zinc slag yuav tsim thaum zinc ntsw, cuam tshuam rau qhov zoo ntawm zinc txheej.)
Kev ua kom ua kom: tom qab yaug, cov yeeb nkab puag ncig yog tso rau hauv "plinc chloride {}} ammonium chloride aque kua). Tom qab ziab, ib qho tsis zoo nkauj ntsev yeeb yaj duab ntawm cov yeeb nkab nto. Qhov no ua haujlwm rau cov hom phiaj hauv qab no: 1. Nws cais cov yeeb nkab los ntawm huab cua, kev tiv thaiv theem nrab ntawm lub substrate ua ntej nkag mus rau cov lauj kaub zinc; 2. Nws txo cov nro hauv zinc, txhawb nws qhov kev nkag mus rau hauv cov yeeb nkab saum npoo {}} kub dinc rechersion rau tsim ib qho kev sib xyaw (tub ntxhais theem)
Kom qhuav / preheating: tom qab glues galvanizing, lub voj voog hlab yog muab tso rau hauv lub tshuab ntub dej (kwv yees li ntawm cov dej noo, uas tuaj yeem ua rau zinc sib cais (kev phom sij nyab xeeb). Cov hlab yog tseem preheated rau 80-120 ° C kom txo qhov kub qhov sib txawv nrog cov da dej zinc los ntawm zinc slag los ntawm kev kub npau npau.
Zinc ntsw: cov kab ncig ua ntej yog maj mam raus rau hauv Molten Zinc (440 {{° c). Lub sij hawm siv hluav taws xob tau muab kho raws li lub raj raj phab ntsa tuab (kwv yees li 30} 60 vib nas this rau cov raj ntsa nyias thiab 1-2 feeb rau cov raj raj thuv-walled). Ob qho kev cuam tshuam tseem ceeb tshwm sim thaum lub sijhawm no:
① Qhov kev siv tshuaj lom neeg tshwm sim ntawm cov hlau substrate thiab cov zinc da dej: FE + ZN → fezn₇ (ib qho zinc {}}} Ik hlau alloy txheej). Cov txheej no tau sib khi nruj rau cov substrate thiab yog cov tub ntxhais ntawm corrosion tiv thaiv.
② Zinc da dej Depositing ntawm cov txheej alloy, sib sau ib qho ntshiab zinc txheej (feem ntau 70% -80% ntawm tag nrho cov txheej tuab). Zinc Tswj: Tom qab zinc ntsw, lub raj hloov hloov maj mam maj mam muab tshem tawm los ntawm cov laujk zinc. Compressed huab cua yog tshuab kom deb (lossis ib qho tshwj xeeb "zinc ntawm cov raj zinc tuab (kev tswj hwm" Zinc Nodules ") thaum ua kom tiav cov txheej txheem sib dhos.
3. Post {{{{{{{}} kev: pom kev zoo thiab ua tau zoo
Cua txias: lub zinc - tswj lub raj txias sau nkag mus rau hauv dej txias (feem ntau yog siv dej txias lossis tsis muaj zog txias rau chav sov. Qhov xwm txheej no ruaj khov rau cov qauv zinc txheej thiab tiv thaiv oxidation thiab discoloration ntawm cov kub.
Passivation (yeem): hauv qee cov ntawv thov (piv txwv li, yuav tsum tau ua kom lub raj muaj ntshav ntxiv), muaj cov tub rog sib tsoo ua kom tsis txhob muaj cov yeeb yaj kiab
Tshuaj xyuas: Kos cov txheej tuab (feem ntau yog siv cov txheej txheem tuab tuab (txheej txheem sib nqus)