1.How kiag li tshem tawm cov roj stains thiab zam "kev xyeej pov tseg ntawm zinc txheej"?
Roj tuaj yeem haus: Rolling roj, roj roj, thiab lwm yam paug ntawm cov kab sib cais tuaj yeem tsim cov lej zinc, "electrolyte los ntawm tag nrho cov substrate. Thaum Galvanizing, cov txheej zinc yog nyias lossis tseem tsis tuaj yeem nyob rau hauv thaj chaw oily, ua rau "motten" tsos.
SafeGuards:
Xaiv cov txheej txheem degreasing raws li cov roj stain: alkaline degreiting (}}}}}}}}}}}}}}}}}}}}}}} pa emulsification) yog pom zoo rau tsiaj thiab Cov roj zaub raws qib.
Kev tswj hwm cov ntsuas tsis zoo: Degreat kev daws teeb meem (Alkaline lub sijhawm ua kom muaj zog yog li 5 feeb, lossis siv cov tshuaj txau tau ntxiv mus rau 5 feeb.
Tshaj tawm -}}}}}} tu: cov yeeb yaj kiab tsis sib xws (remidual alkaline tshuaj yuav ua rau muaj kev sib txawv, overly sai li sai tau thaum mus rau tom ntej).
2.How kom tshem tawm cov xeb / teev?
Qhov cuam tshuam ntawm Oxide Nplai / Rust: Oxide Nplai (Fe₃o₄, thiab lwm yam) lossis RAWS LI CAS (FEO) Thaum Galvanizing, zinc txheej tsis tuaj yeem ua raws li cov nplai oxide (lossis yooj yim ntog tom qab nws zinc ib qho thickness hloov pauv. " SafeGuards:
Pickling (Mainstream Txujci): Soak hauv hydrochloric acid (15% {8%) kom tshem tawm impurities ntawm cov acid thiab nplai / xeb. Tswj xyuas qhov kub (20-40 qib
Ntu kev kho mob: rau tuab nplai, xws li txhuam hniav lossis cov txhuam hniav hlau) tuaj yeem ua ntej pickling kev hloov pauv. Tom qab pickling, neutralize lub substrate nrog lub zog alkaline tov (na ₂₂₂₃, pH 8-9) kom tshem tawm cov khoom qub. Yaug nrog dej kom txog thaum lub substrate yog nruab nrab (pH 6-7).
3.How los kho lub substrate nto roughness thiab phaj kho looj?
Kev cuam tshuam roughness cuam tshuam: cov kev ntxhib hlob heev Ib qho chaw du nrog micro micro- pitting tuaj yeem ua rau kev daws teeb meem
Sawb Daim Qauv Cuam Tshuam: Cov hlau strip (piv txwv li, cov kab hlau galvanized los ntawm cov kab sib txawv ntawm cov kab sib txawv, uas ua rau muaj kev hloov pauv hauv zinc txheej thickness.
SafeGuards:
Substrate Rolling Control: kom ntseeg tau tias cov khoom siv roughness thaum lub sij hawm tov txias (piv txwv li tsis pub dhau hauv 1-3μm) thiab zam kev sib tsoo hauv zos kom tshem tawm cov tsis tu ncua.
Sawb puab kev txhim kho: ua ntej nkag mus rau hauv cov kab galvanizing, piv txwv tsis sib xws ntawm cov khoom siv laim ntom nti
4.How kho kom haum nyob rau hauv kub - dip galvanizing txheej txheem?
Zinc da dej kub thiab Galvanizing sijhawm: Zam kev tiv thaiv tsis ncaj
Excessively high molten zinc temperature (>480 Qib) tuaj yeem ua rau cov hlau - zinc cov tshuaj tiv thaiv nyob rau sab saum toj kom nrawm txheej thiab ua kom muaj ntxeem tau. Ntxiv mus, Molten Zinc yog kua muag dhau, ua rau loj hloov pauv nyob rau hauv tus nqi ntawm Molten Zinc nqa ntawm sawb / workpiece. Txhawb tsis tshua muaj Molten zinc Kub (<430°C) results in high viscosity and poor fluidity, leading to uneven accumulation on the substrate surface (e.g., stagnation in corners).
Qhov ntsuas kub yuav tsum tau tswj hwm ntawm lub qhov sov so ntawm 445 - 455℃(hauv ± 5 degree). Lub sijhawm galvanizing yuav tsum ua kom haum rau cov tuab ntawm cov tuab tuab (1-3 vib nas this rau nyias sawb, 5-10 vib nas this rau tuab workpieces). Kev tswj kom meej yuav tsum ua tiav los ntawm kab ceev (rau cov kab txaij Cov Riam Riam Tswj (Cov Tub Ntxhais ntawm kub-dip Galvanizing): precisely "scape tawm" ntau dhau zinc
Tom qab cov sawb yog kos los ntawm Molten zinc, ntau dhau zinc adheres rau saum npoo. Qhov kev txiav txim siab dhau los zinc yuav tsum tau muab tshem tawm los ntawm "cua rab riam" (lub siab- siab cua nozzle). Cov rab riam cua ncaj qha txiav txim siab txog kev hnav khaub ncaws zinc txheej tuab:
Cov Riam Rwb Siab: Tsawg dhau lub siab yuav tiv thaiv kom tsis txhob muaj kev lom zem tshaj plaws (ua rau muaj kev sib tw zoo dua) Cov riam cua siab yuav tsum tau teeb tsa raws li lub hom phiaj zinc coating thickness (piv txwv li rau zinc txheej ntawm 80-120g / m², lub siab yog feem ntau 0.2 -0.4MPA). Tsis tas li ntawd, "siab yuav tsum tau sib txig thoob plaws txhua lub sawb" (los ntawm kev tsim cov hluav taws xob sab hauv ntau dua 0.02mpa ntawm ntug thiab nruab nrab).
Riam Riam Deb thiab lub kaum sab xis: Cov cua rab riam yuav tsum ceev qhov chaw nyob deb ntawm sawb (ib txwm muaj peev xwm ua rau cov khawb, thaum dhau mus dhau tuaj yeem ua rau lub siab poob thiab tsis sib luag). Cov cua rab riam lub kaum sab xis yuav tsum sib txuas rau cov sawb (hauv ± 1 degree) kom tsis txhob "sab tshuab." Qhov no tuaj yeem ua rau ib txheej zinc thinner ntawm ib sab.
Cua Riam Txuas: Muaj kev sib dhos sib txawv (± 0.1mm). Yog tias qhov sib txawv dav hauv zos, airflow tsis muaj zog ntawm qhov chaw, ua rau cov txheej zinc tuab tuab. Nquag tshuaj xyuas cov pa riam nozzle kom tshem tawm cov clogging tshwm sim los ntawm zinc Slag (hlau}
Zinc Da Dej Ua Si: Zam kev hloov pauv "flutionations"
Excessive Fe content in the zinc bath (>0.03%) Yuav tsim ntau npaum li cas cov hlau - zinc alloy slag, txo cov fluc, txo cov kua dej ntawm cov da dej zinc. Qhov kev txiav tawm no rau cov npoo av, sib sau "cov pob zeb slag" thiab ua rau cov txheej tsis sib xws. Zinc da dej huv (piv txwv li, ntxiv al los ua al {}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}<0.02%. Furthermore, the Al content (typically 0.15%-0.25% for hot-dip galvanizing) must be stable. Al improves the fluidity of the zinc bath; fluctuations in the Al content can lead to unstable zinc layer adhesion.
5.Txhua li cas kom paub meej tias "ruaj khov tawm ntawm cov txheej txheem tsis sib haum xeeb"?
Kub - dip galvanizing huab cua yuav tsum tau nruab nrog lub "kaw {} Kev siv cua siab yog tias kev hloov kho ntau dua 0.01 mpa). Cov nozzles yuav tsum tsis tu ncua ntau zaus (xyuas cov kev sib tw kis nrog cov ntsuas ntsuas ib hlis ib zaug).
Electrogalvanizing fais fab khoom yuav tsum siv "high {{0} ± hloov chaw fais fab tuag los ntawm tam sim no hloov pauv nrog cov khoom siv hluav taws xob uas muaj hwj chim. Anode Rods yuav tsum muaj cov insulated zoo los tiv thaiv kom tsis txhob xau thiab ib cheeb tsam txawv txav. Kev tshuaj xyuas ib txwm ntawm kev sib txuas ntawm anode thiab fais fab siv yog qhov yuav tsum tau los tiv thaiv kev sib cuag ntau dhau los ntawm kev faib tawm tam sim no.