Kub Dipped Galvanizing txheej txheem piav qhia: Kauj ruam -los ntawm - Cov kauj ruam qhia
Kub-dip galvanizing yog ib txoj hauv kev zoo tshaj plaws los tiv thaiv cov hlau los ntawm corrosion. Cov txheej txheem tsim cov txheej txheem metallurgically bonded zinc txheej uas tuaj yeem tiv thaiv steel rau 50+ xyoo nyob rau hauv feem ntau ib puag ncig. Txawm hais tias koj tab tom nrhiav galvanized steel kav, galvanized steel coils, los yog cov khoom siv, kev nkag siab txog cov txheej txheem galvanizing pab koj ntsuas cov khoom zoo thiab txiav txim siab yuav khoom zoo dua.
Kub-Dip Galvanizing yog dab tsi?
Kub-dip galvanizing yog txheej txheem uas ntxuav cov hlau rau hauv da dej ntawm zinc molten ntawm kwv yees li 450℃(842℃F). Cov zinc reacts nrog steel nto los ua ib tug series ntawm zinc- hlau alloy txheej, topped los ntawm ib txheej ntawm ntshiab zinc. Daim ntawv cog lus metallurgical no muaj zog dua li cov txheej txheem txheej txheem - nws tsis tuaj yeem nti, tev, lossis flake tawm raws li ib txwm muaj.
Lub resulting txheej muab ob hom kev tiv thaiv:
Barrier tiv thaiv:Cov zinc txheej lub cev cais cov hlau los ntawm cov khoom corrosive hauv ib puag ncig
Sacrificial (cathodic) tiv thaiv:Zinc yog ntau electrochemically nquag tshaj hlau, yog li nws corrodes nyiam, tiv thaiv cov hlau txawm tias khawb thiab txiav npoo.
Kub-Dip Galvanizing txheej txheem: Ib kauj ruam los ntawm kauj ruam
Kauj Ruam 1: Kev Npaj Nto - Degreasing
Thawj kauj ruam tshem tawm cov kab mob organic xws li roj, roj, thiab kos cov roj nplua nyeem los ntawm steel nto. Cov hlau yog immersed nyob rau hauv ib tug kub alkaline ntxuav kua (feem ntau 70-90 degree) uas muaj sodium hydroxide los yog zoo li degreasing agents. Cov kauj ruam no yog qhov tseem ceeb vim tias cov roj lossis roj uas tseem tshuav ntawm qhov chaw yuav tiv thaiv zinc ntawm kev sib raug zoo.
Kev kuaj xyuas zoo:Tom qab degreasing, qhov saum npoo yuav tsum yog dej tsis sib npaug - tawg dawb - dej yuav tsum tau muab cov ntawv sib npaug thoob plaws qhov chaw tsis muaj beading, qhia tias tag nrho cov kab mob organic tau raug tshem tawm.
Kauj Ruam 2: Kev Npaj Nto - Acid Pickling
Tom ntej no, cov hlau yog immersed nyob rau hauv ib tug dilute hydrochloric acid (HCl) los yog sulfuric acid (H₂SO₄) tov kom tshem tawm xeb, zeb nplai, thiab oxides. Cov kauj ruam no etches steel nto, tsim ib qho kev ntxhib los mos me ntsis uas txhawb zinc adhesion. Hom acid concentration yog 5-15% HCl nyob rau hauv chav tsev kub, nrog rau immersion lub sij hawm ntawm 5-30 feeb nyob ntawm seb cov qib ntawm oxidation.
Kauj Ruam 3: Kev Npaj Nto - Rinsing
Nyob nruab nrab ntawm txhua kauj ruam kev kho tshuaj, cov hlau yuav tsum tau muab yaug nrog dej huv kom tsis txhob hla -kev sib kis ntawm cov tshuaj tov. Ob chav tso tso tsheb hlau luam feem ntau siv los xyuas kom meej tshem tawm cov kua qaub seem.
Kauj Ruam 4: Fluxing
Fluxing yog ib kauj ruam tseem ceeb uas npaj cov hlau nto rau zinc bonding. Cov hlau yog immersed nyob rau hauv ib tug flux tov - feem ntau zinc ammonium chloride (ZnCl₂·2NH₄Cl) ntawm 60-80℃. Lub flux ua haujlwm rau ntau lub hom phiaj:
Tshem tawm cov yeeb yaj kiab oxide seem uas tau tsim tom qab pickling
Tiv thaiv oxidation tshiab ua ntej cov hlau nkag mus rau hauv zinc da dej
Txo qhov nro ntawm cov zinc molten, ua kom tiav ntub dej
Txhawb kev tsim cov txheej txheem zinc - hlau alloy
Tom qab fluxing, cov hlau tau qhuav hauv qhov cub kom qhuav ntawm 100-120℃kom evaporate noo noo ua ntej nkag mus rau hauv lub molten zinc da dej.
Kauj Ruam 5: Zinc Da Dej Immersion (Galvanizing)
Qhov no yog qhov tseem ceeb ntawm cov txheej txheem. Cov hlau qhuav yog txo qis rau hauv da dej ntawm molten zinc ntawm 445-465℃. Lub sij hawm immersion nyob ntawm cov hlau thickness thiab complexity - feem ntau 3-10 feeb. Thaum lub sij hawm immersion, zinc reacts nrog steel nto los tsim ntau txheej:
Gamma txheej (Fe₃Zn₁₃):Innermost txheej, 75-78% hlau, nyias thiab tawv heev
Delta txheej (FeZn₇):90-93% zinc, nruab nrab thickness, muab hardness
Zeta txheej (FeZn₁₃):94-95% zinc, thickest alloy txheej, muab lub ntsiab barrier
Eta txheej (ntshiab zinc):Txheej txheej sab nrauv, 100% zinc, muab kev tiv thaiv kev txi
Tag nrho cov txheej tuab feem ntau yog li ntawm 60 txog 275 g / m² nyob ntawm lub sijhawm immersion, steel muaj pes tsawg leeg, thiab da dej kub.
Kauj Ruam 6: Tshem tawm thiab txias
Cov hlau yog maj mam thim tawm ntawm zinc da dej ntawm tus nqi tswj kom ntseeg tau tias cov txheej txheej tuab thiab tiv thaiv zinc drips. Qhov kev tshem tawm ceev cuam tshuam rau txheej txheej thickness - qeeb tshem tawm ua rau cov txheej tuab. Tom qab tshem tawm, cov hlau galvanized yog txias rau hauv huab cua los yog quenched hauv dej kom solidify zinc txheej.
Kauj Ruam 7: Quenching thiab Passivation (Yeem)
Rau qee qhov kev siv, cov hlau galvanized yog quenched hauv dej -raws li cov tshuaj passivation los tiv thaiv "dawb xeb" (zinc oxide / hydroxide) tsim thaum khaws cia thiab thauj. Chromate passivation yog ib txwm siv, tab sis ib puag ncig tus phooj ywg lwm txoj hauv kev xws li molybdate lossis silicate -raws li passivation tam sim no muaj ntau.
Kauj Ruam 8: Kev Tshawb Fawb Kawg thiab Kev Xeem
Kev tshuaj xyuas zoo yog qhov kawg thiab tseem ceeb tshaj. Standard xeem muaj xws li:
Txheej thickness ntsuas:Siv cov khoom sib nqus tuab ntawm ASTM A123 lossis ISO 1460
Kev kuaj pom pom:Txheeb xyuas qhov zoo li qub, tsis muaj qhov liab qab, tsis muaj tev lossis hlwv
Adhesion Test:Hla -hatch lossis khoov kuaj kom paub tseeb tias txheej adhesion
Kev kuaj xyuas embrittlement:Xyuas kom tseeb tias cov hlau tsis nkig thaum lub sij hawm galvanizing
Txheej Thickness Standards
| Txuj | Khoom siv | Min. Txheej (g / m²) | Min. Thickness (hli) |
|---|---|---|---|
| ASTM A123 | Cov yeeb nkab steel | 458 | 64 |
| TS EN ISO 1461 | Hlau Loj dua lossis sib npaug li 6 hli | 350 | 50 |
| TS EN 10346 | Hlau ntawv | 120-275 | 17-39 |
| GB/T 13912 | Hlau Loj dua lossis sib npaug li 6 hli | 305 | 43 |
Tej yam tsis xws luag thiab yuav ua li cas zam lawv
| Tsis zoo | Ua rau | Kev tiv thaiv |
|---|---|---|
| Pleev Spots (uncoated area) | Kev tu tsis tiav, flux depletion | Xyuas kom zoo degreasing thiab pickling; ua kom lub cev muaj zog |
| Zinc drips thiab khiav | Tshem tawm sai, da dej kub tsawg | Tswj kev tshem tawm ceev; tuav da dej ntawm 450-465 degree |
| Tshauv suav nrog | Zinc tshauv ntawm da dej nto tsis tshem tawm | Skim zinc tshauv ua ntej immersion thiab thaum tshem tawm |
| Grey txheej (tsis muaj spangle) | High silicon cov ntsiab lus hauv steel (Sandelin effect) | Siv qis- silicon steel (Si Tsawg dua lossis sib npaug li 0.03% lossis 0.15-0.25%) |
| Dawb xeb thaum khaws cia | Moisture condensation ntawm tshiab galvanized nto | Siv passivation; cia nyob rau hauv qhuav, ventilated tej yam kev mob |
Cov lus nug nquag
q: Qhov kub -dip galvanized txheej yog tuab npaum li cas?
A:Kub-dip galvanized txheej thickness feem ntau yog li ntawm 50 mus rau 200 μm (350-1400 g / m²), nyob ntawm seb steel thickness, immersion lub sij hawm, thiab steel muaj pes tsawg leeg. Rau cov qauv hlau, qhov tsawg kawg nkaus txheej ntawm ASTM A123 yog kwv yees li 64 μm (458 g / m²).
Q: Puas yog kub -dip galvanizing tsis muaj zog hlau?
A:Tsis yog. Qhov kub ntawm galvanizing (450 degree) yog qhov zoo hauv qab qhov kev hloov pauv ntawm cov hlau, yog li nws tsis cuam tshuam rau cov hlau cov khoom siv kho tshuab. Txawm li cas los xij, siab -silicon steel tej zaum yuav muaj qee qhov embrittlement - ib txwm qhia qis-silicon steel rau galvanizing.
Q: Kub-dip galvanizing ntev npaum li cas?
A: Nyob rau hauv cov huab cua puag ncig, kub -dip galvanized txheej muab 50+ xyoo ntawm kev txij nkawm- tiv thaiv dawb. Nyob rau hauv ib puag ncig corrosive heev (nrog ntug dej hiav txwv, kev lag luam), kev pab cuam lub neej yuav yog 25-40 xyoo. Hauv av, hauv av nruab nrab, galvanized steel tuaj yeem nyob ntev 75+ xyoo.
Xaus
Cov txheej txheem kub -dip galvanizing yog ib qho pov thawj, txhim khu kev qha rau kev tiv thaiv hlau los ntawm corrosion. Los ntawm kev nkag siab txhua kauj ruam - los ntawm kev npaj nto los ntawm zinc immersion mus rau qhov kawg tshuaj ntsuam - cov neeg yuav khoom tuaj yeem ntsuas qhov zoo ntawm cov khoom siv hlau galvanized thiab xyuas kom lawv ua tau raws li qhov project specifications.
Ntawm Tianjin Kun Yu Technology, tag nrho peb cov khoom siv hlau galvanized raug tswj xyuas zoo ntawm txhua theem ntawm cov txheej txheem galvanizing. Peb cov khoom ua tau raws li ASTM, ISO, EN, thiab GB cov qauv, thiab peb muab Mill Test Certificate nrog txhua yam khoom xa tuaj. Tiv tauj peb kom paub ntau ntxiv txog peb cov khoom siv galvanized steel.
