Ib qho ntawm feem ntau nkag siab yuam kev ntawm kub-dip galvanizing yog vim li cas cov hlau tuab tuab ib txwm tsim cov zinc txheej tuab. Thaum xub thawj siab ib muag, ob lub thicknesses no yuav tshwm sim tsis sib xws, tab sis metallurgical cov tshuaj tiv thaiv kinetics thiab cov cua kub hloov tus cwj pwm piav qhia qhov kev sib raug zoo thiab kev kwv yees.
Cov Ntsiab Lus Metallurgical
Kub-dip galvanizing yog ib txheej txheem diffusion-tswj. Thaum cov hlau yog immersed nyob rau hauv molten zinc ntawm kwv yees li 840 mus rau 850℃F (449-454 degree), hlau thiab zinc hnov mob los ua ib tug sib lawv liag ntawm zinc-hlau intermetallic alloy txheej, metallurgically bonded rau cov hlau substrate.Cov txheej tsis yog ib tug deg deposit ntawm ntshiab zinc tab sis ib tug tseeb metallurgical transformation. Txheej kev loj hlob yog tswj hwm los ntawm qhov kub thiab txias, lub sijhawm immersion, steel chemistry, kub hloov pauv, thiab diffusion kinetics.
Lub luag haujlwm ntawm Thermal Mass
Qhov tseem ceeb tshaj plaws uas txuas steel thickness rau txheej thickness yog thermal loj. Ib qho tuab, hnyav steel seem muaj qhov thermal loj dua li nyias, lub teeb. Thaum immersed nyob rau hauv lub molten zinc da dej:
- Thicker seem khaws cov cua sov rau lub sijhawm ntev
- Lawv qhov txias txias tom qab tshem tawm ntawm da dej yog qeeb dua
- Cov tshuaj tiv thaiv kev loj hlob ntawm intermetallic yog li ntawd txuas ntxiv rau lub sijhawm siv tau ntev
Los ntawm qhov sib txawv, cov ntawv nyias lossis cov khoom siv lub teeb pom kev nce mus txog qhov sib npaug ntawm cov thermal sib npaug sai thiab txias sai sai thaum tshem tawm, txwv lub sijhawm muaj rau cov tshuaj tiv thaiv diffusion thiab feem ntau ua rau cov txheej txheem sib dua ntawm cov hlau nyias nyias.
Diffusion Kinetics thiab Layer Development
Raws li cov hlau tuab muaj qhov ntsuas kub ntev dua, cov hlau diffusion mus rau hauv cov zinc molten txuas ntxiv mus rau lub sijhawm ntev dua, cov txheej txheem intermetallic thickness nce, thiab tag nrho cov txheej thickness loj hlob proportionally.Steel thickness yog li indirectly influences txheej thickness los ntawm kev cuam tshuam lub sij hawm muaj tshuaj tiv thaiv.
Kev lag luam tus qauv - ASTM A123 & ISO 1461
Ob leeg ASTM A123 thiab ISO 1461 lees paub qhov kev ua tau zoo ntawm cov khoom siv hlau no los ntawm kev tsim cov txheej txheem tsawg kawg nkaus raws li cov tuab tuab tuab.Raws li ASTM A123, rau cov qauv duab thiab daim hlau, qhov tsawg kawg nkaus nruab nrab txheej txheej thickness nce zuj zus nrog steel thickness:
| Hlau Thickness | Yam tsawg kawg nkaus Avg. Txheej Thickness |
|---|---|
| < 1.6 mm | 45 μm |
| 1.6-3.2 hli | 65 μm |
| 3.2-4.8 hli | 75 μm |
| 4.8-6.4 hli | 85 μm |
| >6.4mm ib | 100 μm |
Rau nyias steel ntawv nyob rau hauv 1.5 hli, qhov yuav tsum tau yog 45 μm, thaum ib tug tuab txheej txheem beam tshaj 6 hli yuav tsum tau yam tsawg kawg nkaus 85 μm.Txhua txheej thickness yuav tsum yog yam tsawg kawg nkaus; tsis muaj qhov txwv siab tshaj plaws.
Yam khoom sib txawv
Rau cov ntawv hlau galvanized ntawm cov kab nruam (xws li tsheb lossis cov khoom siv hauv tsev), txheej thicknesses feem ntau yog li ntawm 6 μm mus rau 50 μm ib sab, nrog cov khoom txheem xws li Class G90 uas ua tau kwv yees li 18 μm ib sab.Cov khoom txuas ntxiv-galvanized txawv ntawm cov khoom sib txawv ntawm cov khoom sib txawv thiab cov txheej txheem sib txawv.
Cov kev cuam tshuam
Vim tias txheej txheej kev pab cuam lub neej nyob rau hauv atmospheric ib puag ncig yog kwv yees li proportional rau txheej thickness, thicker structural cov tswv cuab ib txwm ua tiav ntev durability yam tsis tas yuav tsum tau ntxiv txheej txheem hloov.Steel chemistry kuj tseem ceeb - cov ntsiab lus xws li silicon thiab phosphorus cuam tshuam reactivity thiab tuaj yeem ua kom cov txheej txheem txheej txheej, thiab thaum cov hlau tuab kuj tseem muaj cov tshuaj tiv thaiv kab mob ntxiv, thiab coatings tuaj yeem tshwm sim ntxiv.
Kev sib raug zoo ntawm steel substrate thickness thiab galvanized zinc txheej thickness tsis yog arbitrary. Nws muab tau ncaj qha los ntawm metallurgical cwj pwm ntawm cov txheej txheem kub-dip galvanizing. Lub peev xwm los ntsuas thiab qhia cov txheej thickness raws li steel thickness muab engineers nrog ib tug txhim khu kev qha, science-based moj khaum rau xaiv galvanized steel khoom uas yuav xa cov kev pab cuam lub neej nyob rau hauv lawv lub hom phiaj kev pab cuam.
