Galvalume steel coil yog cov khoom sib xyaw ua ke tsim los ntawm txheej txheej txias -rolled steel ntawv nrog aluminium thiab zinc alloy txheej los ntawm cov txheej txheem kho saum npoo. Lub hauv paus ntawm nws cov muaj pes tsawg leeg yog nyob rau hauv lub siab - kub kub- txheej txheem dip plating, uas tsim ib tug muaj zog metallurgical daim ntawv cog lus ntawm cov hlau txheej thiab lub substrate, ho txhim kho cov khoom siv huab cua tsis kam thiab kev pab lub neej.
Kev xaiv substrate thiab Pretreatment
Lub substrate rau galvalume steel kauj yog feem ntau qis -carbon txias- dov steel kauj nrog cov ntsiab lus carbon qis dua 0.1%. Nws undergoes flattening thiab annealing los xyuas kom meej nto flatness thiab mechanical zog. Ua ntej plating, cov hlau kauj tau ua cov txheej txheem ua ntej nruj, suav nrog degreasing thiab ua kom muaj tshuaj lom neeg. Degreasing tshem tawm cov roj saum npoo nrog cov tshuaj alkaline lossis cov kuab tshuaj, ua raws li los ntawm pickling kom tshem tawm cov hlau oxide nplai. Kev ntxuav dej thiab ziab kom huv si kom huv si. Qee cov txheej txheem kuj suav nrog electrolytic activation lossis passivation los txhim kho adhesion ntawm txheej thiab substrate.
Da dej Composition thiab Melting txheej txheem
Tus yuam sij rau txheej galvanized steel coils yog nyob rau hauv kev tsim da dej. Cov txheej txheem tseem ceeb siv ib qho txhuas-zinc-silicon ternary alloy system, feem ntau muaj 55% txhuas, 43.4% zinc, thiab 1.6% silicon (los ntawm huab hwm coj), hu ua Galvalume®. Qhov sib piv no yog thermodynamically optimized los tsim ib qhov ntom ntom Al₂O₃ oxide zaj duab xis ntawm qhov kub thiab txias thaum khaws cov cathodic tiv thaiv los ntawm zinc. Lub da dej kub yog tswj nyob rau hauv qhov ntau ntawm 600-650 degree. Qhov kub thiab txias heev yuav ua rau cov hlau sib cais, thaum qhov kub thiab txias yuav cuam tshuam rau txheej txheej fluidity.
Kub-Dip txheej thiab txias
Cov kauj hlau pretreated nkag mus rau hauv chav da dej ntawm qhov ceev ceev, qhov twg rab riam cua tswj cov txheej tuab (feem ntau 30-200 g / m²). Thaum lub sij hawm txheej txheej txheej, ib qho kev hloov pauv ntawm metallurgical tshwm sim nyob nruab nrab ntawm cov hlau substrate thiab cov molten alloy, tsim ib qho Fe-Al inhibition txheej ntawm qhov sib cuam tshuam los tiv thaiv kev sib kis ntau dhau thiab tsim cov theem nkig. Lub coated steel kauj yog ceev ceev los ntawm cua txias los yog dej pos huab quenching kom stabilize lub txheej txheej. Qee cov khoom siv high-end tau ua tiav tiav, siv cov menyuam calendering kom tshem tawm qhov tsis xws luag thiab kho roughness.
Ncej -Kev Ua Haujlwm thiab Kev Txhim Kho Kev Ua Haujlwm
Txhawm rau txhim kho tus ntiv tes tiv thaiv lossis txheej txheej sib raug zoo, qee qhov galvanized steel coils tau txais kev kho mob passivation (xws li chromate passivation) los yog coated nrog cov organic coatings. Nyob rau hauv xyoo tas los no, ib puag ncig tus phooj ywg chromium-cov thev naus laus zis pub dawb (xws li kev kho silane) tau dhau los ua neeg nyiam. Cov khoom kawg yog coiled ntawm ib lub winder thiab slit kom tau raws li ntau yam specifications.
Cov txheej txheem zoo thiab daim ntawv thov scenarios
Cov txheej tuab ntawm galvanized steel coils tuaj yeem ncav cuag 2-6 npaug ntawm cov xim zinc txheej. Nws cov corrosion kuj yog 2-4 npaug ntawm cov hlau ntshiab galvanized nyob rau hauv ib txwm atmospheric tej yam kev mob, ua tshwj xeeb tshaj yog haum rau cov ntug hiav txwv dej nrog siab ntsev pos huab los yog muaj kuab paug. Qhov sib ntxiv ntawm txhuas kuj tseem ua rau muaj kev kub ntxhov siab heev ({7}} qhov kub thiab txias ua haujlwm ntev txog 315℃), ua rau nws yog ib qho khoom siv zoo tshaj plaws rau qhov kub thiab txias xws li ru tsev kab hlau rhuav phab ntsa thiab qhov cub sab hauv.
Los ntawm kev tswj xyuas meej ntawm cov khoom sib xyaw thiab cov txheej txheem plating, galvanized steel coils ua tiav qhov sib npaug ntawm lub zog, kev tiv thaiv corrosion, thiab tus nqi -kev ua tau zoo, ua rau lawv yog ib qho khoom siv tseem ceeb hauv kev tsim khoom niaj hnub no.
