Galvalume steel coil yog siab -kev ua tau zoo corrosion- cov khoom tiv taus tsim los ntawm txheej txheej steel substrate nrog aluminium-zinc alloy los ntawm txheej txheem kho saum npoo. Nws zoo heev corrosion kuj yog feem ntau yog vim muaj tshuaj lom neeg thiab lub cev barrier nyhuv ntawm aluminium-zinc alloy txheej. Nws txoj hauv kev ua haujlwm suav nrog kev tiv thaiv hluav taws xob, tsim cov yeeb yaj kiab tiv thaiv ntom ntom los ntawm kev kub siab oxidation, thiab kev sib koom ua ke ntawm aluminium-zinc alloy.
I. Basic Structure thiab Txheej Txheej ntawm Galvalume Steel Chev
Cov txheej txheem tseem ceeb ntawm galvalume steel kauj muaj cov hlau me me substrate coated nrog aluminium-zinc alloy txheej. Cov txheej txheem txheej txheem yog 55% txhuas, 43.4% zinc, thiab 1.6% silicon (Galvalume® alloy). Qhov kev sib piv no yog optimized los tsim ib txheej tiv thaiv ruaj khov ntawm qhov kub thiab txias. Cov txhuas hauv txheej feem ntau muab cov tshuaj tiv thaiv antioxidant thiab thermal rwb thaiv tsev, thaum zinc tiv thaiv cov hlau substrate los ntawm corrosion los ntawm electrochemical sacrificial anodic mechanism.
II. Electrochemical Protection Mechanism
Thaum aluminium-zinc-coated steel coils raug rau ib puag ncig corrosive, zinc, cov hlau reactive ntau dua hlau, nyiam dua oxidation, tsim zinc ntsev (xws li ZnO thiab Zn (OH)₂), yog li tiv thaiv corrosion ncaj qha ntawm cov hlau substrate. Cov txheej txheem no hu ua cathodic tiv thaiv. Txawm hais tias cov txheej txheej yog ib feem puas, cov txheej txheem ntawm cov hlau nplaum tseem tiv thaiv los ntawm ib puag ncig zinc txheej kom txog thaum zinc tau noj tag. Nyob rau hauv sib piv, cov zinc txheej ntshiab (xws li galvanized steel) muaj kev tiv thaiv cathodic muaj zog tab sis tsis tshua muaj kev tiv thaiv rau siab - kub thiab atmospheric corrosion. Aluminium-zinc alloys muab kev tiv thaiv kev tiv thaiv ntawm zinc nrog kev tiv thaiv kev tiv thaiv ntawm txhuas, ntxiv dag zog rau kev tiv thaiv corrosion tag nrho.
III. Aluminium's Barrier Effect thiab High -Kev Tiv Thaiv Kub Oxidation
Aluminium tsim ib ntom aluminium oxide (Al₂O₃) zaj duab xis nyob rau hauv lub txheej. Cov oxide no tsis tshua muaj tshuaj lom neeg ruaj khov, zoo thaiv cov pa oxygen, noo noo, thiab corrosive media los ntawm steel substrate. Nyob rau hauv siab - qhov kub thiab txias (xws li cov pa taws los yog lub hnub ci ncaj qha), aluminium nyiam ua rau cov pa oxygen, tsim cov txheej tiv thaiv aluminium oxide rau ntawm txheej txheej, tiv thaiv oxidation ntxiv ntawm cov zinc thiab steel substrate. Cov cuab yeej no ua rau galvanized steel coils zoo heev rau siab -kev siv kub xws li vov tsev, chimneys, thiab qhov cub casings.
IV. Tus kheej -Tshuaj Txheej thiab Ntev- Lub Sij Hawm Ua Si
Txawm hais tias thawj txheej txheej ntawm galvanized steel coils muaj kev tiv thaiv zoo ib yam, hauv kev siv tiag tiag, khawb lossis puas tuaj yeem nthuav tawm cov hlau substrate hauv thaj chaw. Hauv cov xwm txheej no, kev tiv thaiv kev txi ntawm zinc tseem ua rau cov txheej txheem corrosion, thaum cov txheej txheem txhuas oxide maj mam diffuses rau hauv qhov chaw puas, tsim cov yeeb yaj kiab tiv thaiv theem nrab. Tsis tas li ntawd, qhov corrosion kuj ntawm galvanized steel coils txhim kho lub sij hawm, tshwj xeeb tshaj yog nyob rau hauv marine climates los yog industrially polluted ib puag ncig, qhov twg lawv lifespan feem ntau yog 2-6 zaug ntev dua li cov pa galvanized steel coils.
V. Kev cuam tshuam ntawm daim ntawv thov ib puag ncig ntawm kev ua haujlwm ntawm Galvalume Steel Chev
Kev tiv thaiv zoo ntawm galvalume steel kauj yog cuam tshuam los ntawm ib puag ncig, xws li:
•Acidic lossis alkaline ib puag ncig: siab lossis pH ib puag ncig yuav ua rau kom tawg ntawm zinc thiab txhuas, xav tau txheej txheej thickness (feem ntau 30-300 g / m²) raws li cov kev ua haujlwm tshwj xeeb.
•Chloride ib puag ncig (xws li cov chaw ntug dej hiav txwv): Chloride ions yooj yim rhuav tshem cov oxide zaj duab xis, tab sis cov nyhuv synergistic ntawm aluminium-zinc alloy tseem muaj txiaj ntsig zoo dua rau ib qho - hlau txheej.
•High-kub, qhov chaw qhuav: Kev tsim cov yeeb yaj kiab aluminium oxide ua rau cov galvalume steel coils kom muaj kev ruaj ntseg txawm tias qhov kub thiab txias.
Xaus
Galvalume steel coils ua tau zoo heev corrosion kuj los ntawm kev tiv thaiv electrochemical muab los ntawm txhuas -zinc alloy txheej, aluminium oxide barrier nyhuv, thiab siab - kub stability. Nws txoj kev khiav hauj lwm tsis yog tsuas yog nyob rau ntawm kev tiv thaiv anodic tiv thaiv zinc nkaus xwb tab sis kuj nyob rau hauv siab -kub oxidation tsis kam ntawm txhuas, ua rau nws yog ib qho kev xaiv rau cov tsoos galvanized steel hauv ntau daim ntawv thov kev lag luam. Kev xaiv tsim nyog ntawm txheej tuab thiab kev kho saum npoo tuaj yeem ua kom zoo dua nws lub neej kev pabcuam hauv ib puag ncig tshwj xeeb.
