1.What yog qhov tseem ceeb lav ntawm huab cua tsis kam?
Galvanized Txheej: Ua haujlwm ua txheej txheem tiv thaiv txheej, tiv thaiv cov ntawv hlau los ntawm kev ua kom huv los ntawm kev ua kom zoo ntawm zinc. Nws cov thickness ncaj qha cuam tshuam cov corrosion tsis kam ntawm lub hauv paus txheej (piv txwv li zinc txheej hnyav li ntawm 80-275g / m², nyob ntawm ntug kev corrosive).
Kev siv tshuaj lom neeg hloov tus txheej txheem txheej txheem (piv txwv li cov txheej txheem passive): txhim kho cov nplaum ntawm galvanized txheej thiab tus thawj coj, thaum txuas ntxiv cov dej noo thiab cov pa oxygen ntxiv.
Primer: feem ntau epoxy lossis polyester, nws bonds nruj nreem rau lub galvanized txheej, muab kev tiv thaiv corrosion, thiab yog qhov tseem ceeb rau kev sib txuas rau lub topcoat.
Topcoat: Raug rau ntawm ib puag ncig, nws yuav tsum tau nthuav tawm rau UV Kev Laus, Acid thiab Alkali, thiab kev tawm tsam. Hom Hom muaj xws li polyester, hloov polyester (SMP), thiab polyvinylidene fluoride (PVDF, pleev tshuaj pleev fluorocarbon). PVDF Topcoats muaj cov huab cua zoo tshaj plaws.
2.Qhov dab tsi yog qhov sib txawv ntawm huab cua tsis kam ua rau sib txawv?
Ib puag ncig atmospheric ib puag ncig (nroog loj thiab nyob deb nroog)
Haum rau kev ua tsev sab nraud, ru tsev, cov cuab yeej cuab tam, thiab lwm yam kev siv. ◦ Polyester Topcoat: Feem ntau lees paub 5-10 xyoo ntawm txheej kev ncaj ncees nrog tsis muaj kev ua yeeb yam lossis tshem tawm. ◦ Silicone-hloov polyester (SMP): Muaj huab cua zoo dua piv rau cov qauv txheem txheem, tswj cov khoom ruaj khov thiab ua tau zoo rau 10-15 xyoos. ◦ PVDF Topcoat: Tshwj xeeb huab cua-tiv taus, nrog lub neej pabcuam ntawm ntau tshaj 20 xyoo hauv qhov chaw qhuav, nrog tsis muaj kev chim siab lossis tsis muaj kev sib deev.
Cov chaw hnyav (chaw ntug dej hiav txwv, chaw muaj av noo) ◦ cream ions hauv cov ntsev ua kom nrawm dua cov laus thiab plating corrosion. PVDF Topcoat, nrog nws cov tshuaj muaj zog huv, tiv taus ntsev tsuag tshuaj yaig. Ua ke nrog cov tuab zinc txheej (piv txwv li, 275g / m² / m²), nws tuaj yeem ua ntej 15-20 xyoo nyob rau hauv ntug hiav txwv. Txheem Polyester Topcoats tej zaum yuav muaj kev npau taws thiab xeb nyob rau hauv xws li ib puag ncig tom qab 3-5 xyoos. ◦ Kev lag luam thaj chaw (muaj cov sulphur dioxide thiab hmoov av): acidic kuab paug tuaj yeem corating txheej. SMP lossis PVDF Topcoats tuaj yeem txo tus nqi ntawm corrosion los ntawm lawv cov kua qaub thiab alkali tsis zoo, thaum cov polyesters zoo li qub tau pleev xim. ◦ Cov chaw noo noo (xws li cov nag yav qab teb thaj chaw tau yooj yim coj los ua kom muaj cov txheej av noo noo ntawm cov txheej thiab lub substrate. Cov primers zoo (xws li Epoxy Primers) tuaj yeem thaiv cov dej num epoxy) tuaj yeem thaiv cov dej noo thiab, txo cov kev pheej hmoo ntawm blistering thiab tev.
3.Qhov twg yog cov huab cua tsis kam ntsuas thiab kuaj cov qauv kev sim?
Cov txau ntsev ua kom tsis kam: PVDF txheej txheem feem ntau yuav dhau ntawm cov ntsev li ntau dua 5,000 teev, raws li GB / T 13448 lossis ASTM B117. Lawv tsis muaj xeb lossis cem; Nruab nrab polyester feem ntau kav rau 1,000-2,000 teev.
Accelerated weathering (QUV) testing: simulating the aging effects of ultraviolet light and thermal cycling on coatings, according to ASTM G53, shows that after 3,000 hours, PVDF coatings typically exhibit a color difference (ΔE) of less than 3 and a chalking rating of >4 (tsis muaj kev daig caj pas). Lub tsev kawm ntawv dog dig tuaj yeem ua rau pom kev tsis pom thiab tshem tawm tom qab 2,000 teev.
Kev ya raws thiab kub ua kom tsis kam: thaum kuaj qhov kub thiab txias ib puag ncig (piv txwv li cov lej rh) Acid thiab alkali tsis kam: resistant rau acid los nag los yog muaj kua qaub thiab alkali corrosion. Tom qab PVDF Topcoat yog raus hauv kev daws teeb meem nrog lub pH ntawm 3-11, cov xim pleev xim tsis muaj kev puas tsuaj.
4.Qhov qhov tseem ceeb twg cuam tshuam rau huab cua tiv thaiv?
Cov khoom siv txheej: Topcoat hom yog qhov tseem ceeb: PVDF (Fluorine cov ntsiab lus ntau dua lossis sib npaug rau 70%)> SMP> PIB COLYESTER. Kev sib xyaw ntawm Primer thiab Topcoat kuj tseem ceeb (piv txwv li Epoxy Primer + PVDF Topcoat kev sib xyaw ua ke muaj huab cua zoo dua).
Txheej Txheej: Topcoat Thickness feem ntau yuav tsum muaj ntau dua los yog sib npaug rau 20 μm; thinner tuab tuaj yeem ua rau muaj kev laus laus. Primer tuab yuav tsum muaj ntau dua los yog sib npaug rau 5 μm kom ntseeg tau cov nplaum rau txheej.
Cov Txheej Txheem Ntau Lawm: Kev tswj tsis raug cai ntawm cov txheej txheem kub thiab sijhawm tuaj yeem ua rau cov kab lis kev cai tsis txaus ntawm cov yeeb yaj kiab, txo cov huab cua tsis kam. Tsis tiav saum npoo pretreatment (xws li passivation ntawm cov galvanized txheej) muaj peev xwm cuam tshuam txheej nplaum thiab ua kom nrawm dua qub.
Kev Txij Nkawm: Ntev ua kom muaj plua plav ntawm cov plua plav thiab roj yuav ua kom muaj kev laus txheej. Kev tu tsis tu ncua tuaj yeem txuas lub neej pabcuam ntxiv. Txooj khawb ntawm txheej thaum lub sijhawm teeb tsa uas tsis tau kho kom sai tuaj yeem dhau los ua kev pib ua xeb thiab txo cov huab cua tiv thaiv tag nrho.
5.Qhov dab tsi sib txawv ntawm huab cua tsis kam ntawm cov xim-coated galvanized chev thiab zoo nkauj galvanized coil?
Nruab nrab polyester xim-coated chev yog qhov haum rau qhuav, cov chaw pabcuam qis thiab muaj lub neej pabcuam ntawm 5-10 xyoo.
SMP xim-txheej kauj yog tsim nyog rau kev muaj teeb meem ib puag ncig thiab muaj lub neej pabcuam ntawm 10-15 xyoo.
PVDF Cov xim coil yog qhov kev xaiv siab kawg, muab cov kev pabcuam ruaj khov rau 15-25 xyoos rau ib puag ncig cov ntug hiav txwv thiab chaw muaj kev muaj chaw. Nws yog qhov kev xaiv xaiv tau mus ntev sab nraum zoov hauv tsev sab nrauv phab ntsa thiab cov ru tsev.