Q: Dab tsi yog qhov laj thawj tseem ceeb rau kev ua kom tsis zoo thaum rov ua dua?
A: Lub hauv paus ua rau nyob rau hauv "kev sib kis" lossis "kev sib khi" ntawm cov txheej txheej qub, tiv thaiv cov xim tshiab thiab qub ntawm cov yeeb yaj kiab los ntawm kev sib raug zoo.
Nto "kev cais zaj duab xis": Tom qab lub sij hawm ntev - raug, qhov saum npoo ntawm lub pre-coated coil accumulates roj, plua plav, muaj kab mob, thiab txawm hmoov residue los ntawm aging coatings. Tsis tas li ntawd, xeb- tiv thaiv cov roj los yog cov txheej txheem passivation tam sim no ntawm lub Hoobkas tuaj yeem cuam tshuam qhov adhesion.
Overly du nto: Lub npoo du ntawm cov txheej qub tsis muaj qhov microscopic roughness uas tso cai rau cov xim tshiab rau "suav," ib txwm ua rau txo qis adhesion.
Txheej kev laus: Tom qab ntev- raug rau lub hnub thiab los nag, lub zog thiab cov qauv tshuaj ntawm cov txheej txheej qub tau hloov pauv. Yog tias tsis kho thaum lub sij hawm recoating, delamination yuav tshwm sim.
Q: Cov kauj ruam twg tuaj yeem ua tau los txhim kho adhesion ua ntej thov?
A: Ua ntej daim ntawv thov, qhov saum npoo yuav tsum tau muab ntxuav kom huv thiab roughened los tsim kom muaj kev sib txuas lus zoo.
Kev ntxuav tob tob: Ua ntej, siv lub siab - rab phom dej siab nrog cov tshuaj ntxuav tes kom tshem tawm cov plua plav, roj, thiab lwm yam khoom paug tawm ntawm qhov chaw, ua kom huv si.
Surface Sanding: Tom qab ntxuav thiab ziab, siv cov ntawv xuab zeb los yog lub tshuab sandblasting kom sib npaug ntawm cov txheej qub kom tshem tawm cov laus txheej thiab tsim ib qho tshiab, roughened nto.
Kev Kho Tshuaj: Tom qab xuab zeb, cov tshuaj phosphating lossis silane kho tus neeg sawv cev tuaj yeem siv rau kev kho tshuaj. Qhov no tsim ib zaj duab xis hloov dua siab tshiab rau ntawm qhov chaw uas tuaj yeem sib txuas nrog ob qho tib si qub thiab tshiab txheej, ntxiv kev txhim kho adhesion.
Q: Dab tsi yog qee cov lus qhia rau kev xaiv cov xim zoo nkauj?
A: Xaiv cov xim zoo yog qhov tseem ceeb rau kev ua kom zoo dua qub, thiab nws yog ib qho tseem ceeb los xyuas kom meej cov tshuaj sib raug zoo ntawm cov txheej qub thiab tshiab.
** Siv cov xim zoo nkauj, sib xws: ** Xaiv cov xim tshwj xeeb tsim rau cov khoom siv galvanized, xws li epoxy zinc daj primer lossis phosphate primer. Cov xim no muaj cov pab pawg ua haujlwm tshwj xeeb uas tsim cov tshuaj lom neeg muaj zog nrog ob txheej txheej galvanized thiab txheej txheej qub.
** Sib piv cov xim pleev xim: **
** Muaj zog adhesion: ** Cov xim nws tus kheej yuav tsum muaj adhesion zoo heev.
** Huab cua tsis zoo: ** Ua kom cov txheej txheej rov qab tuaj yeem tiv taus ntev - lub sij hawm raug cua thiab hnub.
**Low surface tension:** The surface tension of the chosen repair paint should be lower than that of the old coating to allow for thorough wetting, penetration, and a strong bond.
**Kev tsim tshwj xeeb:** High- cov xim kho kom zoo feem ntau muaj cov kuab tshuaj uas o cov txheej qub los yog pawg polar uas tsim cov ntawv cog lus hydrogen, yog li txhim kho interlayer adhesion.
Q: Yuav ua li cas adhesion kuaj thiab txiav txim?
A: Cov txheej txheem feem ntau yog "cross-txiav xeem," uas ntsuas ntau qib adhesion.
Test Method: Siv tus ntoo khaub lig- txiav tester los kos ib daim phiaj (feem ntau yog 25 squares) ntawm txheej txheej. Tom qab ntawd, siv daim kab xev tshwj xeeb thiab rub tawm sai sai. Qib yog txiav txim siab los ntawm thaj tsam ntawm txheej txheej txheej hauv txhua square.
Qib Standard: Kev lag luam feem ntau siv tus qauv 0-5 lossis 0B-5B, qhov twg 0 los yog 5B yog qhov zoo tshaj plaws (tsis muaj tev), thiab 5 los yog 0B yog qhov phem tshaj (tshuaj tawv heev).
Cov Kev Xav Tau Qib: Rau cov ntawv thov xws li recoating, kev lag luam feem ntau xav tau qib adhesion tsawg kawg yog 3B lossis, nruj dua, 0, kom ntseeg tau tias daim ntawv thov zoo.
Q: Cov kev cai ib puag ncig rau kev thov yog dab tsi?
A: Ib puag ncig tsim nyog yog qhov tseem ceeb rau kev kho kom zoo ntawm txheej txheej. Qhov kub thiab txias ntau dhau, qhov kub tsis txias, lossis cov av noo siab tuaj yeem ua rau tsis ua haujlwm.
Kub: Qhov pom zoo ambient kub rau daim ntawv thov yog nruab nrab ntawm 5℃thiab 35 degree.
Humidity: Tus txheeb ze av noo yuav tsum qis dua 75%. Tsis txhob siv rau hauv cov dej nag lossis pos huab.
Daim ntawv thov txheej txheem: Thaum recoating, siv lub hauv paus ntsiab lus ntawm "cov tsho nyias nyias, ntau lub tsho tiv no," tso cai rau lub sijhawm ziab kom txaus ntawm txhua lub tsho tiv thaiv kom tsis txhob tawg lossis tsis tiav vim yog cov txheej txheej tuab heev.