1.Vim li cas cov adhesion yuav zoo dua?
Qhov zoo tshaj plaws, sandblasting kom huv si tshem tawm tag nrho cov hnub nyoog, chalking qub coatings thiab cov kab mob, tsim kom muaj ib tug zoo meej roughness (txheej txheem thauj tog rau nkoj) ntawm galvanized txheej los yog steel substrate nto. Qhov no muab thaj chaw loj heev thiab cov ntsiab lus sib txuas rau cov txheej txheem tshiab, tso cai rau kev ua kom adhesion (feem ntau yog kuaj los ntawm kev rub- tawm txoj kev) kom yooj yim mus txog 10 MPa, deb tshaj qhov kev cai dav dav (piv txwv li, Ntau dua lossis sib npaug li 5 MPa).
Hauv qhov sib piv, cov xim qub-coated coil txheej yog siv los ntawm cov txheej txheem galvanized passivation, uas feem ntau yog siv rau cov khoom siv tshuaj lom neeg thiab cov rog intermolecular. Sandblasting ua raws li los ntawm recoating ntxiv ib tug muaj zog mechanical anchoring quab yuam.
2.Qhov kev ntsuam xyuas thiab kev npaj ua ntej sandblasting yog dab tsi?
Txheeb xyuas qhov xwm txheej ntawm cov txheej txheem qub: Tshawb xyuas qhov kev laus ntawm cov txheej txheem qub (chalking, tev, qhov ntau ntawm xeb). Qhov no txiav txim siab qib sandblasting.
Txiav txim siab qib kev huv: Rau kev rov ua dua, qib ISO Sa 2.5 (ze -dawb) feem ntau yuav tsum tau. Qhov no txhais tau tias qhov chaw yuav tsum tsis pub pom cov roj, roj, av, nplai, xeb, xim, thiab txawv teb chaws; txhua qhov seem yuav tsum tsuas yog me ntsis me ntsis los yog streaks.
Xaiv qhov tsim nyog abrasive:
Contraindicated: Quartz xuab zeb (tsim silica plua plav, tsim kev puas tsuaj rau kev noj qab haus huv), kev txhaj tshuaj steel (yuam kev puas tsuaj rau txheej galvanized).
Pom zoo:
Cam khwb cia hlau txhaj tshuaj / steel grit (me me particle loj): siab hardness, high efficiency, thiab tswj kev puas tsuaj rau lub galvanized txheej.
Tsis yog-hlau abrasives (piv txwv li, alumina, garnet xuab zeb, yas abrasive): Tsawg puas rau lub substrate, hmoov av tsawg, tshwj xeeb tshaj yog haum rau cov ntawv thov uas ntau dhau thinning ntawm galvanized txheej yog ib qho kev txhawj xeeb.
Mixed abrasives: Kom ua tau zoo zoo huv si thiab roughness.
3.Yuav tswj cov tub ntxhais ntawm cov txheej txheem sandblasting li cas?
Roughness tswj: Qhov no yog ib qho tseem ceeb rau adhesion. Lub hom phiaj roughness Rx (Ry) yog feem ntau ntawm 30-70 micrometers. ntiav dhau (<20μm) results in poor anchoring; too deep (>80μm) ua rau cov txheej galvanized ntau dhau thiab yuav tsum tau pleev xim ntau ntxiv los sau cov ncov, uas yuav ua rau cov txheej txheem ntxov ntxov.
Tsis txhob dhau- blasting: Tsis txhob tshem tawm cov txheej txheem galvanized kom nthuav tawm cov phaj hlau. Kev nthuav tawm cov phaj hlau yuav tsim cov khoom siv hluav taws xob hluav taws xob hluav taws xob (cov phaj hlau ua raws li cov anode, accelerating corrosion). Qhov saum npoo tom qab blasting yuav tsum muaj cov nyiaj zoo ib yam - grey metallic luster (los ntawm txheej galvanized).
Kev huv huv: Qhov saum npoo yuav tsum tsis muaj hmoov av thiab abrasive residue tom qab blasting.
4.Yuav xaiv thiab siv txheej txheej li cas?
Kev xaiv primer: Ib qho primer sib haum nrog galvanized nto thiab muaj zog adhesion yuav tsum tau xaiv.
Nyiam: Epoxy zinc-nplua nuj primer lossis epoxy primer. Epoxy resins pom zoo ntub adhesion thiab corrosion tsis kam rau hlau.
Txwv tsis pub nruj: Alkyd xim, cov roj zoo tib yam- cov xim pleev xim, thiab lwm yam, vim lawv yuav raug cov tshuaj tiv thaiv saponification nrog zinc, ua rau txheej txheej txheej.
Txheej Compatibility: Ua raws li "primer-intermediate-topcoat" txoj hauv kev sib raug. Tag nrho cov zaj duab xis qhuav thickness ntawm lub recoating system yuav tsum tsis txhob tsawg tshaj li cov thawj txheej thickness, los yog yuav tsum tau tsim raws li corrosive ib puag ncig.
Daim Ntawv Thov Ib puag ncig: Kub thiab av noo yuav tsum ua tau raws li cov txheej txheem txheej txheem kom ntseeg tau tias kev kho kom zoo ntawm txheej txheej.
5.Dab tsi yog qhov txaus ntshai thiab feem ntau ua rau ua tsis tiav?
Kev npaj tsis tiav: Cov txheej qub qub, nplai, lossis tsis pom cov kab mob tseem nyob.
Kev huv tsis txaus: Cov plua plav lossis ntsev tseem nyob ntawm qhov chaw, tsim cov txheej tiv thaiv hauv qab txheej.
Tshaj -blasting/exposed hlau: Qhov no ua rau cov txheej txheem tiv thaiv galvanized txuas ntxiv, tsim kom muaj kev tiv thaiv corrosion; lub txheej yuav tev tawm ntawm xeb me ntsis.
Kev xaiv primer tsis raug: Cov xim tsis sib haum nrog cov txheej galvanized tau siv.
Ntau lub sijhawm nruab nrab ntawm daim ntawv thov: Ib qho xoob oxide zaj duab xis lossis cov ntaub ntawv xeb dawb ntawm qhov chaw tom qab blasting.