1.Dab tsi yog cov qauv kev xeem thiab cov kev xeem rau kev kuaj ntsev ntsev?
Test Standards:
Neutral Salt Spray Test: Txoj kev yooj yim tshaj plaws, ua raws li ASTM B117 / ISO 9227.
Acetic Acid Salt Spray Test: hnyav dua li nruab nrab ntsev tsuag, siv kom tau txais txiaj ntsig sai dua.
Copper-Kev Ntsuas Acetic Acid Salt Spray Test: Txawm tias hnyav dua, nrog lub sijhawm luv tshaj plaws.
Kev Xeem Xeem:
Kev daws: 5% sodium chloride tov.
Kub: Feem ntau khaws cia ntawm qhov ntsuas kub tsis tu ncua 35 degree.
Ib puag ncig: Hauv chav kaw, cov ntsev tov yog atomized los ntawm lub nozzle los tsim ib qho chaw diffuse ntsev.
Humidity: Kwv yees li 100% RH.
2.Dab tsi yog cov qauv kev xeem thiab cov kev xeem rau qhov ntsuas kub thiab av noo tas li?
Test Standard: ASTM D1748 / ISO 6270-2 (feem ntau hu ua "xeb tiv thaiv roj test," tab sis kuj muaj feem xyuam rau zinc coatings)
Kev Xeem Xeem:
Kub: Feem ntau teem ntawm 40℃± 2℃lossis 50℃± 2 degree.
Humidity: Tsis tu ncua khaws cia siab dua 95% RH, lossis txawm tias 100% RH.
Test Duration: Raws li qhov yuav tsum tau ua, qhov no tuaj yeem nyob ntawm kaum mus rau pua pua teev.
3.Dab tsi yog cov qauv kev xeem thiab cov kev xeem rau kev kuaj kev sib tsoo?
Cov qauv xeem: ISO 14993 / CCT-I, lossis cov qauv tsim tshwj xeeb ntawm cov tuam txhab loj (xws li GMW 14872, VW 50185).
Test lub voj voog piv txwv (ib lub voj voog 24-teev ib txwm):
Ntsev tsuag theem: Siv ntsev tsuag ntawm 35℃rau ib lub sij hawm (piv txwv li, 1 teev).
Qhuav theem: nce qhov kub ntawm 60℃thiab txo cov av noo (xws li, 30% RH) kom qhuav cov qauv saum npoo.
Cov cua sov ntub dej: Khaws qhov chaw muaj av noo ntawm 50℃thiab 95% RH.
Rov ua dua lub voj voog no.
4.Dab tsi yog cov txheej txheem kuaj thiab ntsuas ntsuas?
Kev npaj ua qauv:
Txiav ib qho piv txwv ntawm qhov loj me (xws li 150mm x 100mm) los ntawm galvanized kauj.
Kaw cov npoo ntawm cov qauv nrog daim kab xev los yog siv quav ciab los tiv thaiv corrosion los ntawm kev txiav ntug, uas tuaj yeem cuam tshuam nrog kev ntsuam xyuas ntawm thawj qhov chaw.
Ntxuav cov qauv saum npoo kom tshem tau cov roj lossis cov ntiv tes.
Qhov chaw:
Muab cov qauv tso rau ntawm ib lub kaum ntse ntse (piv txwv li, 15℃-30 degree) ntawm kev txhawb nqa hauv chav kuaj.
Test Duration:
Lub sijhawm kuaj tag nrho yog txiav txim siab raws li cov khoom tshwj xeeb lossis kev pom zoo nrog tus neeg siv khoom (xws li 24 teev, 48 teev, 72 teev, 96 teev, 200 teev, 500 teev, thiab lwm yam).
Kev ntsuam xyuas thiab kev sau cia:
Kev soj ntsuam macroscopic: tsis tu ncua saib thiab yees duab hloov pauv ntawm qhov chaw, tsom mus rau qhov tsos thiab kev loj hlob ntawm cov xim dawb thiab xim liab.
Quantitative Rating:
Corroded Area Percentage: Ntsuam xyuas thaj chaw uas muaj xeb.
Adhesion Poob: Tom qab kev sim, cov zinc txheej tuaj yeem raug tshuaj xyuas rau flaking siv txoj kab xev.
Kev hloov pauv hnyav: Rau kev tshawb fawb txog kev tshawb fawb lossis kev sib piv meej, qhov saum npoo yog qhov raug hnyav ua ntej thiab tom qab kuaj xyuas kom suav qhov poob phaus (zinc poob) lossis qhov hnyav nce (cov khoom tsim corrosion) hauv ib cheeb tsam.
5.Yuav txhais li cas rau qhov kev xeem?
Sijhawm rau xeb dawb: Qhov no qhia txog tus nqi corrosion ntawm zinc txheej nws tus kheej. Lub sijhawm ntev dua qhia tias cov zinc txheej ruaj khov dua thiab ua haujlwm zoo dua rau cov dej noo thiab cua sov. Qhov no yog ze ze rau lub zinc txheej purity, thickness, thiab seb nws puas tau passivated.
Unpassivated galvanized coils muaj lub sijhawm luv tshaj plaws rau xeb dawb.
Roj- txheej lossis chromium-dawb passivation tuaj yeem txuas lub sijhawm mus rau xeb dawb.
Chromate passivation (xim txheej / xim daj) yog qhov zoo tshaj plaws vim nws tsim cov yeeb yaj kiab tiv thaiv ntom ntom.
Lub sijhawm rau xeb liab: Qhov no qhia txog kev tiv thaiv lub neej ntawm zinc txheej ntawm cov hlau substrate. Qhov no yog qhov kawg thiab tseem ceeb tshaj plaws qhia, qhia txog zinc txheej thickness, uniformity, thiab corrosion tus nqi. Tom qab xeb liab tshwm, qhov ntev ntawm cov khoom siv tag nrho lub neej.