1.Vim li cas cov txheej txheem passivation cuam tshuam rau adhesion?
Tsis tshua muaj zog nto thiab inert nto: Passivation khaubncaws sab nraud povtseg (tshwj xeeb tshaj yog chromate passivation khaubncaws sab nraud povtseg) yog heev ruaj khov, ntom, thiab chemically inert. Qhov no txhais tau hais tias resin molecules nyob rau hauv cov xim muaj teeb meem tsim muaj zog tshuaj bonds los yog lub cev anchoring nrog lawv, ua rau yooj yim "pinholes" thiab xim tev.
Nthuav du nto: Passivated galvanized nto feem ntau yog du, tsis muaj roughness rau xim rau "suav," ua rau lub cev tsis muaj zog adhesion.
Brittleness: Qee hom txheej txheej passivation yog inherently nkig thiab tej zaum yuav tsim microcracks thaum lub sij hawm ua cov ntawv hlau (xws li khoov), ua rau cov xim tev tawm nrog rau cov kab nrib pleb.
2.Yuav ua li cas xaiv hom passivation tsim nyog rau txheej?
Chromium-dawb passivation: Ntau yam niaj hnub chromium-cov thev naus laus zis pub dawb (xws li silane, zirconium-raws li, thiab titanium-raws li kev kho mob) tau tsim tshwj xeeb los txhim kho cov xim sib xws. Lawv muab cov chaw sib txuas tshuaj lom neeg ntau dua rau cov xim los ntawm kev tsim cov hydroxyl-nplua nuj zaj duab xis rau saum npoo, feem ntau ua rau adhesion zoo dua li cov tsoos chromate passivation.
Dedicated passivation: Qee cov kev kho mob passivation tshwj xeeb yog tsim los rau cov txheej txheem tom ntej, nrog kev txhim kho adhesion twb tau txiav txim siab hauv kev tsim.
3.Yuav ua li cas ua tau zoo nto pretreatment?
Ntxuav thiab Degreasing: Cov tshuaj ntxuav kom zoo yuav tsum tau siv kom huv si tshem cov roj, plua plav, thiab cov ntiv tes tawm ntawm qhov chaw. Qhov no yog lub hauv paus ntawm txhua kauj ruam.
Surface Conversion (Core for Improved Adhesion):
Phosphating: Qhov no yog ib txoj hauv kev zoo tshaj plaws thiab siv tau zoo. Ib zaj duab xis phosphate (xws li zinc phosphate zaj duab xis) yog tsim nyob rau sab saum toj ntawm cov txheej txheem passivation. Cov phosphate zaj duab xis no muaj cov qauv microporous, muab cov xim pleev xim nrog thaj chaw loj thiab muaj zog txhua yam kev sib tsoo, ua rau muaj kev sib txhuam zoo heev.
Nano-Ceramic Treatment/Silane Treatment: Cov thev naus laus zis kho tshiab no tuaj yeem tsim cov qauv nanoscale network, txhim kho kev ua haujlwm ntawm qhov chaw thiab tshuaj lom neeg nrog cov xim.
4.Yuav ua li cas xaiv ib qho tshwj xeeb primer rau txheej?
Epoxy zinc-nplua nuj primer los yog epoxy zinc phosphate primer: Cov primers muaj cov khoom uas cuam tshuam nrog zinc nto, ua rau muaj zog adhesion thiab zoo corrosion kuj.
Ob -cov khoom siv epoxy primer: Muab cov adhesion zoo rau ntau qhov chaw.
Tsis txhob siv cov txheej txheem acidic xws li alkyds, vim tias lawv yuav dhau los ua cov tshuaj tiv thaiv saponification nrog zinc, ua rau blistering thiab tev ntawm txheej.
5.Dab tsi yog qee txoj hauv kev los ntsuas qhov adhesion?
Siv cov cuab yeej tshwj xeeb kom tau qhab nia tus qauv ntoo khaub lig ntawm cov xim zaj duab xis.
Siv daim nplaum tshwj xeeb thiab sai sai tshem tawm.
Saib seb cov xim pleev xim ntau npaum li cas tawm ntawm cov npoo ntawm daim phiaj. Kev ntsuam xyuas siab dua (piv txwv li, 0 lossis 5B) qhia tau tias muaj kev nplaum zoo dua.