1.Dab tsi yog cov txheej txheem ntawm kev puas tsuaj rau xim -coated steel coils tshwm sim los ntawm qhov chaw kub thiab av noo?
Moisture Penetration thiab Accumululation: Tsav los ntawm tshav kub, dej molecules maj mam nkag los ntawm cov organic txheej. Yog tias txheej txheej muaj qhov tsis xws luag hauv microscopic lossis adhesion tsis zoo, noo noo yuav khaws cia ntawm txheej txheej - substrate interface.
Poob Adhesion (Core Damage): Accumulated noo noo tsis muaj zog cov tshuaj lom neeg daim ntawv cog lus ntawm lub txheej thiab lub substrate (los ntawm lub conversion zaj duab xis), ua rau kom adhesion tsawg. Qhov no yog qhov kev ntsuam xyuas tseem ceeb tshaj plaws hauv kev ntsuas cua sov.
Corrosion Initiation: Thaum noo noo mus txog cov hlau substrate thiab ua ke nrog cov pa oxygen, nws ua rau cov txheej txheem corrosion (rau zinc plating, qhov no ua rau "dawb xeb").
Blistering: Corrosion khoom los yog ya raws ntawm lub interface nthuav thaum rhuab, nqa cov txheej thiab tsim npuas pom. Qhov no yog ib qho kev tshwm sim ntawm qhov tsis zoo damp kub tsis kam.
Hydrolysis Reaction: Kub kub thiab av noo ua rau lub hydrolytic breakage ntawm molecular chains ntawm ib co coating resins (xws li polyester), ua rau coating chalking, poob ntawm gloss, thiab brittleness.
2.Yuav ntsuas kev tiv thaiv rau cov cua sov li cas?
Neutral Salt Spray Test: Thaum lub sij hawm feem ntau sim tiv thaiv cov ntsev tsuag corrosion, qhov kev ntsuam xyuas no kuj muaj nyob rau hauv qhov chaw ntub thiab kub thiab yog qhov kev sim tseem ceeb.
Hydraulic Cycling Test: Ib qho kev sim muaj tseeb thiab nruj dua. Cov cycles uas muaj xws li:
Kub kub thiab av noo siab: xws li 40℃± 2 degree, txheeb ze av noo ntau dua los yog sib npaug rau 95%, rau ntau pua mus rau txhiab teev.
Kev Ntsuas Dej Condensation: Xws li ISO 6270-2 (los yog GB / T 13893), nthuav tawm cov qauv mus rau ib puag ncig ntawm 40℃thiab 100% condensation av noo, xyuas ib ntus rau blistering, corrosion, thiab adhesion poob.
Boiled Water Test: Ib txoj kev ntsuam xyuas huab cua thiab nrawm, muab cov qauv tso rau hauv cov dej kub npau npau rau ob peb teev thiab saib seb cov txheej hlwv los yog tev tawm. Nws tuaj yeem tshuaj xyuas cov khoom tsis zoo nrog cov adhesion tsis zoo.
Kev lees txais: Tom qab kev sim, cov txheej yuav tsum tsis pub dawb ntawm blistering, corrosion, thiab tev, thiab qhov adhesion txo qis yuav tsum tsis pub tshaj qib 1 (feem ntau, qib 0-1 yog suav tias siv tau los ntawm kev sib tw hlais adhesion).
3.Yuav ua li cas cov txheej txheej resin cuam tshuam rau kev tiv thaiv kom ntub dej kub?
Qhov tseem ceeb tshaj plaws. Lub hydrolysis tsis kam ntawm cov resins sib txawv heev:
• PVDF (fluorocarbon): Qhov zoo tshaj plaws, ruaj khov molecular qauv, zoo heev hydrolysis tsis kam.
• HDP (siab- polyester durability) / SMP (silicone- hloov polyester): Zoo, zoo dua li cov qauv polyester.
• PE (tus qauv polyester): Feem ntau zoo, tej zaum yuav ua tsis tau thaum ntxov nyob rau hauv lub sij hawm ntev - hnyav thiab ntub dej.
4.Yuav ua li cas qhov zoo ntawm pretreatment cuam tshuam rau kev tiv thaiv rau damp cua sov?
Kev tiv thaiv yooj yim. Cov yeeb yaj kiab zoo tshaj plaws los hloov cov yeeb yaj kiab ua "cov nplaum muaj zog" thiab "xeb- tiv thaiv kev tiv thaiv" ntawm cov txheej txheej thiab cov hlau substrate, ua rau qeeb adhesion thiab corrosion los ntawm ya raws.
5.Yuav ua li cas txheej txheej thiab zaj duab xis thickness cuam tshuam rau kev tiv thaiv los nag?
Txheej Curing Degree: Cov txheej txheem kho tsis tau zoo yog qhov cuam tshuam rau dej nkag thiab puas.
• Zaj duab xis Thickness: Txaus tag nrho pem hauv ntej - sab txheej thickness (xws li, Ntau tshaj los yog sib npaug rau 20μm) zoo txuas rau cov dej nkag mus. Lub nraub qaum - sab txheej kuj tseem ceeb heev los tiv thaiv corrosion ntawm sab nraub qaum.