1.Qhov laj thawj tseem ceeb yog vim li cas peb tsis tuaj yeem vuam?
Xim coated yob sab:
Txheej kub hnyiab: Qhov kub ntawm qhov vuam arc (ntau tshaj qhov kev tiv thaiv ntawm cov txheej txheem) yuav hlawv cov xim tam sim ntawd -coated organic txheej (topcoat thiab primer) nyob ze ntawm qhov vuam, thiab tej zaum yuav ua kom puas "tshuaj hloov txheej" ntawm lub substrate (feem ntau yog ib daim ntawv galvanized). Qhov no yoojyim cov hlau substrate ncaj qha raug.
Galvanized coil sab:
Zinc txheej evaporation / oxidation: Lub melting point ntawm zinc yog hais txog 420 degree, thiab lub boiling point yog hais txog 907 degree, uas yog qis dua hlau. Qhov kub thiab txias ntawm vuam yuav evaporate thiab oxidize zinc txheej nyob ze ntawm lub vuam, tsim ntxeem tau thiab tsis tu ncua zinc oxide (dawb tshauv), poob nws qhov qub ntom thaiv kev tiv thaiv.
Ua tsis tiav ntawm sacrificial anode tiv thaiv: Lub hauv paus ntsiab lus tseem ceeb ntawm galvanized xeb tiv thaiv yog zinc ua raws li "sacrificial anode" rau corrode nyiam los tiv thaiv hlau. Vuam rhuav tshem qhov txuas ntxiv ntawm zinc txheej thiab cov hluav taws xob zoo sib txuas ntawm zinc thiab hlau, ua rau qhov kev tiv thaiv cathodic no txo qis lossis txawm tias tsis muaj txiaj ntsig hauv cheeb tsam weld.
Weld hlau nws tus kheej:
Cov khoom siv ntawm lub vuam pas nrig lossis vuam hlau feem ntau txawv ntawm cov hlau hauv paus. Cov tshuaj muaj pes tsawg leeg thiab cov qauv metallographic ntawm cov hlau vuam kuj txawv ntawm cov hlau hauv paus. Nws cov corrosion kuj yog nruab nrab nyob rau hauv lub xeev raug.
2.Dab tsi yog qhov tshwm sim tom qab vuam?
Accelerated electrochemical corrosion: Cov hlau raug (cathode), cov zinc txheej (anode) thiab cov hlau txuas ntxiv yuav tsim ib qho "tseem ceeb ntawm tes" nyob rau hauv ib qho chaw ntub dej, uas yuav ua rau kom qhov corrosion ntawm cov hlau raug (weld cheeb tsam).
Kev ntxhov siab ntau: Muaj cov kev ntxhov siab seem thiab muaj peev xwm ua kom pom qhov tsis xws luag hauv qhov vuam, uas yuav ua rau muaj kev cuam tshuam ntau dua thiab ua kom corrosion.
Xwb pib ntawm welds: Yog li ntawd, welded pob qij txha feem ntau yog thawj qhov chaw nyob rau hauv tag nrho cov qauv pib rusting, thiab qhov twg corrosion tsim sai tshaj plaws.
3.Qhov txheej txheem yog dab tsi?
Ncej -welding tu:
Ua tib zoo tshem cov vuam slag, spatter, zinc plua plav thiab oxides los ntawm vuam thiab tshav kub- thaj tsam cuam tshuam (li 20-50mm dav ntawm ob sab). Cov cuab yeej xws li txhuam hlau thiab lub kaum sab xis tuaj yeem siv tau.
Kev kho deg:
Xuab zeb qhov chaw ntxuav kom tshem tawm cov txheej xoob xoob thiab xeb, tsim kom muaj qhov huv si, ntxhib saum npoo kom muaj zog adhesion.
Siv cov tshuaj tiv thaiv tshwj xeeb - xeb primer:
Qhov no yog kauj ruam tseem ceeb tshaj plaws. Ib qho tshuaj tiv thaiv - xeb primer uas muaj zog tiv thaiv huab cua thiab adhesion zoo heev yuav tsum tau siv, xws li:
Epoxy zinc-nplua nuj primer: muab kev tiv thaiv cathodic thiab yog ib qho kev xaiv zoo tshaj plaws.
Epoxy primer: tsis tshua muaj zog adhesion thiab tiv taus tshuaj lom neeg.
Cov txheej yuav tsum npog tag nrho cov cheeb tsam cuam tshuam los ntawm kev puas tsuaj los ntawm tshav kub thiab nthuav tawm sab nraud kom tsim nyog.
4.Yuav ua li cas thov midcoat thiab topcoat?
Raws li kev xav tau ib puag ncig, siv cov xim nruab nrab (xws li epoxy mica hlau xim nruab nrab kom nce cov khoom thaiv thiab txheej tuab) ntawm cov primer.
Thaum kawg, siv cov huab cua- tiv taus topcoat (xws li acrylic polyurethane topcoat, fluorocarbon topcoat) uas phim cov xim thiab kev ua haujlwm ntawm cov xim -coated yob.
5.Dab tsi yuav tsum tau them nyiaj tshwj xeeb rau hauv ib puag ncig hnyav corrosive?
Txawm tias nrog cov saum toj no - tau hais txog ncej- ua tiav, qhov zoo, kev ncaj ncees, tuab thiab ntev - lub sij hawm tsis kam rau cov tshuaj corrosion ntawm tes- cov xim pleev xim yog nyob deb ntawm kev sib piv rau cov txheej txheem ua tiav los ntawm lub Hoobkas thawj.
Lub vuam yog ib txwm tsis muaj zog. Cov tshuaj lom neeg tsis sib haum xeeb, condensate thiab kub hloov pauv yuav nkag mus sai, ua rau cov txheej txheem tiv thaiv tsis ua haujlwm, ua rau lub vuam vuam thiab tej zaum yuav ua rau cov khoom xau.
Kev cob qhia kws tshaj lij:
Cov kev daws teeb meem uas xav tau: tsis txhob siv cov xim -coated coils, siv fiberglass reinforced yas (FRP), stainless hlau los yog yas-lined carbon steel ua cov khoom tseem ceeb, thiab siv cov flange ntsia liaj qhov rooj sib txuas los yog kev welding (xws li pickling thiab passivation tom qab stainless hlau vuam).
Kev xaiv thib ob: Yog tias nws yuav tsum tau siv, kev sib txuas ntawm cov khoom siv (xws li riveting, bolted kev sib txuas thiab sealant) yuav tsum tau siv los khaws cov kev ncaj ncees ntawm cov txheej qub rau qhov loj tshaj plaws. Cov pob qij txha yuav tsum tau muab khi nrog cov tshuaj lom neeg - tiv taus sealant.