Vim li cas Steel Pipes xav tau txheej txheej?
Cov yeeb nkab steel corrodes thaum nws tiv nrog dej, oxygen thiab aggressive av los yog txheej txheem xov xwm. Coatings cais cov hlau los ntawm ib puag ncig, thiab rau cov faus los yog cov kav dej hauv qab lawv ua haujlwm ua ke nrog kev tiv thaiv cathodic: cov txheej txheem ua haujlwm feem ntau ntawm corrosion load thaum lub cathodic system tiv thaiv cov cheeb tsam me me uas cov txheej txheem puas. Lub qhov dej zoo - xaiv txheej txheej yog li ntawd yog ib qho ntawm cov nqi ntau tshaj - txoj hauv kev zoo los txuas lub neej kav dej.
Cov txheej txheem txheej muab faib ua ob tsev neeg: tsis yog- txheej txheej hlau thiab txheej hlau. Nyob rau hauv txhua tsev neeg qhov kev xaiv nyob ntawm qhov nruab nrab (kub, pH, corrosivity), qhov chaw tsim kho (av av resistivity, humidity, dej rooj), kev txwv nyiaj txiag thiab kev pab cuam lub neej.
Tsis yog -Hloov Txheej Hom
| Txheej | Nws ua haujlwm li cas | Zoo tshaj rau | txwv |
|---|---|---|---|
| Fusion-Teb chaws Epoxy (FBE) | Electrostatic hmoov txau, kho ntawm qhov kub thiab txias rau hauv ib qho nyuaj, nplaum nplaum heev | Roj thiab roj pipelines, kab dej; tshuaj tiv thaiv zoo heev | Kev cuam tshuam tsis zoo; ib leeg - txheej FBE xav tau kev saib xyuas hauv cov pob zeb rov qab |
| Peb- Txheej Polyethylene (3LPE) | Epoxy primer + nplaum txheej + polyethylene topcoat | Cov kav dej faus, tus qauv rau loj - txoj kab uas hla | Tus nqi siab dua; yuav tsum tau huv, qhuav nto npaj |
| Polyurethane (PU) | Elastic, hnav- thiab cuam tshuam- tiv taus txheej | Abrasive ib puag ncig, kev tiv thaiv sab nraud ntawm cov kav dej insulated | Cov dej noo-sensitive thaum siv |
| Coal -Tar Epoxy | Tsawg-tus nqi epoxy nrog cov thee-tar reinforcement | Nruab nrab- thiab qis- cov kav dej siab, ib puag ncig corrosive me | Tsawg kub thiab tshuaj muaj peev xwm tshaj FBE / 3LPE |
FBE yog siv los ntawm cua sov cov yeeb nkab mus rau ib ncig ntawm 220 mus rau 250 C thiab txau epoxy hmoov electrostatically; cov hmoov melts, ntws thiab kho rau hauv ib zaj duab xis tas li. Peb- txheej polyethylene ntxiv cov nplaum nruab nrab- txheej thiab polyethylene txheej txheej hla FBE, sib txuas cov adhesion ntawm epoxy nrog cov neeg kho tshuab kev tiv thaiv ntawm polyethylene - uas yog vim li cas 3LPE tau piav raws li tus qauv kub rau faus cov kav dej. Polyurethane raug xaiv qhov twg cov txheej yuav tsum flex nrog cov yeeb nkab thiab muaj sia nyob kev tsim txom, thiab cov thee - tar epoxy tseem yog tus neeg ua haujlwm uas tus nqi yog qhov txiav txim siab.
Hlau Txheej
Kub-dip galvanizing yog cov txheej txheem hlau ntau tshaj plaws: cov yeeb nkab steel yog ntxuav, fluxed thiab muab tso rau hauv zinc molten, ua ib qho metallurgically bonded zinc- hlau alloy txheej. Zinc corrodes nyiam rau cov hlau, yog li txheej txheej muab kev tiv thaiv kev txi (cathodic) ntawm khawb thiab txiav xaus. Galvanized yeeb nkab yog tus qauv tsim cov yeeb nkab, scaffolding, tes tuav thiab hluav taws kub - cov kab hluav taws xob tiv thaiv.
Cov Txheej Txheem Tshwj Xeeb
Rau cov xwm txheej hnyav, cov kev xaiv tshwm sim muaj xws li cov txheej txheem ceramic thiab cov txheej txheem polymer sib xyaw uas tiv taus qhov kub thiab txias heev thiab cov tshuaj lom neeg. Hauv ib puag ncig dej hiav txwv, tuab - zaj duab xis epoxy yog ua ke nrog kev tiv thaiv cathodic. Rau cov nroj tsuag tshuaj piping tuav cov kua qaub los yog cov kuab tshuaj, cov hauv ob sab hauv xws li PTFE lossis roj hmab yuav raug teev tseg es tsis txhob pleev xim rau - hom txheej.
Daim ntawv thov thiab tshuaj xyuas qhov tseem ceeb
Kev npaj deg txiav txim siab txheej lub neej. Kev tshem tawm tawg kom tsawg kawg yog Sa 2.5 (ze - hlau dawb) nrog rau qhov tseeb thauj tog rau nkoj profile yog yuav tsum tau rau FBE thiab 3LPE; Kev npaj tsis zoo ua rau muaj kev sib cais thaum ntxov tsis hais txog txheej txheej zoo. Thaum lub sij hawm daim ntawv thov txheej thickness, uniformity thiab curing tej yam kev mob yuav tsum tau tswj, txwv tsis pub pinholes, voids thiab tev tawm tshwm nyob rau hauv kev pab cuam. Tom qab daim ntawv thov, hnub so (tshwj xeeb) nrhiav pom cov pinholes thiab liab qab, thiab kev kho yog ua nrog cov khoom siv kho kom haum. Kev tshuaj xyuas ib ntus ntawm cov txheej txheem txheej txheej yog qhov tseem ceeb los tswj kev tiv thaiv kev tsim lub neej.
FAQ
Q1: Lub raj xa dej twg yog qhov zoo tshaj plaws?
Tsis muaj ib txheej zoo tshaj plaws; qhov kev xaiv zoo phim qhov kev pabcuam. FBE thiab 3LPE tswj cov roj thiab roj xa mus, galvanizing suits lub tsev thiab hluav taws kub- kev pabcuam tiv thaiv, thiab PU lossis ceramic txheej raug xaiv rau kev puas tsuaj thiab kub kub. Kev xaiv yuav tsum hnyav nruab nrab, qhov kub thiab txias, av tej yam kev mob, tus nqi thiab lub neej.
Q2: Qhov txawv ntawm FBE thiab 3LPE yog dab tsi?
FBE yog ib zaj duab xis epoxy; 3LPE yog peb- txheej txheej txheej txheej ntawm epoxy primer, nplaum thiab polyethylene topcoat. 3LPE muaj kev tiv thaiv zoo tshaj plaws thiab nyiam rau faus loj - kab kab, thaum ib zaug - txheej FBE yog yooj yim dua thiab feem ntau txaus rau cov kav dej me me thiab nruab nrab.
Q3: Vim li cas qhov kev npaj saum npoo tseem ceeb heev?
Coatings daim ntawv cog lus los ntawm mechanical keying mus rau ib tug huv, profiled nto. Cov kab mob sib kis, xeb lossis qhov chaw du ua rau muaj kev cuam tshuam thiab hauv qab - zaj duab xis corrosion. Sa 2.5 moj tej tawg tu yog tus qauv yam tsawg kawg nkaus rau FBE thiab 3LPE systems.
Q4: Ntev npaum li cas lub raj xa dej yuav kav ntev?
Nrog rau kev npaj thiab thov kom raug, FBE thiab 3LPE systems niaj hnub siv sijhawm ntev li 30 txog 50 xyoo hauv kev pabcuam faus, thiab galvanizing tiv thaiv rau 20 txog 50 xyoo nyob ntawm ib puag ncig. Txheej lub neej nyob deb npaum li cas ntawm kev npaj thiab daim ntawv thov zoo dua li ntawm cov khoom txheej nws tus kheej.
Q5: Cov yeeb nkab puas tuaj yeem welded hauv thaj teb?
Yog lawm, tab sis cov txheej txheem raug muab tshem tawm hauv ib daim kab xev ntawm txhua qhov vuam kawg ua ntej vuam thiab rov ua dua nrog daim teb - siv cov txheej txheem kho (kua epoxy, cua sov- lub tes tsho los yog daim kab xev) tom qab kev sim vuam. Qhov no ua rau cov txheej txheem txheej txuas ntxiv mus raws txoj kab.
Q6: Kev txheeb xyuas hnub so yog dab tsi?
Kev kuaj xyuas hnub so (kev kuaj hluav taws xob) siv qhov hluav taws xob siab rau cov txheej txheej; sparks qhia pinholes, voids los yog nyias me ntsis. Nws yog tus qauv kev kuaj xyuas ua ntej faus lossis submerged coated yeeb nkab yog txo qis rau hauv lub trench.