1.Qhov ib puag ncig hnyav npaum li cas hauv thaj chaw muaj kuab paug?
High concentrations ntawm chemical pollutants:
Acid gases: SO₂ (sulfur dioxide), NOx (nitrogen oxides), HCl (hydrogen chloride), thiab lwm yam, yog yooj yim soluble nyob rau hauv dej los tsim kua qaub nag thiab kua qaub pos, uas ncaj qha corrode coatings thiab hlau substrates.
Alkaline tshuaj: xws li ammonia (NH₃).
Ntsev: Chloride ions (Cl⁻) nyob rau hauv ntug dej hiav txwv los yog cov nroj tsuag tshuaj muaj zog heev corrosive thiab muaj peev xwm nkag mus rau lub txheej thiab rhuav tshem cov hlau passivation txheej, uas yog culprit ntawm pitting corrosion.
Cov teeb meem tsis sib haum: cov pa luam yeeb thiab plua plav ua raws li qhov chaw, nqus cov dej noo thiab cov pa phem, thiab tsim cov roj teeb hauv zos.
Cua sov thiab condensation:
Cov chaw lag luam feem ntau nrog rau qhov kub thiab txias, cov av noo siab lossis kub hloov pauv, uas tuaj yeem tsim cov condensation rau saum npoo ntawm cov khoom. Lub condensate concentrates cov pa phem nyob rau hauv cov huab cua los ua ib tug heev concentrated corrosive kua, uas tsis tu ncua nkag mus thiab soaks lub txheej.
2.Dab tsi yog qhov tsis ua haujlwm thiab kev ua haujlwm ntawm cov xim -coated yob nyob rau hauv ib puag ncig no?
Rapid aging ntawm txheej:
Chalking thiab fading: Lub synergistic nyhuv ntawm ultraviolet rays, tshuaj thiab ya raws ua rau cov txheej resin degrade, cov xim rau hmoov thiab poob tawm, thiab cov tsos ntawm deteriorate sai sai.
Blistering thiab tev tawm: Qhov nruab nrab corrosive nkag mus rau hauv qhov sib cuam tshuam ntawm txheej txheej thiab substrate, lossis nkag mus rau hauv txheej txheej galvanized, tsim cov khoom siv corrosion. Lub ntim expansion ua rau lub txheej rau bulge thiab tev tawm.
Accelerated noj ntawm galvanized txheej:
Nyob rau hauv ib qho chaw huv si, txheej galvanized yog maj mam noj raws li "sacrificial anode" los tiv thaiv lub hauv paus hlau. Txawm li cas los xij, nyob rau hauv cov cheeb tsam uas muaj kuab heev, cov khoom xws li cov kua qaub thiab cov ntsev ncaj qha ua rau lub zog ntawm zinc. Tus nqi noj ntawm zinc txheej tuaj yeem nce ntau mus rau ntau lub sijhawm, thiab lub sijhawm tiv thaiv luv luv heev.
Ceev ceev corrosion ntawm substrate:
Thaum cov txheej txheem tsim txawm tias me me pinholes, khawb (saib qhov kev sib tham yav dhau los ntawm khawb thiab tawg), lossis cov txheej galvanized tau noj, cov xov xwm corrosive yuav ncaj qha rau cov hlau substrate, ua rau xeb sai thiab punctures.
3.Vim li cas nws tsis pom zoo kom siv cov txheej txheem xim coated yob?
Txawm tias cov xim zoo tib yam -coated yob nrog PE lossis SMP txheej tsuas yog muaj lub neej ntev ntawm 1-3 xyoo nyob rau hauv ib puag ncig no, ua rau muaj kev tu thiab hloov tsis tu ncua, tag nrho cov nqi siab thiab muaj peev xwm muaj kev nyab xeeb.
4.Yog tias koj hais kom siv cov txheej txheem xim txheej, dab tsi yog kev ceev faj?
Substrate: Xaiv aluminized zinc (AZ) substrate (corrosion kuj zoo dua li ntshiab galvanized) los yog galvanized ntawv nrog siab zinc txheej ntsiab lus (xws li Z275).
Txheej: PVDF (fluorocarbon) txheej yuav tsum tau siv. Nws cov tshuaj lom neeg zoo heev thiab huab cua tsis kam yog qhov kev xaiv nkaus xwb uas yuav kav ntev mus ntev hauv ib puag ncig no.
Txheej thickness: Xaiv cov khoom nrog pem hauv ntej txheej thickness> 25μm lossis siab dua.
Txawm li cas los xij, qhov no tsuas yog "kev txhim kho", tsis yog "kho", thiab koj tseem yuav tsum xav tias yuav tsum muaj sijhawm tu ncua luv dua li qhov chaw ib puag ncig.
5.Dab tsi yog qhov ntau txhim khu kev qha, kev hloov pauv tseem ceeb?
iav fiber reinforced yas (FRP): xav pom zoo. Nws muaj kev tiv thaiv corrosion zoo heev rau cov kua qaub, alkali thiab ntsev tsuag, thiab yog sib xyaw ua ke tsis muaj seams. Nws yog tshwj xeeb tshaj yog haum rau siv raws li lub plhaub, kav dej, scrubbers, thiab lwm yam nyob rau hauv ib puag ncig tshuaj.
Stainless hlau:
316/316L stainless hlau: Muaj molybdenum, thiab nws cov chloride ion pitting corrosion kuj zoo dua li ntawm 304.
Duplex stainless hlau: siab zog thiab zoo corrosion kuj.
Galvanized ntawv / carbon hlau + hnyav tiv thaiv -corrosion txheej txheej:
Siv cov khoom hnyav-lub luag haujlwm los tiv thaiv- cov txheej txheem corrosion (xws li epoxy zinc- nplua nuj primer + epoxy mica intermediate xim + fluorocarbon / polysiloxane topcoat), kev tsim kho thiab tswj tau txheej txheem yog ua nyob rau hauv lub Hoobkas, thiab cov txheej txheem zoo tshaj nyob rau ntawm - txheej txheej.