1. Yuav ua li cas corrosion ntawm galvanized coils txawv ntawm saline -alkali av thiab cov chaw lag luam zoo tib yam lossis thaj chaw ntug dej hiav txwv?
Qhov no yog qhov sib txawv ntawm "ob chav whammy" thiab "ib leeg nres":
Ordinary industrial area/coastal area: Feem ntau ntsev tsuag corrosion muaj chloride ions (Cl⁻, ntsev). Qhov no sai sai siv cov zinc txheej, ua rau pitting corrosion.
Inland saline-alkali av: Nws tsis tsuas yog muaj cov ntsev ntsev ntau heev (tshwj xeeb yog cov ntsev ntsev), tab sis nws kuj muaj zog alkalinity (siab pH nqi).
The "1+1>2" nyhuv: Alkalinity tsis tu ncua "dissolves" zaj duab xis tiv thaiv ntawm zinc txheej nto, ncaj qha nthuav tawm cov hlau hauv qab rau ntsev, yog li ua rau muaj zog electrochemical corrosion. Ib txhij, qhov chaw muaj zog electrolyte no tuaj yeem ua rau hauv av tiv thaiv kab mob, ua rau muaj kev nyab xeeb.
2.Qhov kev pab cuam lub neej ntawm galvanized steel coils ntawm saline -alkali av yog dab tsi? Nws puas tuaj yeem kav 20 xyoo?
Feem ntau, nws nyuaj. Hauv cov dej qab ntsev-alkali ib puag ncig, tus qauv zinc txheej tuab tsis txaus los muab kev tiv thaiv kev ntseeg siab rau "20-xyoo" ntev:
Standard lifespan poob sharply: Nyob rau hauv ib txwm nruab nrab av, tsim lub neej ntawm galvanized steel yuav ncav cuag 20-30 xyoo. Txawm li cas los xij, hauv cov av saline heev, tus lej no yuav luv luv mus txog li 7-12 xyoo.
Txawm tias luv dua nyob rau hauv ib puag ncig huab cua: Hauv cov ntsev ntsev ntau heev -alkali av, nws lub neej kev pab cuam txawm tias tsuas yog 5-10 xyoo. Ib qho zinc txheej nyias nyias tuaj yeem ua tsis tiav hauv 1-2 xyoos xwb.
Tsim kev sib piv ntawm kev ua neej: Ib daim ntawv kub -dip galvanized steel ntawv tsim rau saline-alkali xau muaj ntsev tsuag corrosion kuj ntawm kwv yees li 10 xyoo; thaum lub neej ntawm cov khoom siv stainless hlau tshwj xeeb tshaj li lub sijhawm no.
3.Vim li cas galvanized coils poob sai sai hauv saline-alkali av?
Lub hauv paus yog vim li cas nyob rau hauv huab cua electrolyte ib puag ncig muab los ntawm saline -alkali av, ua rau peb lub ntsiab tsis ua hauj lwm hom:
Kev noj cov zinc txheej nrawm: Chloride ions (Cl⁻) hauv cov ntsev-alkali av ua rau cov yeeb yaj kiab tiv thaiv ntawm zinc txheej txheej, ua rau "active-}inert" galvanic cell, ua rau cov zinc txheej tau sai sai.
Alkaline ib puag ncig "pab": Cov nqi pH siab heev ncaj qha cuam tshuam cov tshuaj zinc, ua kom nws cov kuab lom sai. Nws ua zoo li lub zog tsis tu ncua, tas li "dev" cov txheej txheem zinc.
Qhov tshwm sim yog "pitting" tig mus rau "perforation": Corrosion thawj zaug pib ntawm me me tsis xws luag, tsim pits (pitting corrosion). Sij hawm dhau mus, cov pits no tau loj hlob sai mus rau hauv - qhov, ua rau lub cev tsis muaj zog tam sim ntawd uas nyuaj heev los kho.
4. Puas muaj lwm cov ntaub ntawv los yog kev tiv thaiv kev daws teeb meem zoo dua li cov coils zoo tib yam?
Qhov tsim nyog kiag li, thiab muaj cov kev daws teeb meem! Kev cia siab tag nrho ntawm cov galvanized coils zoo tib yam hauv saline-alkali xau yog qhov tsis zoo. Cov kev daws teeb meem hauv qab no tau teev nyob rau hauv kev txiav txim ntawm qib kev tiv thaiv thiab tus nqi ntawm qis mus rau siab:
Txhim kho kev daws teeb meem (Thickened Txheej): Doubling lub thickness ntawm kub -dip galvanized txheej los ntawm 60-100µm mus rau 100-150µm. Lub thicker "cov ntaub thaiv npog" tso cai rau nws kom muaj sia nyob ntev dua ua ntej noj tag nrho.
Composite Solution (Dual Protection: Galvanized + Txheej): Siv cov txheej tuab ntawm epoxy zinc-nplua nuj primer thiab tuab txheej ntawm polyurethane topcoat rau saum txheej galvanized. Qhov no tsim muaj kev tiv thaiv ob npaug ntawm "sacrificial anode + lub cev cais tawm," ua rau nws txoj sia ntev heev.
High-Performance Txheej (Zn-Al-Mg): Siv zinc-aluminium-magnesium (Zn-Al-Mg) alloy coated phaj. Nws cov tshuaj tsw qab ntsev yog 3-5 npaug ntawm cov phaj galvanized zoo tib yam. Qhov zoo tshaj plaws, txawm tias thaum khawb, nws qhov tshwj xeeb "tus kheej- kho" cov txheej txheem cia li tsim cov yeeb yaj kiab tiv thaiv los kaw qhov txhab, ua rau nws tsim tshwj xeeb rau cov cheeb tsam hnyav xws li av saline-alkali.
Kev Hloov Kho Tseem Ceeb (Substrate Hloov): Rau cov qauv tseem ceeb, galvanized steel raug tso tseg hauv kev pom zoo ntawm 316L stainless hlau. Nws alloy oxide zaj duab xis, tsim los ntawm chromium thiab npib tsib xee, fundamentally resists chloride ion corrosion, muab ntev - tiv thaiv corrosion nyob rau hauv saline -alkali thiab ntug dej hiav txwv ib puag ncig.
5. Dhau li ntawm cov ntaub ntawv lawv tus kheej, puas muaj kev ceev faj tshwj xeeb uas yuav tsum tau ua thaum lub sij hawm tu thiab kev teeb tsa?
Tau kawg! Kev txhim kho thiab kev kho kom zoo yog qhov tseem ceeb. Nov yog peb lub ntsiab lus tseem ceeb:
Tiv thaiv "mob mob": Tsis txhob khawb, thiab cov pob qij txha welded yuav tsum tau kho tam sim ntawd thiab huv si nrog zinc- nplua nuj txheej. Thaum fabricating Cheebtsam, ua qhov tseem ceeb ntawm kev siv cov hlau tsis muaj steel bolts kom tsis txhob muaj hluav taws xob sai dua los ntawm qhov sib txawv.
Kev cais lub cev yog qhov tseem ceeb: Lub cev tiv thaiv yog txoj kev ncaj nraim. Txhua qhov chaw nyob rau hauv kev sib cuag nrog av yuav tsum tau haum nrog roj hmab insulating mats; rau txhua qhov chaw faus, xws li kev txhawb nqa, nws raug pom zoo kom qhwv lawv nrog asphalt anti-corrosion daim kab xev lossis npog lawv nrog cov kav dej PVC.
Tsis tu ncua "ntxuav" yog ib qho tseem ceeb: ntsev tsub zuj zuj nyob rau saum npoo tsim ib qho tshuaj electrolyte, tsis tu ncua ua rau "slow corrosion." Hauv cov dej qab ntsev- thaj chaw alkali, cov hlau saum npoo yuav tsum tau yaug nrog dej huv, tshwj xeeb tshaj yog tshem cov plua plav thiab cov noog poob. Qhov no zoo ntxuav tawm qhov chaw corrosion.