1.Dab tsi yog qhov tshwm sim ntawm kev ua tsis tiav hauv cov txheej txheem txheej txheej?
Mechanical puas ntsoog: khawb, abrasions, thiab kev cuam tshuam thaum lub sij hawm thauj mus los, kev teeb tsa, thiab kev siv tuaj yeem ua rau cov txheej txheem puas, ncaj qha rau cov hlau substrate.
Txheej aging: Ntev- lub sij hawm raug rau ultraviolet hluav taws xob, kub kub, av noo, thiab tshuaj yuav ua rau cov txheej rau chalk, ploj, nkig, thiab tawg (micro- tawg), poob nws cov khoom tiv thaiv.
Txheej zoo tsis xws luag: Inherent defects thaum lub sij hawm tsim khoom, xws li cov txheej txheem tsis sib xws, cov chaw uas ploj lawm, pinholes, npuas, thiab tsis zoo adhesion, ua qhov pib ntawm corrosion.
Tshuaj corrosion: muaj zog acids, muaj zog alkalis, ntsev tsuag, thiab lwm yam tshuaj ncaj qha erode lub txheej, ua rau nws cov qauv.
2.Dab tsi yog qhov cuam tshuam ntawm corrosion ntawm qhov txiav thiab cov npoo?
Ua rau: Tom qab ua ntej-coated steel kauj yog sheared, xuas nrig ntaus, thiab sawn, cov hlau hla -section yog kiag li raug tsis muaj txheej tiv thaiv.
Txheej txheem:
Corrosive media (dej, oxygen) nkag mus los ntawm kev txiav.
Yog hais tias lub substrate yog galvanized steel, zinc txheej yuav ua raws li ib tug sacrificial anode, nyiam corroding los tiv thaiv lub hauv paus steel. Txawm li cas los xij, yog tias cov txheej txheej nyias dhau los yog qhov chaw corrosive muaj zog heev (xws li ib puag ncig chloride ion siab), kev tiv thaiv yuav sai sai.
Yog tias qhov txiav tsis raug tiv thaiv zoo (piv txwv li, tsis muaj kev kho sealing), corrosion yuav kis mus rau sab hauv los ntawm ntug, ua "hauv- zaj duab xis corrosion" hauv qab txheej, ua rau txheej txheej bulging thiab loj - nplai tev.
3.Dab tsi yog qhov tshwm sim ntawm cov hlau txheej tsis ua haujlwm?
Txheej depletion: Hauv qhov chaw ntub dej, cov txheej txheem (tshwj xeeb yog zinc) tau noj tas li los ntawm "sacrificial anode" los tiv thaiv cov hlau substrate. Thaum cov txheej txheem tag nrho, cov hlau substrate pib corrode.
Cov txheej txheem tsis zoo: Cov txheej txheej tsis sib xws, tsis zoo adhesion, lossis qhov tsis xws luag yuav poob lawv cov kev tiv thaiv ntxov ntxov.
Qhov sib txawv ntawm cov txheej txheej: Qhov kev tiv thaiv corrosion ntawm cov ntawv zoo tib yam galvanized steel, tshwj xeeb tshaj yog lawv cov kev tiv thaiv kev tiv thaiv, yog qhov qis dua ntawm cov zinc thiab zinc ntawm aluminium alloy - txhuas-magnesium steel los xij. Ob lub tom kawg muaj cov khoom siv corrosion denser thiab "tus kheej- kho" cov khoom, ua rau muaj zog tiv thaiv kev txiav ntug oxidation.
4.Dab tsi yog qhov cuam tshuam ntawm ib puag ncig thiab tsim qauv?
High Humidity / Condensation Environment: Sustained high humidity los yog nquag nto condensation muab cov tsim nyog electrolyte rau electrochemical corrosion. Qhov cua tsis zoo, qhov chaw nyob ze yog qhov tshwj xeeb.
Corrosive Atmosphere:
Industrial Pollution: Muaj cov roj ntsha acidic xws li sulfur dioxide thiab hydrogen sulfide, uas ua rau cov dej ua kua qaub, ua kom muaj zog corrosion.
Marine Environment: Muaj ntau cov tshuaj chloride ions, uas muaj zog heev nkag mus rau hauv lub zog thiab tuaj yeem rhuav tshem cov yeeb yaj kiab passivation, ua rau nws yog ib qho chaw corrosive tshaj plaws.
Kev Tsim Nyog:
Cov Qauv Dej Ncua Dej: Cov dej ntws tawm ntawm lub vaj huam sib luag saum npoo los yog cov pob qij txha tsim tsis raug ua rau muaj kev sib txuam dej ntev -.
Galvanic Corrosion: Kev sib cuag ncaj qha ntawm cov coated coil thiab cov hlau reactive ntau dua (xws li qee cov aluminium alloys) los yog stainless hlau tsim cov galvanic cell nyob rau hauv lub xub ntiag ntawm electrolyte, ua rau nws tus kheej corrosion.
Crevice Corrosion: Cov kab mob hnyav hauv cheeb tsam tshwm sim hauv qhov chaw nqaim ntawm qhov sib tshooj thiab bolted kev sib txuas vim qhov sib txawv ntawm cov pa oxygen concentration.
5.Dab tsi yog qhov tseem ceeb ntsuas los tiv thaiv oxidation thiab corrosion?
Kev Xaiv Cov Khoom Siv Zoo: Xaiv qhov zoo tshaj plaws corrosion{0}}resistant substrate (nyiam dua zinc-aluminium-magnesium lossis aluminium-zinc coated sheet) thiab txheej (xws li PVDF fluorocarbon) raws li qhov chaw ua haujlwm.
Kev Tiv Thaiv Txheej: Tsis txhob muaj kev puas tsuaj rau txhua yam thaum lub sijhawm thauj mus los, kev teeb tsa, thiab siv.
Sealed Cuts: Seal tag nrho cov chaw txiav thiab drilled qhov nrog nruab nrab silicone huab cua -resistant sealant lossis tshwj xeeb los tiv thaiv- txheej txheej.
Optimized Design: Tiv thaiv kom tsis txhob muaj dej tsub zuj zuj thiab cov qauv sib txawv los tiv thaiv galvanic corrosion thiab ua kom muaj cua zoo.
Cia kom zoo: Khaws rau hauv qhov chaw qhuav thiab khaws lub ntim kom zoo.