1.Yuav ua li cas raws nraim li electrochemical corrosion manifest nws tus kheej?
Electrode Tsim:
Anode (Sacrificial Electrode): Txhuas (Al). Aluminium yog tshuaj lom neeg ntau dua li cov hlau, ua rau cov txheej txheem hluav taws xob qis dua.
Cathode (Protected Electrode): Txias-rolled coil (steel, feem ntau yog tsim los ntawm Fe).
Txheej txheem Corrosion:
Hauv qhov chaw ntub dej, ib qho electrolyte (xws li dej) txuas ob lub hlau.
Aluminium, ua raws li lub anode, nquag plam electrons thiab oxidized rau hauv txhuas ions (Al³⁺), uas yaj rau hauv cov electrolyte.
Cov hluav taws xob ntws mus rau cov hlau, ua raws li cathode, qhov twg cov tshuaj tiv thaiv txo qis tshwm sim ntawm cov hlau nto (feem ntau yog cov pa oxygen thiab dej tau txais hluav taws xob los ua hydroxide ions).
Qhov tshwm sim yog tias aluminium coil corrodes sai dua li nws yuav nyob ib leeg, ua cov hmoov dawb alumina lossis ntau dua txhuas xeb. Cov hlau (txias-rolled coil), txawm li cas los xij, muaj kev tiv thaiv, thiab corrosion yog qeeb.
2.Dab tsi tshwj xeeb tshwm sim yuav tshwm sim?
Aluminium coils: Dawb, tawm -dawb, los yog hmoov corrosion khoom (aluminium hydroxide, aluminium oxide, thiab lwm yam) tsim rau saum npoo. Hauv qhov xwm txheej hnyav, qhov no tuaj yeem ua rau cov khoom siv txhuas nyob ib puag ncig ntawm qhov taw tes riveting kom nyias, poob lub zog, thiab txawm tias loosen cov rivets.
Txias-rolled steel coils: Txawm hais tias muaj kev tiv thaiv raws li cathode, lawv tus kheej oxidation (rusting, reddish-xim av Fe₂O₃) tseem tuaj yeem tshwm sim yog tias ib puag ncig hnyav lossis txheej txheej puas, txawm tias tus nqi feem ntau qeeb dua thaum lawv nyob ib leeg.
Kev sib cuag ntawm qhov chaw: Corrosion yuav yog qhov hnyav tshaj plaws hauv cov seam uas ob lub hlau sib ntsib. Nws yog qhov nyuaj rau kev kuaj pom qhov muag tab sis yuav cuam tshuam rau kev sib txuas lub zog.
3.Yuav ua li cas thiaj ua tau hluav taws xob rwb thaiv tsev / kev sib cais?
Siv cov khoom siv insulating / cov hniav: nruab nrab ntawm txhuas thiab steel coils, thiab nruab nrab ntawm cov rivets thiab cov khoom siv, siv cov khoom siv tsis yog -cov khoom siv hluav taws xob (xws li roj hmab, nylon, lossis engineering yas gaskets) los yog coated bushings los thaiv cov hlau ncaj nraim - mus rau -hlau thiab hluav taws xob txoj hauv kev.
Siv cov txheej txheem insulating: Siv cov txheej txheej insulating, epoxy primers, lossis zinc-chromium coatings (Dacromet) rau qhov chaw sib cuag.
4.Yuav ua li cas xaiv txoj cai rivets?
Tsis txhob siv carbon steel rivets. Stainless hlau rivets, uas muaj peev xwm nyob ze rau ntawm txhuas (ceeb toom: qee qhov stainless hlau tseem muaj qhov sib txawv nrog txhuas) lossis txhuas rivets tuaj yeem siv. Qhov zoo tshaj plaws, aluminium rivets nyiam vim tias lawv yog cov khoom siv tib yam li aluminium coils thiab yuav tsis ua rau galvanic corrosion.
5.Yuav ua li cas kho qhov chaw thiab txheej?
Ob yam khoom muaj kev tiv thaiv ib leeg: piv txwv li, txias-khoov coils yog galvanized (zinc muaj qhov sib txawv me me nrog txhuas, thiab zinc yuav ua ntej fij thiab tiv thaiv hlau), phosphate kho, los yog txau nrog cov tshuaj tiv thaiv- xeb. Aluminium coils yog anodized los yog txau.
Zuag qhia tag nrho txheej: Tom qab riveting thiab sib dhos, tag nrho lub rooj sib txoos yog uniformly sprayed rau kev tiv thaiv, cais qhov khoob ntawm ib puag ncig. Xyuas kom cov txheej txheem nkag mus rau hauv cov pob qij txha.