Yuav ua li cas tiv thaiv corrosion ntawm steel qauv?
Nrog rau kev nce qib ntawm cov khoom siv steel, cov qauv steel muaj ntau dua thiab nrov dua.Nws yog dav siv los ua warehouse, Rhiav, garage, prefab apartment, khw khw, prefab stadium, thiab lwm yam. Piv nrog rau cov pob zeb ua vaj tse, steel qauv vaj tse muaj qhov zoo ntawm kev tsim kho yooj yim, zoo seismic kev ua tau zoo, tsawg ib puag ncig muaj kuab paug thiab recyclability.Txawm li cas los xij, cov qauv hlau yog yooj yim rau xeb, yog li kev tiv thaiv corrosion yog qhov tseem ceeb heev rau cov qauv hlau.
Cov hom corrosion ntawm steel qauv muaj xws li atmospheric corrosion, lub zos corrosion thiab kev nyuaj siab corrosion.
(1) Atmospheric corrosion
Atmospheric corrosion ntawm steel qauv yog tsuas yog tshwm sim los ntawm cov tshuaj thiab electrochemical los ntawm dej thiab oxygen nyob rau hauv cov huab cua.Cov dej vapor hauv huab cua tsim cov txheej txheem electrolyte ntawm cov hlau, thiab cov pa oxygen hauv huab cua yog yaj hauv nws ua cathode depolarizer.Lawv tsim ib qho yooj yim corrosive galvanic cell nrog steel Cheebtsam.Tom qab xeb txheej yog tsim nyob rau saum npoo ntawm cov neeg hlau los ntawm atmospheric corrosion, cov khoom corrosion yuav cuam tshuam cov electrode cov tshuaj tiv thaiv atmospheric corrosion.
(2) Local corrosion
Local corrosion yog feem ntau nyob rau hauv steel qauv tsev, feem ntau galvanic corrosion thiab crevice corrosion.Galvanic corrosion feem ntau tshwm sim ntawm cov hlau sib txawv los yog kev sib txuas ntawm cov qauv hlau.Cov hlau uas muaj peev xwm tsis zoo corrodes sai dua, thaum cov hlau uas muaj peev xwm zoo tiv thaiv.Ob lub hlau yog corrosive galvanic cell.
Crevice corrosion feem ntau tshwm sim nyob rau hauv qhov chaw crevices ntawm cov tswv cuab sib txawv ntawm cov qauv hlau thiab nruab nrab ntawm cov tswv cuab thiab cov hlau tsis yog hlau.Thaum lub crevice dav yuav ua rau cov kua stagnate nyob rau hauv lub crevice, qhov rhiab heev crevice dav ntawm steel qauv crevice corrosion yog 0.025 ~ o.1 hli.
(3) Kev ntxhov siab corrosion
Hauv ib qho nruab nrab, cov qauv hlau tsis tshua muaj corrosion thaum nws tsis nyob rau hauv kev ntxhov siab, tab sis tom qab raug kev nyuaj siab tensile, cov khoom yuav tawg sai sai tom qab ib lub sij hawm.Vim tias tsis muaj qhov pom tseeb ntawm kev ntxhov siab corrosion ua ntej, nws feem ntau ua rau muaj kev puas tsuaj loj, xws li kev sib tsoo choj, cov kav dej xau, lub tsev tawg thiab lwm yam.
Raws li kev txhim kho corrosion ntawm steel qauv, nws cov corrosion yog ib hom kev puas tsuaj tsis sib xws, thiab kev txhim kho corrosion sai heev.Thaum lub npoo ntawm steel qauv yog corroded, lub qhov corrosion yuav tsim sai heev los ntawm lub qhov hauv qab mus rau qhov tob, uas ua rau muaj kev ntxhov siab concentration ntawm steel qauv, uas yuav ua rau kom lub corrosion ntawm steel, uas yog ib tug vicious vajvoog.
Corrosion txo qhov txias brittleness kuj thiab qaug zog lub zog ntawm cov hlau, uas ua rau lub nkig tawg tam sim ntawd ntawm load-bearing Cheebtsam yam tsis muaj cov cim qhia ntawm deformation, ua rau lub cev qhuav dej ntawm lub tsev.
Kev tiv thaiv txoj kev steel qauv corrosion
1. Siv cov hlau tiv taus huab cua
Tsawg alloy steel series ntawm cov hlau zoo tib yam thiab stainless hlau.Weathering steel yog ua los ntawm cov pa roj carbon zoo tib yam nrog me me ntawm corrosion-resistant ntsiab xws li tooj liab thiab npib tsib xee.Nws muaj cov yam ntxwv ntawm lub zog thiab toughness, yas txuas ntxiv, sib sau, vuam thiab txiav, puas, kub kub thiab qaug zog tsis kam ntawm cov hlau zoo;Cov huab cua tsis kam yog 2 ~ 8 npaug ntawm cov pa roj carbon zoo tib yam, thiab cov txheej txheem kev ua haujlwm yog 1.5 ~ 10 npaug ntawm cov pa roj carbon zoo tib yam.Nyob rau tib lub sijhawm, nws muaj cov yam ntxwv ntawm xeb tsis kam, corrosion kuj ntawm cov khoom, lub neej txuas ntxiv, thinning thiab noj txo, txuag zog thiab txuag hluav taws xob.Weathering steel feem ntau yog siv rau cov qauv steel uas raug rau cov huab cua ntev ntev, xws li kev tsheb ciav hlau, tsheb, txuas hniav, yees thiab lwm yam.Nws yog siv los tsim cov thawv, tsheb ciav hlau, roj derricks, seaport vaj tse, roj ntau lawm platforms thiab ntim khoom uas muaj hydrogen sulfide corrosive media hauv tshuaj thiab roj av.Nws qhov kub tsis tshua muaj kev cuam tshuam toughness kuj zoo dua li cov qauv hlau dav dav.Tus qauv yog weathering steel rau welded lug (GB4172-84).
Lub amorphous spinel oxide txheej txog 5O ~ 100 m tuab tsim ntawm txheej xeb thiab matrix yog ntom thiab muaj adhesion zoo nrog cov hlau matrix.Vim tias lub hav zoov ntawm no dense oxide zaj duab xis, nws tiv thaiv kev cuam tshuam rau cov khoom siv hlau, thiab txhim kho cov khoom siv hlau ua kom tsis kam ntawm cov ntaub ntawv steel.
2. Kub dip galvanizing
Kub dip galvanizing corrosion tiv thaiv yog dip lub workpiece yuav tsum tau plated rau hauv molten hlau zinc da dej rau plating, thiaj li tsim ib tug ntshiab zinc txheej nyob rau saum npoo ntawm lub workpiece thiab ib tug zinc alloy txheej nyob rau hauv lub thib ob nto, thiaj li mus paub. kev tiv thaiv hlau thiab hlau.
3. Arc spraying anticorrosion
Arc spraying yog siv cov cuab yeej tshwj xeeb txau kom yaj cov hlau txau hlau nyob rau hauv qhov kev txiav txim ntawm qhov tsis tshua muaj hluav taws xob thiab siab tam sim no, thiab tom qab ntawd txau mus rau cov khoom hlau ua ntej sanded thiab derusted los ntawm compressed cua los ua arc sprayed zinc thiab aluminium coatings, uas yog sprayed nrog anti-corrosion sealing coatings los tsim ib lub sij hawm ntev los tiv thaiv corrosion composite txheej.Cov txheej tuab tuaj yeem tiv thaiv qhov nruab nrab corrosive los ntawm dipping rau hauv substrate.
Cov yam ntxwv ntawm arc spraying anti-corrosion yog: lub txheej muaj adhesion siab, thiab nws adhesion yog unmatched los ntawm zinc nplua nuj xim thiab kub-dip zinc.Cov txiaj ntsig ntawm kev cuam tshuam dabtsi yog khoov ntawm lub workpiece kho nrog arc txau los tiv thaiv corrosion tsis tsuas yog ua tau raws li cov qauv tsim nyog, tab sis kuj hu ua "laminated steel phaj";Lub sij hawm tiv thaiv corrosion ntawm arc txau txheej yog ntev, feem ntau 30 ~ 60A, thiab cov txheej thickness txiav txim siab lub neej tiv thaiv corrosion ntawm txheej.
4. Anti corrosion ntawm thermal sprayed aluminium (zinc) composite txheej
Thermal spraying aluminium (zinc) composite coating is a long-term anti-corrosion method with the same effect as kub-dip galvanizing.Cov txheej txheem yog tshem tawm cov xeb ntawm qhov chaw ntawm cov neeg hlau los ntawm cov xuab zeb blasting, yog li ntawd cov saum npoo tau nthuav tawm nrog cov hlau nplaum thiab roughened;Tom qab ntawd siv cov nplaim hluav taws xob acetylene kom yaj cov xaim xaim tsis tu ncua (zinc) xaim thiab tshuab mus rau saum npoo ntawm cov tswv cuab steel nrog cov cua compressed los tsim cov honeycomb aluminium (zinc) txau txheej (thickness txog 80 ~ 100m);Thaum kawg, cov pores tau ntim nrog epoxy resin lossis neoprene xim los tsim cov txheej txheem sib xyaw.Thermal sprayed aluminium (zinc) composite txheej tsis tuaj yeem siv rau ntawm phab ntsa sab hauv ntawm tubular cov tswv cuab.Yog li ntawd, ob qho tag nrho ntawm cov tubular cov tswv cuab yuav tsum tau kaw airtight los tiv thaiv corrosion ntawm phab ntsa sab hauv.
Qhov zoo ntawm cov txheej txheem no yog tias nws muaj zog yoog raws qhov loj ntawm cov khoom, thiab cov duab thiab qhov loj ntawm cov khoom yuav luag tsis txwv;Lwm qhov zoo dua yog tias cov nyhuv thermal ntawm cov txheej txheem yog hauv zos, yog li cov khoom yuav tsis tsim thermal deformation.Piv nrog rau kub-dip galvanizing, industrialization degree ntawm thermal spraying aluminium (zinc) composite txheej yog tsawg, kev siv zog ntawm cov xuab zeb blasting thiab txhuas (zinc) spraying yog siab, thiab qhov zoo kuj yog yooj yim cuam tshuam los ntawm cov kev xav ntawm cov tswv. .
5. Txheej anticorrosion
Cov txheej txheem tiv thaiv corrosion ntawm steel qauv xav tau ob txoj kev: kev kho lub hauv paus thiab txheej txheej.Lub hom phiaj ntawm kev kho mob hauv paus yog tshem tawm burr, xeb, roj stain thiab lwm yam txuas rau ntawm qhov chaw ntawm cov khoom, thiaj li nthuav tawm cov xim hlau rau ntawm qhov chaw ntawm cov khoom;Qhov ntau qhov kev kho mob hauv paus, qhov zoo dua cov nyhuv adhesion.Cov txheej txheem kev kho mob yooj yim suav nrog kev siv phau ntawv thiab kev kho tshuab, kev kho tshuaj, kev kho tshuab txau, thiab lwm yam.
Raws li kev siv txheej txheej, feem ntau siv txhuam txoj kev muaj xws li phau ntawv txhuam txoj kev, phau ntawv dov txoj kev, dip txheej txheej, cua txau txoj kev thiab airless spraying.Txoj kev txhuam hniav tsim nyog tuaj yeem ua kom zoo, nce qib, txuag cov ntaub ntawv thiab txo cov nqi.
Nyob rau hauv cov nqe lus ntawm txheej txheej, muaj peb hom: primer, nruab nrab xim, primer, primer thiab primer.Lub primer feem ntau plays lub luag hauj lwm ntawm adhesion thiab xeb tiv thaiv;Lub topcoat mas plays lub luag hauj lwm ntawm anti-corrosion thiab anti-aging;Kev ua haujlwm ntawm cov xim nruab nrab yog nruab nrab ntawm cov primer thiab tiav, thiab tuaj yeem ua kom cov yeeb yaj kiab tuab.
Tsuas yog thaum cov primer, nruab nrab lub tsho tiv no thiab cov tsho loj sab saum toj siv ua ke tuaj yeem ua lub luag haujlwm zoo tshaj plaws thiab ua tiav cov txiaj ntsig zoo tshaj plaws.
Post lub sij hawm: Mar-29-2022