Dawb xeb thiab liab xeb yog qhov tsis xws luag hauvgalvanized steel ntawv. Cov thicknesses sib txawv ntawm galvanized txheej yuav ua rau muaj kev puas tsuaj rau lub sijhawm tiam ntawm xeb dawb thiab xeb liab?
Cia peb ua pov thawj los ntawm kev sim ua kom lub thickness ntawm cov galvanized txheej ntawm cov khoom tsis muaj kev puas tsuaj rau lub sij hawm tiam ntawm dawb xeb nyob rau saum npoo ntawm galvanized steel ntawv; Lub thickness ntawm galvanized txheej muaj feem xyuam rau lub sij hawm tiam ntawm xeb liab nyob rau saum npoo ntawm galvanized steel ntawv. Lub thicker cov zinc txheej, ntev lub sij hawm incubation rau liab xeb.
Yog li yuav ua li cas dawb xeb thiab liab xeb tshwm sim nyob rau saum npoo ntawm galvanized steel los xij?
Zinc yog cov khoom siv hlau uas muaj zog heev. Qhov saum npoo ntawm zinc yuav raug hloov pauv tshuaj nrog cov dej vapor hauv huab cua los ua ntau txheej ntxeem tau thiab nplaum Zn (OH) 2. Tom qab ntawd Zn (OH) 2 yuav ntxiv cov tshuaj tiv thaiv nrog cov pa roj carbon dioxide nyob rau hauv cov huab cua los ua ib qho nyias, siab-density, qee cov nplaum txheej ntawm zinc carbonate (2ZnCO3.3Zn(OH) 2), uas tuaj yeem tiv thaiv cov zinc txheej corrodes. ntxiv.
Thaum Galvanized steel ntawv yog ze ze ntim thiab muab tso rau hauv cov av noo, thiab lub zos txheej av ntawm lub galvanized txheej ntawm cov khoom tiv thaiv corrosion . Kev hloov tshuaj lom neeg ntawm cov yeeb yaj kiab yuav ua rau electrochemical corrosion thiab tsim cov xeb dawb. Cov txheej txheem ntau lawm ntawm cov xeb dawb yog qhov tseeb ntawm "oxygen concentration sib txawv corrosion roj teeb".
Qhov hnyav ntawm cov xeb dawb feem ntau yog nyob ntawm qhov muaj pes tsawg leeg ntawm cov dej condensation ntawm cov txheej txheej thiab lub sijhawm ntawm ib puag ncig. Yog hais tias cov dej condensed muaj chloride los ntawm seawater, nws yuav ua rau kom cov conductivity ntawm cov dej, yog li nce tus nqi ntawm electrochemical corrosion thiab accelerating tus nqi corrosion ntawm galvanized txheej.
Lub hauv paus ua rau liab xeb
Tom qab cov zinc txheej rau ntawm qhov chaw ntawm cov ntawv hlau galvanized yog corroded tam sim ntawd, lub substrate pib react electrochemically nrog cov ya raws hauv huab cua. Lub ntsiab chemical Cheebtsam nyob rau hauv lub substrate yog hlau thiab carbon. Hlau thiab carbon tsim ib galvanic cell thiab galvanic cell tshwm sim. Qhov sib npaug ntawm cov tshuaj tiv thaiv yog raws li nram no:
4Fe+6H2O+3O2=4(FeOH)3
2(FeOH)3=Fe2O3+3H2O
Fe2O3 yog xim liab thiab yog lub ntsiab ntawm xeb.
Cov ntaub ntawv pov thawj saum toj no qhia tau tias cov xeb dawb yog tsim nyob rau tib lub sijhawm thaum kuaj thiab tshuaj xyuas ntawm 80g / m2 galvanized txheej thiab 120g / m2 galvanized txheej. Cov ntawv tsis pleev xim galvanized steel nrog zinc txheej ntawm 80g / m2 yuav ua rau xeb liab tom qab.
Yuav ua li cas yog tias daim ntawv galvanized hloov dawb
Xyuas seb cov txheej txheej saum npoo ntawm cov khoom kub-dip galvanized hloov dawb tom qab wetted. Nws yog qhov tshwm sim ib txwm muaj uas zinc ntawm txheej txheej yog oxidized. Passivation kev kho mob yog nqa tawm tom qab electro-galvanizing. Feem ntau, yuav tsis muaj teeb meem dawb. Yog tias cov kev xav tau rau kev tiv thaiv corrosion siab dua, koj tuaj yeem xav txog kev ntxiv tus neeg sawv cev tom qab sealing.
1. Nws yog ib qho teeb meem zoo ntawm passivation. Qhov teeb meem feem ntau yog tias passivation tsis zoo li qub lossis lub thickness tsis ua raws li tus qauv.
2. Muaj cov dej seem seem ntawm cov hlau uas tsis tau kho. Thaum curling, qhov saum npoo ntawm cov hlau muaj cov dej noo uas tsis tau qhuav, los yog nws tsis tau qhuav kom huv si thaum lub sij hawm passivation.
3. Cov kev thauj mus los tsis zoo.
Tshwj xeeb hauv:
1. Ua kom ntub dej lossis ntub dej los ntawm nag thaum lub sijhawm khaws cia thiab kev thauj mus los.
2. Cov khoom siv hlau tiav tau khaws cia ntev dhau lawm.
Yog li ntawd, peb tuaj yeem paub tias kev ua haujlwm tiv thaiv corrosion ntawm galvanized steel ntawv yuav tsum tau ua los ntawm ob yam:
1. Nws yog ib qho tsim nyog yuav tsum tau siv cov khoom siv passivation nrog kev ua tau zoo dua rau passivate galvanized steel los xij.
2. Nws yog ib qho tsim nyog yuav tsum ua kom tsis tu ncua txhim kho kev cia ntawm cov ntawv hlau galvanized.
Ua rau dawb xeb
① Cov huab cua nyob sab hauv tsev siab heev.
② Tom qab cov ntawv galvanized yog tsim thiab ua tiav, qhov kub ntawm cov hlau kauj yog siab dhau lawm, ua rau cov txheej txheem dej ua kom sib haum rau ntawm qhov chaw. Thaum cov dej noo hauv huab cua nce mus txog 60% lossis hauv
Hauv thaj tsam ntawm 85 ~ 95% thiab PH<6, the corrosion reaction is more severe. When the water temperature reaches about 70°C, it corrodes the zinc layer faster.
③ Corroded los ntawm acidic gas los yog kua.
④ Cov khoom tiav tau muab cia rau hauv lub tsev rau khoom yam tsis tau qhuav thiab ua tiav raws sijhawm thaum ntim khoom.
Kev tshem tawm tswv yim:
Tiv thaiv kom tsis txhob muaj dej tawm thaum lub sij hawm ntim khoom lossis kev thauj mus los thiab dej seepage ntawm steel coils;
Tswj lub ambient kub ntawm lub coiling thiab ntim cov cheeb tsam kom siab tshaj qhov dew point kub;
nruj me ntsis raws li kev ntim khoom kub thiab lub sij hawm tswj;
Hlau coils nrog dej seepage yuav tsum tau ua raws sijhawm.
