1. Vim li cas thiaj li tiv thaiv- kev kho corrosion yog tsim nyog rau lub vuam seam tom qab galvanized coil vuam?
A: Zinc txheej rau ntawm qhov chaw ntawm galvanized kauj yog nyob ntawm nws txoj kev tiv thaiv cathodic thiab muaj peev xwm tsim cov yeeb yaj kiab oxide ntom rau kev tiv thaiv corrosion. Txawm li cas los xij, qhov kub thiab txias tsim thaum lub sij hawm vuam ua rau lub cev thiab tshuaj hloov pauv hauv qhov chaw vuam, ua kom puas tag nrho cov txheej txheem zinc. Qhov kub ntawm qhov vuam (ntau tshaj qhov kub ntawm zinc, kwv yees li 907 degree) ua rau zinc txheej vaporize thiab khiav tawm tam sim ntawd. Tib lub sijhawm, zinc molten reacts nrog oxygen los tsim cov zinc oxide hmoov dawb uas npog cov npoo npoo. Qhov tseem ceeb tshaj, thaum cov zinc txheej raug hlawv tawm, cov hlau uas muaj cov substrate poob cov electrochemical tiv thaiv ntawm thawj galvanized txheej. Yog tias tsis muaj kev kho mob tom ntej, lub vuam seam dhau los ua qhov pib ntawm corrosion ntawm tag nrho cov qauv, sai sai ua rau xeb thiab txawm tias muaj kev nyab xeeb ntawm cov qauv. Yog li ntawd, kev kho cov vuam seam yog ib qho tseem ceeb los kho qhov qub tag nrho los tiv thaiv -corrosion kev ua tau zoo ntawm galvanized kauj.
2. Dab tsi yog qhov kev tiv thaiv zoo tshaj plaws - kev kho corrosion rau galvanized coil welds? Lawv cov yam ntxwv yog dab tsi?
A: Muaj ntau yam kev tiv thaiv- kev kho corrosion rau galvanized coil welds. Qhov kev xaiv yuav tsum ua tib zoo xav txog cov qib ib puag ncig corrosion, nqi peev nyiaj, thiab kev tsim kho. Cov kev siv tau zoo thiab muaj xws li: Kev kho txias galvanizing txheej yog qhov kev xaiv yooj yim tshaj plaws. Nws siv high-purity zinc hmoov txheej nrog zinc cov ntsiab lus tsis tsawg dua 92% mus rau 96%, siv los ntawm txhuam los yog txau. Kev tiv thaiv cathodic ntawm zinc hmoov ua tiav kev tiv thaiv corrosion, haum rau sai ntawm - kho qhov chaw. Txau zinc kho siv cov cuab yeej tshwj xeeb los txau cov zinc hlau rau ntawm qhov chaw vuam siv hluav taws xob los yog nplaim taws. The resulting zinc coating has good density and strong adhesion, with a service life of over ten years, making it the best method for scenarios with high corrosion resistance requirements. Epoxy zinc-nplua nuj primer ua ke nrog topcoat yog tsim rau pob nyiaj siv - txwv los yog tsis - ib puag ncig corrosive hnyav. Ua ntej, siv cov epoxy zinc-nplua nuj primer nrog zinc hmoov cov ntsiab lus tsis tsawg dua 80% los muab kev tiv thaiv cathodic, tom qab ntawd npog nrog polyurethane lossis fluorocarbon topcoat los txhim kho huab cua tiv thaiv thiab zoo nkauj. Tag nrho cov yeeb yaj kiab qhuav yog pom zoo kom tsawg kawg yog 120 micrometers. Tsis tas li ntawd, nyob rau hauv lub galvanized coil nruas thiab muaj peev xwm tsim kev lag luam, aluminium paste kho txheej los yog kub yaj tin kho txoj kev kuj siv.
3. Thaum xaiv cov txheej txheem kho rau galvanized coil welds, yuav tsum xav txog dab tsi tseem ceeb ntawm kev ntsuas?
A: Thaum xaiv cov txheej txheej kho, zinc hmoov cov ntsiab lus, adhesion, durability, thiab zaj duab xis thickness yog cov cim tseem ceeb rau kev tsom mus rau. Ua ntej, zinc hmoov cov ntsiab lus yog cov tseem ceeb parameter txiav txim siab cathodic tiv thaiv nyhuv. Raws li cov txheej txheem tshwj xeeb, zinc hmoov cov ntsiab lus ntawm kub -dip galvanized kho txheej yuav tsum tsis pub tsawg dua 90%. Cov khoom siv siab tshaj -cov khoom lag luam zoo hauv khw feem ntau muaj zinc cov ntsiab lus ntawm 92% thiab 96%. Cov ntsiab lus siab dua, qhov ntev dua qhov kev tiv thaiv anodic sacrificial. Qhov thib ob, kev sib raug zoo ntawm txheej txheej txheej yog qhov tseem ceeb; primer thiab topcoat yuav tsum muaj zoo compatibility. Nws yog ib qho tsim nyog sau cia tias epoxy zinc{11}} nplua nuj lossis epoxy zinc daj primer tshuab tsis tuaj yeem siv nrog alkyd topcoats, vim alkaline zinc txheej yuav dhau los ua cov tshuaj tiv thaiv saponification nrog cov xim alkyd, ua rau zaj duab xis tev thiab ua tsis tiav. Hais txog cov qauv kev, qhov tseem ceeb yuav tsum tau muab rau cov khaub thuas{13}}dip galvanizing txheej uas ua tau raws li ASTM A780 lossis ISO 12944 cov ntawv pov thawj, nrog rau cov khoom siv epoxy primer tau lees paub los ntawm ISO cov qauv, kom ntseeg tau tias lawv cov txiaj ntsig tseem ceeb xws li cov tshuaj tsuag ntsev, kev cuam tshuam, thiab adhesion ua tau raws li cov qauv.
4. Dab tsi yog cov kauj ruam kev tsim kho thiab cov ntsiab lus tseem ceeb ntawm kev tiv thaiv - kev kho corrosion rau galvanized coil welds?
A: Cov txheej txheem tsim kho tus qauv yog qhov tseem ceeb rau lub sijhawm ntev - txhim khu kev qha los tiv thaiv - cov nyhuv corrosion ntawm welds. Nws feem ntau ua raws li peb txoj hauv kev - kauj ruam: "tu → ntxuav → txheej." Thawj kauj ruam yog kev ntxuav saum npoo: Siv lub kaum sab xis nrog cov hlau txhuam los yog lub log txhuam kom huv si kom tshem tawm cov vuam slag, tawg, hlawv - tawm oxidized zinc txheej, thiab zinc oxide residue los ntawm thaj chaw weld kom txog rau thaum cov hlau nplaum ntawm lub substrate raug. Rau cov ntawv thov uas xav tau txheej txheej adhesion ntau dua, sandblasting rau Sa2.5 tus qauv yog pom zoo, nrog rau qhov roughness ntawm Rz30 txog 75 microns yog qhov zoo. Cov kauj ruam thib ob yog kev ntxuav thiab degreasing: Ua tib zoo so cov hlau uas huv huv nrog acetone los yog ib lub tshuab ntxhua khaub ncaws tshwj xeeb kom tshem tawm cov roj thiab hmoov av, kom tsis txhob muaj kab mob. Cov kauj ruam thib peb yog txheej txheej: Siv cov tshuaj tiv thaiv tiv thaiv{12}} txheej txheej sib npaug rau cov vuam thiab cua sov- thaj chaw cuam tshuam siv tshuaj tsuag lossis txhuam hniav (feem ntau, nws raug nquahu kom npog 5 cm ntawm txhua sab ntawm lub vuam). Cov zaj duab xis qhuav ntawm cov primer yuav tsum tau tswj kom siab tshaj 80 microns. Tom qab txheej txheej yog thov, nws yuav tsum tau sab laug kom kho tau tag nrho. Lub sijhawm kho yog feem ntau 24 teev. Nyob rau lub sijhawm no, nws yuav tsum tsis txhob kov dej lossis raug cuam tshuam rau cov neeg kho tshuab.
5. Dab tsi yog qhov tsis zoo ntawm cov khoom siv los tiv thaiv -corrosion ntawm galvanized coil welds? Yuav ua li cas tswj thiab tshuaj xyuas zoo?
A: Feem ntau cov khoom tsis zoo hauv cov khoom siv los tiv thaiv kev sib tsoo yog feem ntau suav nrog cov txheej txheem tsis txaus, qhov pores thiab pinholes hauv cov xim zaj duab xis, thiab cov xim tsis sib xws. Cov adhesion tsis zoo feem ntau tshwm sim los ntawm kev ua tsis tiav ntawm qhov chaw tu lossis tsis ua kom tshem tawm cov roj stains, tiv thaiv cov txheej txheem los ntawm kev ua kom muaj zog nrog cov substrate. Pores thiab pinholes feem ntau muaj feem xyuam rau cov txheej txheem tsis sib xws, cov av noo ntau dhau hauv kev tsim kho ib puag ncig, lossis siv cov txheej tuab dhau ib zaug. Cov teeb meem no tuaj yeem dhau los ua txoj hauv kev rau corrosive media nkag mus, txo qhov kev tiv thaiv-corrosion effect. Hais txog kev tswj xyuas zoo thiab kev tshuaj xyuas, ib puag ncig yuav tsum tau tswj xyuas thaum lub sijhawm tsim kho. Qhov kub yuav tsum tau khaws cia ntawm 5 txog 35 degree, thiab cov av noo qis dua 80%. Kev ua haujlwm sab nraum zoov yuav tsum zam thaum huab cua los nag lossis cua. Cov txheej adhesion tuaj yeem kuaj tau siv tus ntoo khaub lig-txiav txoj kev 24 teev tom qab kev tsim kho. Yog tias thaj chaw loj ntawm cov xim zaj duab xis tev tawm, nws yuav tsum tau rov ua dua. Ib txhij, yuav tsum tau siv cov zaj duab xis qhuav thickness gauge los ntsuas cov txheej thickness ntawm ntau lub ntsiab lus nyob rau hauv lub vuam thiab cua sov- cuam tshuam cheeb tsam kom ntseeg tau tias cov thickness ntawm txhua qhov ntsuas tau ua tau raws li cov qauv tsim, kom tsis txhob plam qhov chaw lossis cov yeeb yaj kiab tsis txaus. Kev saib xyuas tsis tu ncua kuj tseem ceeb. Nws raug nquahu kom ua qhov kev tshuaj xyuas qhov muag thiab kev soj ntsuam adhesion ntawm thaj chaw recoated txhua txhua rau lub hlis mus rau ob xyoos txhawm rau txheeb xyuas thiab kho cov kev puas tsuaj tam sim ntawd.