I. Txheej txheem cej luam ntawm Galvanized kav
Txhawm rau txhim kho corrosion kuj ntawm cov kav hlau, lawv raug rau cov txheej txheem galvanizing. Galvanized kav (galvanized steel kav) muab faib ua kub-dip galvanized thiab txias-galvanized hom. Cov kav dej kub-dip galvanized muaj cov tuab tuab, cov txheej txheej nrog cov adhesion muaj zog thiab ua haujlwm ntev. Hauv qhov sib piv, cov kav dej txias-galvanized, txawm tias lawv cov nqi qis dua, muaj qhov ntxhib ntxhib thiab tsis zoo corrosion kuj piv rau cov kav dej kub-dip galvanized, uas ua rau lawv cov theem qis dua.
Hauv cov tsev qub hauv Suav teb, cov kav dej galvanized tau siv dav, thiab lawv tseem yog cov kev xaiv rau cov kav dej thiab cov kav dej cua sov. Txawm li cas los xij, raws li cov kav dej, cov kav dej galvanized khaws cov xeb thiab teev nyob rau lub sijhawm, ua rau muaj kab mob sib kis thiab txhawb nqa cov kab mob loj hlob ntawm lawv cov phab ntsa ntxhib. Ntau qhov txaus ntshai, corrosion tuaj yeem nce qib hlau hnyav hauv dej, ua rau muaj kev phom sij loj. Hauv xyoo 1960 thiab 1970, qee lub tebchaws tsim tau pib tsim cov khoom siv yeeb nkab tshiab thiab maj mam txwv tsis pub siv cov kav dej galvanized. Ib yam li ntawd, Tuam Tshoj Lub Tsev Haujlwm Saib Xyuas Kev Tsim Kho thiab peb lwm lub chaw haujlwm tau tshaj tawm txwv tsis pub siv cov kav dej galvanized txij li xyoo 2000 mus ntxiv. Tam sim no, cov kav dej txias hauv cov chaw tsim kho tshiab tsis tshua siv cov kav dej galvanized, thaum qee cov kav dej kub tseem ua.
Galvanized kav dej tau muab faib ua cov kav dej kub-dip galvanized steel kav thiab cov kav dej txias-galvanized steel kav, nrog rau cov tom kawg yog phased tawm.
Kub-dip Galvanized Yeeb Nkab / Kub-dip Galvanized Steel Pipes
Kub-dip galvanizing yuav reacting molten hlau nrog ib tug hlau substrate los tsim ib tug alloy txheej, yog li bonding lub substrate thiab txheej. Cov txheej txheem tsim khoom pib nrog pickling cov yeeb nkab steel kom tshem tawm cov hlau oxide ntawm nws qhov chaw, ua raws li kev ntxuav hauv da dej ntawm ammonium chloride lossis zinc chloride tov (los yog ob qho tib si sib xyaw). Tom qab ntawd cov yeeb nkab yog immersed nyob rau hauv ib tug kub-dip galvanizing da dej.
Cov kav dej kub-dip galvanized steel kav muaj kev cuam tshuam lub cev thiab tshuaj lom neeg ntawm cov hlau substrate thiab molten txheej, uas ua rau corrosion-resistant, nruj bonded zinc-hlau alloy txheej. Cov txheej txheej txheej no yog kev sib xyaw nrog cov zinc txheej ntshiab thiab cov hlau substrate, muab kub-dip galvanized steel kav zoo xws li txheej txheej, muaj zog adhesion, thiab kev pab lub neej ntev.
Cold-galvanized Pipes / Cold-galvanized Steel Pipes
Txias-galvanizing, tseem hu ua electro-galvanizing, tsim cov zinc txheej tsawg kawg nkaus ntawm tsuas yog 10-50g / m2, uas ua rau muaj qhov tsis zoo corrosion kuj piv rau cov kav dej kub-dip galvanized. Reputable galvanized yeeb nkab manufacturers feem ntau tsis txhob electro-galvanizing (txias-galvanizing) kom zoo. Tsuas yog me me, cov chaw qub qub xaiv rau txoj kev no vim nws tus nqi qis dua. Nyob rau hauv cov kav dej txias-galvanized steel, zinc txheej yog nyias txheej ntawm cov hlau substrate thiab nws yooj yim rau detachment vim nws thinness, ua rau tsis zoo corrosion kuj. Yog li ntawd, cov kav dej txias-galvanized steel tau raug txwv tsis pub siv los ua cov kav dej thiab cov pa roj hauv cov chaw nyob tshiab.
