80. Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm kev siv zinc tshauv ntau zaus?

Thaum kub -dip galvanizing, zinc tshauv txheej (feem ntau zinc oxide) ntawm cov zinc molten nto thickens zuj zus. Kev ua tsis tiav cov khoom seem no ua rau cov pob dub los ntawm cov txheej txheem tsis zoo ntawm cov kav dej galvanized, ua rau cov khoom puas. Yog li ntawd, cov neeg ua haujlwm niaj hnub muab cov zinc tshauv los ntawm cov zinc molten. Hauv cov txheej txheem siv zinc chloride thiab ammonium chloride ua cov kuab tshuaj, cov hmoov tshauv raug khawb txhua 30 feeb. Rau cov txheej txheem uas siv hydrochloric acid ua cov kuab tshuaj, lub sijhawm ntuav yog txo rau 5-6 feeb. Qhov sib txawv no tshwm sim los ntawm cov kuab tshuaj sib txawv ntawm qhov sib txawv ntawm cov hmoov tshauv: lub qub tsim cov tshauv tsawg, thaum lub tom kawg generates ntau dua.
Hauv kub-dip galvanizing ntau lawm, tsim cov hlau-zinc alloy yuav tsum tau huv steel yeeb nkab substrate tsis muaj hlau oxide txheej thiab impurities kom ua tau zoo zinc txheej. Lub flux yog siv los tiv thaiv thiab ntxuav cov kua qaub- ntxuav cov yeeb nkab, tiv thaiv oxidation los ntawm atmospheric oxygen. Thaum cov yeeb nkab yog immersed nyob rau hauv molten zinc, lub flux disperses nto kab mob thaum tsim zinc tshauv thiab residual hnyav. Yog hais tias zinc tshauv tseem ceeb accumulates ntawm cov yeeb nkab inlet, lub flux yuav hlawv ua ntej. Txawm hais tias qee qhov hlawv, zinc tshauv tsis tuaj yeem tawg mus rau hauv cov zinc molten, tawm hauv cov hlau ntshiab substrate raug huab cua lossis tshauv. Qhov no ua rau kom ceev oxidation txheej tsim los yog hnyav residue tsub zuj zuj, ua rau cov pob dub los ntawm cov txheej tsis ploj. Yog li ntawd, tsis tu ncua tshem tawm zinc tshauv los ntawm molten zinc nto yog ib qho tseem ceeb kom muaj ib tug hlau luster ntawm cov yeeb nkab inlet. Los ntawm kev ua kom zoo ntawm cov txheej txheem pib, qhov kub -dip galvanizing txheej txheem lav zoo ib yam zinc txheej yam tsis tau plam txheej vim zinc tshauv lossis lwm yam kab mob.
Txawm li cas los xij, ntau cov tshauv scraping ua rau qee qhov tsis zoo. Thaum zinc tshauv raug muab tshem tawm, cov hlau nplaum ntawm cov kua zinc ua tau sai sai rau cov pa oxygen hauv huab cua nyob rau hauv siab - qhov kub thiab txias, tsim zinc tshauv. Nyob rau hauv cov ntaub ntawv ntawm aluminium-zinc kua, aluminium oxide kuj tsim. Yog li ntawd, ntau zaus cov tshauv yog scraped, ntau dua cov zinc tshauv generated, ua rau muaj zog zinc noj thiab cov nqi ntau dua. Yog li ntawd, cov neeg ua haujlwm paub txog tau tsim cov hmoov tshauv zoo tshaj plaws -scraping zaus los ntawm kev ua tau zoo.