1.What yog cov ntsiab cai thiab zinc txheej cov yam ntxwv ntawm kub - dip galvanized steel kav?
Cov txheej txheem hauv paus ntsiab lus: tus yeeb nkab steel yog raus hauv Molten Zinc ntawm kwv yees li 500 degree. Kev siv tshuaj lom neeg tshuaj tshwm sim ntawm cov yeeb nkab cov av, sib xyaw cov txheej txheem sib xyaw ua ke nrog cov hlau {}} cov txheej zinc alloy thiab ib txheej huv si zinc. Zinc Txheej Nta: Tuab Zinc Txheej (feem ntau 60-150μm), tsis muaj pinholes, thiab ib qho kev tiv thaiv kev tiv thaiv ntev ntev (nce txog 15-30 xyoos hauv chaw sab nraud).
2.What yog txheej txheem ntws ntawm kub - dip galvanized steel yeeb nkab?
Pretreatment: Tshem tawm impurities los ntawm cov yeeb nkab cov yeeb nkab yog qhov tseem ceeb rau kev ua kom zoo nkauj zinc txheej adóesion.
Pickling: So rau hauv hydrochloric acid (HCl) lossis sulfuric acid (hso₄) tshem tawm nto teev thiab xeb.
Rinsing: Rinsing Residual acid nrog dej huv los tiv thaiv corrosion ntawm cov yeeb nkab steel.
Flux: So rau hauv Flux Tshuaj Ntawm Zinc Chloride (ZMML₂) + ammoncl), tiv thaiv cov yeeb yaj kiab steel, tiv thaiv kev tiv thaiv theem nrab thiab txhim kho zinc wettability. Kub - dip galvanizing: lub pre {{{{{{ Cov hlau rau ntawm cov yeeb nkab steel sib luag kis nrog zinc daws:
Ua ntej, tus hlau - zinc alloy txheej (xws li cov txheej, thiab lwm yam ntawm tag nrho cov txheej toinc thiab lwm yam ntawm cov yeeb nkab
Tom qab ntawd, ib txheej dawb huv si zinc dhau txheej txheej alloy, kev suav nyiaj rau kwv yees li ob {{0}- "kev tiv thaiv thawj" kev tiv thaiv corrosion.
Post - Kev Kho Mob:
Txias: Tom qab tshem tawm ntawm zinc txheej, txias zinc txheej nrog dej txias lossis huab cua kom tiv thaiv oxidation.
Passivation: Hauv qee kis, ib qho kev kho mob passivation yog ua los tsim zaj duab xis passive ntawm cov npoo zinc, ntxiv kom haum corrosion.
Tshuaj xyuas: Cov txheej zinc yog tshuaj xyuas rau tuab, adhesion (hla - hat} Hatch simt), thiab cov tsos (rau ploj plating los yog blistering).
3.Qhov yog tus txheej txheem ntws ntawm txias - dip galvanized steel yeeb nkab?
Pretreatment: zoo ib yam li kub - dip galvanizing (pickling galvanizing (pickling thiab rinsing), tab sis tsis muaj kev xav tau rau flux.
Electrolytic Galvanizing: Cov yeeb nkab steel ua raws li cathode thiab zinc phaj ua raws li anode. Cov no tau muab tso rau hauv ib qho kev sib xyaw ua ke uas muaj zinc ions (xws li zinc chloride). Kev ua kom ncaj qha tam sim no yog siv, ua rau cov zinc ions nyiaj rau ntawm cov yeeb nkab steel, sib sau ib qho huv si zinc txheej.
Tshaj tawm {{0 {{{}} Kev kho mob: Kev tu thiab passivation (yog tias tsim nyog). Txawm li cas los xij, vim hais tias cov txheej zinc yog nyias, passivation yog ib qib tseem ceeb hauv kev txhim kho corrosion.
4.Qhov dab tsi yog qhov tseem ceeb ntawm galvanized steel kav?
Kev Tiv Thaiv Kev Tiv Thaiv Kev Tiv Thaiv Kev Tiv Thaiv: Lub peev xwm electrode ntawm zinc (-0.76v) yog qis dua li ntawm hlau (-0.44V). Thaum tsis xws luag xws li khawb lossis ploj plating tshwm sim rau ntawm cov yeeb nkab cov yeeb nkab, cov zinc corrodes (los ua "kev tiv thaiv hlau los ntawm xeb los ntawm kev hloov chaw tam sim no.
Kev tiv thaiv lub cev tiv thaiv: Ib txheej zinc tiav (tshwj xeeb yog cov tuab nyob rau hauv kub {{}} DEJ
5.Qhov dab tsi yog cov kev txwv ntawm galvanized steel kav?
Corrosion tsis kam muaj qhov chaw siab tshaj plaws: lub zinc txheej nrawm nrawm (xws li muaj zog acid
Txias - dip galvanizing muaj cov teeb meem tseem ceeb: lub zinc txheej tsis muaj xeb, ua rau nws raug rau sab nraud lossis huab cua ib puag ncig rau ncua sijhawm. Kub - dip galvanizing tau maj mam hloov nws (txias- dip galvanizing kuj tseem tsis tau muaj qee qhov chaw ib puag ncig).
Cov siab tsis zoo - kub kev ua tau zoo: Zinc muaj qhov taw tes melting ntawm tsuas yog 419 degree. Thaum temperatures ntau dua 200 degree, zinc txheej softens thiab flakes tawm, plam nws txoj kev tiv thaiv corrosion. Yog li ntawd, nws tsis haum rau high- qhov ntsuas dej kub (xws li cov kav dej chav).