52. Dab tsi yog qhov teeb meem tshwm sim los ntawm kev ziab ntawm cov kav hlau tsis txaus?

Thaum cov kav hlau tau qhuav tom qab tau coated nrog cov kuab tshuaj aqueous, yog tias lawv tsis ncav cuag qhov xav tau kom qhuav kub rau kub -dip galvanizing thiab khaws cov dej noo ntau dhau, qhov no yog cov kav hlau tsis huv. Qhov tshwm sim ntawm cov kav dej undried feem ntau suav nrog: (1) Ua tsis tiav tshem tawm hydrogen tsim thaum lub sij hawm acid pickling los ntawm cov hlau substrate, cuam tshuam galvanized txheej zoo; (2) Induced corrosion ntawm cov hlau substrate ua ferric chloride, nce zinc noj thiab ua rau cov ntxhib galvanized nto; (3) Aluminium Cheebtsam nyob rau hauv molten zinc nyob rau hauv khaus oxidation vim ya raws, generating ntau aluminium oxide (Al₂O₃) uas nkim txhuas thiab accelerates hnyav degradation; (4) Cov dej noo sai sai hloov mus rau hauv chav, hydrogen, thiab oxygen thaum sib cuag nrog cov zinc molten, ua rau tawg ntawm zinc kua los ntawm cov yeeb nkab kawg (ib qho xwm txheej txaus ntshai), uas ua rau cov zinc khib nyiab thiab tsim mottled txheej; (5) Chav tsim los ntawm cov dej noo reacting nrog molten zinc ntawm 350℃intensifies zinc oxidation, exacerbated los ntawm molten zinc qhov kub thiab txias ntawm 470-500 degree, thaum kawg nce zinc noj thiab degrading galvanized txheej zoo.