Aluminium (Al), nrog lub ntsej muag silvery-dawb thiab lub ntsej muag-centered cubic qauv, muaj ib tug lattice tas li ntawm 404959.6 nanometers, ib tug txheeb ze atomic mass ntawm 26.8, ib tug melting point ntawm 658 degree, thiab ib tug boiling point ntawm 2000 degree. Aluminium tsis muaj nyob rau hauv kev lag luam zinc; es, nws yog txhob txwm ntxiv thaum kub-dip galvanizing txheej txheem. Lub hom phiaj ntawm kev ntxiv cov txhuas yog txhawm rau txhim kho qhov ci ntawm zinc txheej ntawm cov kav hlau, txhim kho lawv qhov yooj yim, hloov cov qauv ntawm cov hlau-zinc alloy txheej, thiab tiv thaiv cov teebmeem ntawm cov hlau hauv cov zinc molten. Cov no tau piav qhia hauv qab no:
(1) Aluminium Enhances Gloss thiab Flexibility ntawm Galvanized Steel Pipes
Raws li txoj cai, kom ua tiav cov hom phiaj no, cov ntsiab lus txhuas ntawm tsuas yog {{0}} 02% hauv cov zinc molten txaus. Txawm li cas los xij, vim yog txhuas qhov cuam tshuam rau oxidation ntawm qhov chaw ntawm cov zinc molten, ib qho empirical txhuas ntxiv ntawm ib ncig ntawm 0.2% yog qhov tsim nyog los tswj 0.02% txhuas cov ntsiab lus hauv cov zinc molten. Aluminium muaj kev sib raug zoo rau cov pa oxygen, tsim cov alumina txheej uas zoo tiv thaiv oxygen diffusion, tiv thaiv lub hauv paus molten zinc thiab molten zinc los ntawm oxidation. Ib yam li ntawd, lwm cov ntsiab lus hlau hauv cov zinc molten kuj tseem tiv thaiv los ntawm oxidation. Oxidized zinc, lead, thiab cadmium yog daj, thiab tsis muaj txhuas, txheej galvanized yuav ho muaj cov khoom daj, cuam tshuam rau nws cov gloss. Yog li ntawd, ib co nyiaj ntawm txhuas yog ntxiv thaum kub-dip galvanizing kom tau ib tug kaj galvanized txheej. Tsis tas li ntawd, thaum cov zinc molten muaj 0.2% txhuas, cov qauv zoo tshaj plaws tau txais, thiab qhov yooj yim ntawm cov txheej galvanized yog qhov zoo.
Txawm li cas los xij, American Society for Testing and Materials pom zoo kom tsis txhob siv txhuas los ua cov khoom siv hlau ci ci, thiab yog tias siv, nws yuav tsum txwv qis dua 0.01%.
(2) Hloov cov qauv ntawm Galvanized txheej
Raws li txoj cai, los hloov cov qauv ntawm txheej galvanized, ib qho txhuas cov ntsiab lus ntawm {{0}}.2 rau 0.3% nyob rau hauv cov zinc molten yog txaus. Txawm li cas los xij, hauv kev tsim khoom, aluminium yooj yim reacts nrog oxygen nyob rau hauv molten zinc thiab noj, yog li ib qho txhuas ntxiv ntawm ib ncig ntawm 1.5% mus rau 3.5% yog qhov tsim nyog los tuav cov ntsiab lus txhuas ntawm 0.2 mus rau 0.3%. Txhawm rau nthuav qhia cov txiaj ntsig ntawm cov ntsiab lus ntawm txhuas ntawm cov txheej txheem galvanized, cia peb tshuaj xyuas cov kev hloov pauv hauv cov txheej txheem galvanized raws li cov ntsiab lus txhuas nce:
Kev nce hauv cov ntsiab lus ntawm txhuas rau 0.05% hauv cov zinc molten txhim kho qhov gloss ntawm txheej galvanized tab sis tsis cuam tshuam rau nws cov qauv. Yog li ntawd, cov qauv galvanized yog tib yam li cov uas tau los ntawm cov zinc molten ntshiab, muaj cov txheej txheem adhesion (theem a), txheej nruab nrab (theem), txheej txheej me ntsis tawg (theem δ₁), txheej txheej ntab (theem S), thiab ib txheej zinc ntshiab (theem η). Qhov txawv ntawm galvanized txheej plated tawm los ntawm cov ntshiab molten zinc yog nyob rau hauv crystalline duab ntawm cov theem.
Thaum cov ntsiab lus txhuas nyob rau hauv cov zinc molten yog 0.1%, cov muaju ntawm cov txheej txheem ntab (theem S) muaj nyob rau hauv cov blocks loj thiab tsis muaj txheej txheem txuas ntxiv lawm tab sis raws li kev sib cais.
Thaum cov ntsiab lus txhuas hauv cov zinc molten yog 0.15%, qhov kev faib tawm ntawm cov txheej ntab ntab (theem S) kuj tsis tas mus li tab sis muaj ntau dua, sib cais sib cais crystalline pawg, tsuas yog cov txheej (theem δ₁) qhia ib tug me ntsis denser qauv.
Thaum cov ntsiab lus txhuas hauv cov zinc molten yog 0.24%, qhov cuam tshuam ntawm inhibiting etching (alloying) muaj zog. Yog hais tias lub galvanizing tau ua nyob rau ntawm qhov kub ntawm 440 degree rau 1 teev nyob rau hauv no molten zinc thiab tom qab ntawd soj ntsuam, tsis muaj cov tshuaj tiv thaiv. Yog li ntawd, tsuas yog ib txheej zinc ntshiab muaj nyob ntawm tus qauv galvanized. Qhov no yog vim hais tias cov tshuaj tiv thaiv ntawm txhuas thiab hlau ua ib zaj duab xis nyias ntawm FeAl₃ (los yog Fe₂Al₅ raws li qee qhov chaw), uas cuam tshuam cov diffusion ntawm hlau ions ntawm zinc.
Los ntawm cov saum toj no, tus nqi ntawm txhuas yog ib qho tseem ceeb hauv kev hloov cov qauv ntawm cov txheej galvanized. Thaum cov ntsiab lus ntawm txhuas yog tsau, cov txheej txheem tsis xws li lub sij hawm galvanizing, fluidity (raws li qhia hauv daim duab 3-5), thiab galvanizing kub kuj cuam tshuam qhov kev hloov ntawm zinc txheej txheej. Yog li ntawd, nyob rau hauv kub-dip galvanizing ntau lawm, kev sib raug zoo ntawm peb yam yog teev los ntawm cov txheej txheem specifications, thiab tsuas yog nyob rau hauv nruj tswj kev khiav hauj lwm tej yam kev mob yuav tau cov yam xav tau galvanized txheej.
(3) Tiv thaiv cov teebmeem ntawm Hlau hauv Molten Zinc
Aluminium reacts nrog hlau nyob rau hauv molten zinc los ua peb lub tebchaw: FeAl, FeAl₂, thiab FeAl₃, yog li txo nws cov kev cuam tshuam rau cov galvanized txheej.
