Tswj cov impurities hauv alkaline zinc plating tov rau hluav taws xob cua sov raj

Tswj cov impurities hauv alkaline zinc plating tov rau hluav taws xob cua sov raj

Nws yog qhov zoo tshaj plaws los xaiv cov tshuaj ua kom zoo sodium hydroxide. Muaj qib sodium hydroxide yuav tsum tau dawb huv thiab tsis muaj impurities, thiab me ntsis daj los yog lub teeb liab sodium hydroxide yog qhov zoo tshaj plaws tsis siv. Zinc anodes yuav tsum siv high-purity zinc, feem ntau yog 0 # zinc ingot, txiav rau 9.9 feem pua. Tsawg purity zinc anodes muaj cov ntsiab lus siab ntawm impurities, uas tuaj yeem ua rau cov tshuaj plating ua haujlwm tsis zoo.

Lub purity ntawm zinc oxide yog 99.99 feem pua, nrog ob (Pb) stamens ntawm 0.002 feem pua ​​thiab ob (Cd) stamens ntawm 0.005 feem pua.

Kev xyaum tau pom tias cov txheej txheem tshiab alkaline zincate zinc plating, tsis hais nws cov kev daws teeb meem thiab txheej txheej, tau mus txog lossis dhau ntawm cyanide zinc plating. Txawm li cas los xij, feem ntau ntawm alkaline zincate zinc plating txheej txheem tseem yuav tsum tau txhim kho thiab txhim kho hauv cov hauv qab no:

(1) Piv nrog cyanide zinc plating los yog potassium chloride zinc plating, qhov dawb ntawm alkaline zincate zinc plating yog me ntsis qis dua thaum chromate dawb passivation yog siv. Ob peb cov khoom raug muab piv ua ke, thiab alkaline zinc ntsev txheej yog xim daj me ntsis, uas tsis ua raws li cov xim xim ntawm cyanide zinc plating thiab potassium chloride zinc plating.

(2) Piv nrog cyanide zinc plating los yog potassium chloride zinc plating, cov xim ntawm xiav dawb passivation txawv, thiab xiav dawb passivation zaj duab xis ntawm cyanide zinc plating txheej yog ib yam thiab meej; Lub xiav dawb passivation zaj duab xis ntawm poov tshuaj chloride zinc txheej yog lub ntuj kaj xiav xim; Thiab xiav dawb passivation zaj duab xis ntawm alkaline zinc ntsev zinc plating txheej feem ntau tsaus dua; Thiab txawm hais tias nws yog hexavalent chromium passivation los yog trivalent chromium passivation, xim xim ntawm xiav dawb passivation zaj duab xis tseem muaj qhov sib txawv ntawm lub ntuj xiav xim lub suab uas tib neeg tau siv los.

(3) Qee qhov (loj) yuav tsum tau txhaj tshuaj molding tom qab galvanizing thiab passivation, thiab cov tshuaj tsuag molding kub feem ntau yog siab tshaj 160 degree. Tam sim no, tsuas yog cov zaj duab xis passivation ntawm cyanide zinc txheej yog txau nrog cov yas, thiab nws cov khoom tsim nyog tus nqi tseem nyob saum 98 feem pua ​​(cov khoom tsis tsim nyog no feem ntau yog hais txog cov foaming tom qab txau); Txawm li cas los xij, alkaline zincate zinc txheej tsis tuaj yeem ua tiav qhov kev tsim nyog ntawm tag nrho. Txawm tias tom qab alkaline zinc ntsev galvanizing thiab ci ntawm 20 degree rau 1 teev, tus nqi ntawm cov khoom ua haujlwm tsis muaj foaming tseem siab dhau tom qab kev kho mob. Tau kawg, muaj ntau yam laj thawj, tab sis cov txiaj ntsig tsis tuaj yeem ua tiav cov txiaj ntsig zoo ib yam li cyanide galvanizing.

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