Txoj kev kho cov hlau impurities hauv nickel plating da dej tov

Txoj kev kho cov hlau impurities hauv nickel plating da dej tov

(1) Yog hais tias muaj hlau impurities nyob rau hauv lub plating tov, thawj zaug siv reagent sulfuric acid kom txo cov pH nqi ntawm cov plating tov txog li 3, ces ntxiv 1-2 milliliters/liter ntawm 80% hydrogen peroxide, do lub plating. tov kom huv si, tos rau oxidation thiab decomposition rau 2-4 teev, cua sov mus rau 65-70, tsa tus nqi pH txog li 6 nrog ib tug dilute tov ntawm 20% sodium hydroxide, thiab txuas ntxiv stirring rau {{8} } teev. Ntawm no, raws li tus nqi pH ntawm sodium hydroxide los nag kuj txo, nws yog ib qho tsim nyog los ntsuas pH tus nqi ntau zaus, tswj tus nqi pH ntawm ib ncig ntawm 6, cia nws sawv ntsug rau 8-12 teev, thiab tom qab ntawd lim. Kho tus nqi pH hauv cov txheej txheem ib txwm muaj nrog reagent sulfuric acid, thiab tom qab ntawd sim plating.

Nyob rau hauv lub ci nickel plating da dej, thaum kho cov hlau impurities nrog hydrogen peroxide, kev kho mob ntawm cov organic impurities kuj yuav ua tau. Tom qab ntxiv hydrogen peroxide rau oxidation, 2-4 grams / litre ntawm cov pa roj carbon activated tuaj yeem muab ntxiv thaum nplawm, rhaub rau 65-70, sab laug kom sawv ntsug rau 8-12 teev, thiab tom qab ntawd lim. Txoj kev no tuaj yeem tshem tawm cov hlau thiab cov organic impurities hauv ib qho mus. Lub voj voog kho yog ib zaug txhua 3-4 hli

(2) Yog tias muaj chromium impurities hauv cov tshuaj plating, tus nqi pH ntawm cov tshuaj plating yuav tsum raug txo kom qis dua 3 siv reagent sulfuric acid. Thaum stirring, ntxiv cov hmoov pov hwm ntawm tus nqi ntawm 04-0.8 grams ib liter kom txo tau (nyob ntawm seb cov ntsiab lus hexavalent chromium). Tom qab ntawd, tsa tus nqi pH ntawm cov txheej txheem plating rau 5-6 siv 20% sodium hydroxide dilute tov (qib reagent) thiab ua kom sov rau 65-70. Tus nqi pH yuav tsum tau ntsuas thiab kho ntau zaus hauv ib qho kev nplawm tas li. Cia nws sawv ntsug rau 4-6 teev, lim thiab ntxiv 0.5-1.0 milliliters/liter ntawm 8O% hydrogen peroxide kom tshem tawm cov hmoov pov hwm ntau dhau. Kho tus nqi pH rau qhov ib txwm muaj nrog reagent sulfuric acid, thiab siv cov electrolysis tsawg tam sim no rau 2-4 teev los sim plating. Kuj tseem muaj txoj hauv kev tshem tawm chromium impurities, xws li txoj kev poov tshuaj permanganate thiab ferrous sulfate txoj kev, tab sis lawv yog ob qho tib si tsis zoo thiab tsis zoo li kev tuav pov hwm hmoov. Yog li ntawd, tam sim no, kev tuav pov hwm hmoov yog siv dav.

(3) Yog hais tias muaj hlau impurities xws li tooj liab nyob rau hauv lub plating tov, electrolytic kho nrog tsawg tam sim no ceev yog yooj yim dua.

Tus txheej txheem yog thawj zaug kho cov pH rau ib ncig ntawm 3 nrog reagent sulfuric acid, thiab do kom huv si siv ib tug npib tsib xee plated hlau phaj los yog qub hanging cuab tam (nrog rau thaj tsam ntau dua 4 npaug ntawm anode) raws li lub anode. Electrolyze ntawm qhov ceev tam sim no ntawm 0.5 mus rau 0.1 amperes ib decimeter rau 12 mus rau 24 teev.

Yog hais tias muaj ntau yam tooj liab impurities, cov khoom pov tseg thiab cov cuab yeej dai qub uas tau plated nrog cov npib tsib xee tuaj yeem muab tso rau hauv cov tshuaj nickel plating thiab dai kom txog thaum tooj liab hloov nrog cov xim liab ntshiab, qhia txog kev ua tau zoo. Tom qab ntawd, electrolysis uas tsis tshua muaj tam sim no tuaj yeem siv los ua kom tiav cov txiaj ntsig tseem ceeb.

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