Ua ntej, cov tseev kom muaj kev pom dub thiab formula
Nyob rau hauv cov pa blackening, qhov kub ntawm cov dej ua kua yuav tsum tswj ntawm 138-146 ° C, thiab lub sij hawm tsaus ntuj yuav tsum yog 20-30 min. Thaum twg blackening, cov fasteners yuav tsum muab tso rau hauv nruab nrab ntawm da dej thiab cov fasteners yuav tsum tsis txhob raug nyob rau hauv cov kua li los yog ze rau hauv qab ntawm lub tank. Nws cov mis: sodium hydroxide (NaOH) 650-700g / L, sodium nitrite (NaNO2) 70-75g / L, trisodium phosphate (Na3PO4 • 12H2O) 80g / L. Qhov sib piv ntawm sodium hydroxide (NaOH) thiab sodium nitrite (NaNO2 ) yog qhov zoo tshaj (8-12): 1. Cov pa roj qes siv tsawg dua ntawm qhov ntsuas kub, thiab qhov siab tshaj ntawm qhov sib piv yog tsim nyog.
Thib ob, qhov loj tseem ceeb nyob rau hauv tus txheej txheem ntawm blackening
(1) Liab-xim av xeb nyob ntawm qhov dub ntawm qhov dub.
(2) Cov xim ntawm cov yeeb yam blackened yog daj ntseg.
(3) Qhov liab ntawm qhov chaw dub.
(4) Lub qhov dub ntawm qhov dub yog xim ntsuab thiab xim tsis sib luag.
Thib peb, qhov ua rau kev ntxub ntxaug thiab kho
(1) Thaum cov ntsiab lus ntawm oxidant (NaNO2) tsis txaus, qhov degree ntawm corrosion nce, thiab hlau hydroxide (Fe (OH) 3) xim liab xim xeb tshwm sim. Hauv qhov no, ntxiv ib qho oxidant uas tsim nyog (NaNO2) thiab ntxiv dej kom txo tus da dej.
(2) Thaum twg da dej kub tsis txaus thiab oxidation tsis txaus, cov blackening zaj duab xis yuav thim xim. Nyob rau lub sij hawm no, raws li qhov kev ntsuas tau, cov ntsiab lus ntawm cov dej da dej yuav tsim nyog kom puv nce, thiab yuav kub hnyiab tau.
(3) Thaum twg da dej kub dhau lawm thiab cov ntsiab lus ntawm corrosive agent (NaOH) ntau dhau lawm, liab liab yuav tshwm sim rau sab npoo dub ntawm lub transmitter. Lub sijhawm no, lub tank yuav tsum nruj nruj, thiab qhov sib piv ntawm sodium hydroxide (NaOH) thiab sodium nitrite (NaNO2) yuav tsum nruj me ntsis tswj. Qhov sib piv tsis tau ntau tshaj 12: 1.
(4) Thaum twg da dej kub tsis txaus, cov nqi ntawm qhov chaw siab dhau heev, thiab qhov chaw da dej tsawg tsawg, ntsuab yuav tshwm sim rau ntawm qhov tsaus ntuj, thiab xim yuav tsis ncaj. Nyob rau lub sij hawm no, yuav tsum tau nce siab thiab da dej kom tsawg