Cov ntsia hlau dub feem ntau yog siv los kho cov ntaub ntawv hauv qab lossis cov ntaub ntawv rov qab ntawm cov xim dub lossis lwm yam khoom siv hluav taws xob tsaus. Txhawm rau txo qis kev tswj cov khoom, cov ntsia hlau dub kuj tau siv hauv tshuab. Ib qho ntawm lawv yog cov txheej txheem oxide dub.
Oxidation dub muab faib ua qhov kub thiab txias blackening thiab kub kub blackening. Siv chav sov blackening ua piv txwv, cov txheej txheem ntws yog: tshuaj degreasing - dej kub ntxuav - dej txias ntxuav - xeb tshem tawm thiab acid etching - tu - blackening - tu - roj los yog over-sealing. Nws yog oxide zaj duab xis tsim los ntawm sodium hydroxide thiab sodium nitrite ntawm qhov kub ntawm ntau tshaj 100 degrees.
Cov khoom tseem ceeb ntawm cov oxide zaj duab xis yog Fe3C4, cov yeeb yaj kiab tsis sib xws tsuas yog 0 nkaus xwb. thaum nws tsis oily los yog kaw. Kwv yees li 3-4 teev tom qab oiling. Tsis muaj cov ntsia hlau siv cov txheej txheem no rau cov khoom siv hauv tsev me. Nyob rau hauv cov nqe lus ntawm tsos xim, oxide dub yog ze rau dub zinc thiab electrophoretic dub, tab sis tsis zoo li dub zinc thiab electrophoretic dub.
