Cov mis sawv cev feem ntau rau cov tshuaj chromate passivation tau siv rau ntau tshaj ob xyoo lawm. Tom qab lub sij hawm ntev ntawm kev ntsuam xyuas, nws tau ua pov thawj tias muaj txiaj ntsig thiab ua tau. Lub ntsiab lus tseem ceeb ntawm cov mis no yog tus nqi pheej yig sodium dichromate. Cov tshuaj tuaj yeem npaj tau los ntawm kev ntxiv ib qho ntawm cov concentrated sulfuric acid thiab dej rau sodium dichromate. Cov mis tshwj xeeb yog raws li nram no:
Sodium dichromate (Na₂Cr₂O₂·2H₂O): 0.4-0.6%;
Sulfuric acid (H₂SO₄) (98%): 0.1%;
Dej (H₂O): qhov seem.
Kuj tseem muaj cov tshuaj chromic acid passivation muaj xws li chromic anhydride, concentrated sulfuric acid, thiab dej, tab sis nws kim dua. Cov mis yog raws li nram no:
Chromic anhydride (CrO₃): 0 4-0.6%;
Sulfuric acid (H₂SO₄) (98%): 0.1%;
Dej (H₂O): qhov seem.
Qee lub tuam txhab ntxiv 4-5% sodium hydroxide (NaOH) rau cov mis no.
