Vim dej haus ntawm concentrated sulfuric acid, cov pa roj carbon cov roj cia rau hauv yuav tsum tau muaj kev tiv thaiv los ntawm kev ya raws thaum khaws cia. Kev haus luam yeeb tuaj yeem raug ntxiv rau lub tso plhaub taub hau. Loj cov roj carbon ntau cov dej khib nyiab tuaj yeem raug ntim nrog nitrogen kom rho tawm dej pa. Cov khib nyiab roj carbon (carbon deposit) yog siv los khaws cov concentrated sulfuric acid thiab kuj muaj feem xyuam nrog lwm yam kev mob.
Qhov kev kuaj ntawd ua pov thawj tias nyob rau ntawm ib qho kev ntsuas kub, qhov txhuam ntawm cov pa carbon rau dilute sulfuric acid nce nrog qhov nce ntawm concentration. Tom qab ncav cuag ib qho kev concentration, qhov corrosion rate decreases nrog cov nce ntawm concentration. Rau concentrated sulfuric acid nrog ib tug concentration saum toj 80% thiab ib tug kub ntawm tsawg tshaj li 60 ° C, carbon hlau thiab cam khwb cia hlau muaj zoo corrosion tsis kam, tab sis nws tsis haum rau ntws sulfuric acid.
Qhov loj feem feem ntau yog 70%. Concentration ntawm sulfuric acid ua rau passivation. Cov concentrated sulfuric acid yuav oxidize cov nplaim ntawm cov hlau tsim ib txheej oxide. Txij li thaum muaj me ntsis dej nyob rau hauv concentrated sulfuric acid, tsis muaj free ions. Cov txheej txheem oxide tsis yog oxidized thiab etched. Yog li, nws yog kiag li tau siv cov roj cia tso tsheb hlau luam, tiam sis nws yog ib qho tsim nyog kom tawm hauv ib qho nyiaj ntawm qhov nyiaj ntawm corrosion.
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