Niobium thiab tantalum feem ntau tshwm sim ua ke, tab sis cov ntsiab lus ntawm niobium nyob rau hauv lub ntiaj teb crust yog hais txog 2.4 × 10 -3%, uas yog 10 npaug ntawm tantalum, thiab nws tsuas yog muaj nyob rau hauv daim ntawv ntawm columbite. Feem ntau, qhov corrosion kuj ntawm niobium yog siab dua titanium thiab zirconium tab sis qis dua tantalum me ntsis. Txij li tus nqi ntawm niobium qis dua tantalum, niobium tuaj yeem siv los hloov cov tantalum kim dua hauv qee cov xov xwm corrosive. Nyob rau tib lub sijhawm, tus txheeb ze ntom ntom ntawm niobium tsuas yog kwv yees li 1/2 ntawm tantalum. Raws li qhov loj me me, qhov ntau npaum ntawm niobium tsuas yog kwv yees li 1/2 ntawm tantalum, uas tuaj yeem txo cov nqi.
Niobium, zoo li tantalum, tso siab rau kev tsim cov yeeb yaj kiab oxide ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Yog li ntawd, qhov corrosion kuj ntawm niobium yog ze rau ntawm tantalum. Niobium feem ntau yog siv rau hauv qee qhov muaj zog txo cov kua qaub tawm nrog qhov kub thiab txias. Txawm li cas los xij, nws tsis yog corrosion resistant nyob rau hauv hydrofluoric acid, kub concentrated sulfuric acid, sodium hydroxide, poov tshuaj hydroxide thiab lwm yam xov xwm. Nws tsis yog corrosion resistant nyob rau hauv kub concentrated hydrochloric acid thiab kub concentrated phosphoric acid. Tus nqi corrosion kuj tseem siab, yog li ceev faj yuav tsum tau siv thaum thov niobium hauv cov xov xwm no.
Kub taw tes ntawm niobium yog: 4927 degree, lub melting point yog: 2468 degree, nws yog ib tug refractory hlau. Niobium tuaj yeem molded ntawm nruab nrab kub ntawm 350 ~ 400 degree, kub molding ntawm 950 ~ 1000 degree, thiab tuaj yeem ua tiav tag nrho ntawm 1200 degree. Niobium pib oxidize hauv huab cua ntawm 230 degree, thiab pib oxidize zog ntawm 300 degree. Thaum qhov kub siab tshaj 400 degree, oxide zaj duab xis raug rhuav tshem thiab ntog tawm, ua kom lub zog oxidation zoo heev. Niobium pib nitride hauv huab cua ntawm 600 degree. Niobium yuav nqus cov hydrogen hauv qhov nruab nrab uas muaj hydrogen ntawm 250 degree ~ 950 degree.
