Chemical zog ntawm tungsten
Apr 02, 2026| Nyob rau hauv chav tsev kub, zoo ib yam li chromium thiab molybdenum, tungsten tsis corroded los ntawm huab cua. Ntawm qhov kub thiab txias, txawm li cas los xij, nws ua rau muaj kev cuam tshuam ntau dua rau corrosion, reacting nrog ntau nonmetals thiab feem ntau ua cov khoom interstitial thiab nonstoichiometric. Nyob rau hauv lub xub ntiag ntawm oxidizing neeg ua hauj lwm xws li KNO3 los yog KClO3, molten alkali sai corrodes tungsten rau tsim WO4²⁻.
Los ntawm qhov kev xav ntawm pawg chromium uas tungsten belongs, Mo thiab W zoo ib yam rau ib leeg thiab nthuav tawm qhov sib txawv tseem ceeb ntawm lub teeb pom kev zoo, Cr. Qhov no feem ntau yog tshwm sim nyob rau hauv cov txheeb ze stability ntawm lawv cov oxidation xeev, uas muaj xws li ntawm +6 mus rau -2. Kev ruaj ntseg ntawm oxidation xeev nyob rau hauv pawg no tau hais los saum no. Tsis tas li ntawd, txawm hais tias chromium (VI) nyiam tsim oxypolyacid anions, nws muaj ntau haiv neeg tsawg dua li ntawm polymolybdates thiab polytungstates. Lub +5 thiab +4 oxidation xeev feem ntau manifest li tsis ruaj tsis khov intermediates rau chromium; Thaum rau molybdenum thiab tungsten, lawv muab cov tshuaj aqueous tseem ceeb heev. Chromium qhov ruaj khov tshaj plaws oxidation xeev yog +3, thiab nws cov kev sib koom ua ke chemistry, uas tshwm sim los ntawm nws symmetrical t2g³ configuration, yog thib ob xwb rau cobalt (III) nyob rau hauv abundance, thaum tsis muaj ib feem nyob rau hauv lub chemistry ntawm molybdenum los yog tungsten.