Titanium yog cov hlau uas muaj corrosion-resistant heev. Raws li cov ntaub ntawv thermodynamic ntawm titanium, nws yog thermodynamically tsis ruaj khov. Yog tias titanium yaj los ua Ti2+, nws cov qauv electrode muaj peev xwm tsis zoo (-1.63V), thiab nws qhov chaw ib txwm npog los ntawm cov yeeb yaj kiab oxide passive. Yog li ntawd, lub peev xwm ruaj khov ntawm titanium yog hloov mus rau qhov muaj txiaj ntsig zoo. Piv txwv li, hauv dej hiav txwv ntawm 25 degree, qhov ruaj khov ntawm titanium yog kwv yees li +0.09V. Cov phau ntawv qhia tshuaj thiab cov phau ntawv qhia muaj ntau yam ntawm cov qauv electrode muaj peev xwm sib xws rau cov tshuaj tiv thaiv titanium electrode. Nws yog ib qho tseem ceeb kom nco ntsoov tias cov ntaub ntawv no tsis raug ntsuas ncaj qha thiab feem ntau suav los ntawm cov ntaub ntawv thermodynamic. Cov peev txheej sib txawv tuaj yeem sawv cev rau ntau qhov sib txawv electrode, uas ua rau muaj kev hloov pauv hauv cov ntaub ntawv tshaj tawm.
Cov ntaub ntawv muaj peev xwm electrode ntawm titanium qhia tau hais tias nws qhov chaw muaj zog heev thiab feem ntau them los ntawm ib qho kev tsim oxide zaj duab xis. Yog li ntawd, qhov zoo heev corrosion kuj ntawm titanium tshwm sim los ntawm lub xub ntiag ntawm ib tug ruaj khov oxide zaj duab xis nrog zoo adhesion thiab tiv thaiv cov khoom ntawm nws nto. Qhov kev ruaj ntseg ntawm no tej yam ntuj tso oxide zaj duab xis txiav txim siab corrosion kuj ntawm titanium. Titanium thiab titanium alloys, nrog rau titanium rods, xov hlau, thiab nplooj ntawv, muaj zog corrosion kuj. Txawm li cas los xij, kev tiv thaiv corrosion tuaj yeem sib txawv ntawm cov qib sib txawv, raws li tau hais hauv peb lub vev xaib dhau los.
Hauv kev xav, P / B piv ntawm cov yeeb yaj kiab oxide tiv thaiv yuav tsum ntau dua 1. Yog tias nws tsawg dua 1, oxide zaj duab xis tsis tuaj yeem npog tag nrho cov hlau nto, yog li tsis muaj kev tiv thaiv. Yog tias qhov sib piv siab dhau lawm, qhov kev ntxhov siab hauv cov oxide zaj duab xis nce, ua rau nws yooj yim tawg thiab poob nws cov txiaj ntsig tiv thaiv. P / B piv ntawm titanium nyob ntawm seb muaj pes tsawg leeg thiab cov qauv ntawm cov oxide zaj duab xis thiab feem ntau poob ntawm 1 thiab 2.5. Los ntawm qhov kev pom yooj yim no, titanium oxide zaj duab xis tuaj yeem muaj cov khoom tiv thaiv zoo dua.
Thaum lub npoo ntawm titanium raug rau cov cua los yog cov kua dej aqueous, cov oxide zaj duab xis tshiab tam sim ntawd tsim. Piv txwv li, nyob rau hauv chav tsev kub, cov oxide zaj duab xis nyob rau hauv cov huab cua muaj ib tug tuab ntawm 1.2-1.6 nm thiab maj mam thickens lub sij hawm. Tom qab 70 hnub, nws ib txwm thickens mus rau 5 nm. Tom qab 545 hnub, nws maj mam nce mus rau 8-9 nm. Kev txhim kho oxidation tej yam kev mob (xws li cua sov, siv oxidizing neeg ua hauj lwm, los yog ua anodization) yuav ua rau kom txoj kev loj hlob ntawm nto oxide zaj duab xis, uas ua rau ib tug kuj tuab oxide zaj duab xis thiab txhim kho corrosion kuj ntawm titanium. Yog li, anodized thiab thermally oxidized oxide films ho txhim kho corrosion kuj ntawm titanium. Peb cov neeg siv khoom tau siv peb cov titanium rods thiab xov hlau los tsim ntau yam khoom zoo sib xws, lees paub cov lus qhia no.
Cov oxide zaj duab xis ntawm titanium (xws li thermally tsim thiab anodized films) feem ntau tsis yog ib tug qauv, thiab nws muaj pes tsawg leeg thiab cov qauv sib txawv nrog rau kev tsim.
titanium bar
titanium fiber ntau
titanium electrode phaj
