Kev siv cov khoom siv titanium hauv Chemistry
Hauv kev lag luam tshuaj lom neeg ntawm qee lub tebchaws tsim peev, ntxiv rau kev siv ntau qib ntawm kev lag luam ntshiab titanium, alloy Ti ~ 0.2% Pd (hauv qab 5%) kuj tau siv dav.
Qee tus neeg xav tias daim ntawv thov kev siv zog siab corrosion-resistant Qib 5 Titanium Sheet yog ib qho tseem ceeb heev thiab cog lus nyob rau hauv kev tsim cov khoom siv siab, high-speed centrifuges thiab cov khoom sib cais. Muaj ntau txoj haujlwm mus rau thaj chaw no.
Qib 5 Titanium Sheetyog ib tug heev corrosion resistant hlau. Cov ntaub ntawv thermodynamic ntawm titanium qhia tau hais tias titanium yog ib qho thermodynamically tsis ruaj tsis khov hlau. Yog tias titanium tuaj yeem yaj los tsim Ti2+, nws cov txheej txheem electrode muaj peev xwm tsis zoo (-1.63V), thiab nws qhov chaw ib txwm npog nrog cov yeeb yaj kiab oxide passive. Nyob rau hauv txoj kev no, lub peev xwm ruaj khov ntawm titanium yog ruaj khov rau qhov muaj txiaj ntsig zoo, piv txwv li, lub peev xwm ruaj khov ntawm titanium hauv dej hiav txwv ntawm 25 degree yog hais txog +0.09V. Nyob rau hauv chemistry phau ntawv qhia thiab cov phau ntawv kawm, tus qauv electrode muaj peev xwm ua tau raws li cov tshuaj tiv thaiv titanium electrode tuaj yeem tau txais. Nws tsim nyog taw qhia tias qhov tseeb cov ntaub ntawv no tsis yog ntsuas ncaj qha, tab sis feem ntau tsuas yog xam tau los ntawm cov ntaub ntawv thermodynamic, thiab vim muaj cov ntaub ntawv sib txawv, cov ntaub ntawv sib txawv yuav tshwm sim rau ntau qhov sib txawv electrode cov tshuaj tiv thaiv uas yuav qhia tau tib lub sijhawm. Coj txawv txawv.
Cov ntaub ntawv muaj peev xwm ntawm electrode ntawm cov tshuaj tiv thaiv electrode ntawm titanium qhia tau hais tias nws qhov chaw muaj zog heev, thiab feem ntau yog ib txwm them nrog oxide zaj duab xis uas yog ib txwm tsim tawm hauv huab cua. Yog li ntawd, qhov zoo heev corrosion kuj ntawm titanium stems los ntawm qhov tseeb hais tias ib txwm muaj ib tug ruaj khov, heev nplaum, thiab tshwj xeeb tshaj yog tiv thaiv oxide zaj duab xis nyob rau saum npoo ntawm titanium. Qhov tseeb, nws yog qhov kev ruaj ntseg ntawm no ntuj oxide zaj duab xis uas txiav txim siab corrosion kuj ntawm titanium. Corrosion kuj, nrog rau titanium thiab titanium alloy titanium rods, titanium xov hlau, titanium daim hlau, thiab lwm yam. muaj zog corrosion kuj, ntawm chav kawm, corrosion kuj ntawm ntau hom yog txawv, peb tau hais nyob rau hauv lub dhau los cov ntsiab lus ntawm lub website Txawm li cas los xij, kuv yeej ' tsis hais ntau hnub no. Raws li kev hais lus, P / B piv ntawm cov yeeb yaj kiab oxide tiv thaiv yuav tsum siab dua 1. Yog tias nws tsawg dua 1, oxide zaj duab xis tsis tuaj yeem npog tag nrho cov hlau nto, yog li nws tsis tuaj yeem ua lub luag haujlwm tiv thaiv. Yog tias qhov piv txwv no loj dhau, qhov kev ntxhov siab hauv cov yeeb yaj kiab oxide yuav nce ntxiv, uas yuav yooj yim ua rau tawg ntawm oxide zaj duab xis thiab tsis tiv thaiv nws. P / B piv ntawm titanium yog nruab nrab ntawm 1 thiab 2.5 nyob ntawm seb muaj pes tsawg leeg thiab cov qauv ntawm oxide zaj duab xis. Los ntawm cov ntsiab lus tseem ceeb ntawm kev tsom xam, oxide zaj duab xis ntawm titanium tuaj yeem muaj kev tiv thaiv zoo dua.
Thaum qhov chaw ntawm titanium raug rau cov huab cua lossis cov kua dej aqueous, cov oxide zaj duab xis tshiab yuav raug tsim tam sim ntawd. Piv txwv li, lub thickness ntawm oxide zaj duab xis nyob rau hauv qhov chaw ntawm chav tsev kub yog 1.2 ~ 1.6nm, thiab nws yuav thicken nrog lub sij hawm. Tom qab 70 hnub, nws yuav thicken mus rau 5nm. Tom qab 545 hnub, nws maj mam nce mus rau 8 ~ 9nm. Artificially ntxiv dag zog rau oxidation tej yam kev mob (xws li cua sov, siv oxidants los yog anodic oxidation, thiab lwm yam.) tuaj yeem ua kom lub ntsej muag oxide zaj duab xis thiab tau txais cov yeeb yaj kiab oxide tuab, yog li txhim kho corrosion kuj ntawm titanium. Yog li ntawd, oxide zaj duab xis tsim los ntawm anodic oxidation thiab thermal oxidation yuav ua tau zoo heev txhim kho corrosion kuj ntawm titanium. Tam sim no peb cov neeg siv khoom tau ua ntau yam khoom zoo sib xws nrog peb cov titanium pas nrig thiab titanium hlau, uas qhia tau hais tias qhov no yog ib txoj hauv kev ua tau.
Vim tias titanium yog cov hlau uas kim heev, nws yuav tsum tau siv los ua cov khoom siv hauv cov khoom siv hlau. Nws twb muaj kev paub txog kev tsim cov khoom siv titanium-lined nrog txoj kab uas hla ntawm 3.6 meters thiab ntev ntawm 20 meters. Vim muaj qhov sib txawv ntawm qhov sib txawv ntawm thermal expansion ntawm titanium thiab hlau, qhov ntev ntawm ib feem ntau yuav tsum tsis pub tshaj 2 meters. Rau tib lub laj thawj, txoj kev no tsis tuaj yeem siv qhov twg qhov kub hloov pauv ib ntus. Vim tias qhov sib txawv me me ntawm lub plhaub hlau thiab cov titanium hauv ob sab phlu ntawm cov khoom siv titanium-lined, cov khoom siv no yuav tsum tsis txhob siv rau hauv lub tshuab nqus tsev thiab cov cua sov hloov mus rau qhov chaw.
Cov cuab yeej siv hluav taws xob siab kub siab tuaj yeem ua los ntawm steel clad nrog 2 hli titanium.
Qee lub tuam txhab hauv Tebchaws Meskas thiab Tebchaws Yelemees sab hnub poob siv cov vuam tawg los tsim cov titanium steel phaj thiab titanium-clad steel kav. Qhov siab tshaj plaws ntawm no titanium-coated phaj yog 2.5 meters, thiab shear zog ntawm titanium-coated txheej yog hais txog 250 MN / m2 (qhov tsawg kawg nkaus shear zog yog 140 MN / m2). Cov txheej feem ntau yog ua los ntawm cov ntshiab titanium lossis titanium-palladium alloy.
Kev tsim thiab siv cov kav dej titanium tau pom tias nyob rau hauv cov xwm txheej ntawm qhov kub thiab txias ntawm cov kav dej me me, kev siv cov kav dej titanium yog kev lag luam thiab txhim khu kev qha ntau dua li kev siv cov kav dej nrog cov titanium coatings. Txawm li cas los xij, rau cov kav dej uas muaj txoj kab uas hla ntau dua 500 mm, nws yog qhov zoo dua los siv cov kav dej titanium-coated.
Titanium monolithic qauv, nrog rau txhua kab rau kev siv nyob rau hauv siab K thiab siab kub (hauv qab 250 degree), tau txais kev txaus siab tshwj xeeb tsis ntev los no. Kev paub tau txais txiaj ntsig hauv kev tsim cov khoom siv titanium nrog phab ntsa thicknesses txog 25 hli.
Kev siv cov welded titanium raj yog ib qho tseem ceeb hauv kev txo tus nqi ntawm cov khoom siv hluav taws xob. Raws li cov ntaub ntawv tso tawm los ntawm American Titanium Corporation, uas tsim welded titanium raj, tus nqi ntawm welded titanium raj yog 20% pheej yig dua li seamless titanium raj.
Thin-walled titanium raj yog tsim tshwj xeeb rau cov khoom siv hluav taws xob. Txhawm rau nteg cov kav dej hauv Nyij Pooj, ntxiv rau kev tsim cov kav dej 6 × 300 mm, nws kuj tsim cov qauv tshwj xeeb zoo li cov fittings: tee kav, 90 thiab 45 kais dej, thiab cov kav dej sib txawv ntawm cov calibers sib txawv.
Thicker-walled tubes yog siv nyob rau hauv lub tshav kub exchangers tsuas yog thaum tsim nyog kiag li nyob rau hauv lub capitalist lub teb chaws. Piv txwv li, rau lub tubular cua kub exchanger nrog ib tug tsim siab ntawm 10 MPa nyob rau hauv lub inter-tube qhov chaw thiab ib tug xeem siab ntawm txog 14 MPa, ib tug seamless titanium raj nrog ib txoj kab uas hla ntawm 19.05 hli thiab phab ntsa thickness ntawm 1.8 hli yog ntsia.
Nws tuaj yeem pom tau tias hauv cov tebchaws tsim peev xws li Tebchaws Meskas, Canada, Nyiv thiab Western European lub tebchaws, daim ntawv thov cov yam ntxwv ntawm Qib 5 Titanium Sheet hauv kev lag luam tshuaj yog raws li nram no: dav siv tshwj xeeb-zoo li tus castings, thiab titanium alloy Ti. ~0.2 nrog zoo corrosion kuj %Pd; siv cov khoom siv hlau uas muaj titanium los yog coated nrog nyias titanium daim hlau; dav txhawb kev siv phaj kub exchangers; siv nyias-walled titanium raj hauv raj kub exchangers, thiab siv nyias titanium daim hlau nyob rau hauv cov khoom thiab cov khoom.
