Dab tsi yog cov ntawv tshwj xeeb corrosion ntawm titanium?
Titanium yog ib qho tseem ceeb ntawm cov khoom siv hlau nrog zoo corrosion kuj. Txawm li cas los xij, nyob rau hauv qee qhov xwm txheej, titanium tseem yuav nthuav tawm qee cov ntawv tshwj xeeb corrosion, xws li crevice corrosion, pitting corrosion, galvanic corrosion, weld zone corrosion, hydrogen absorption thiab hydrogen embrittlement, thiab kev nyuaj siab corrosion cracking.
Kev txhim kho corrosionhais txog qhov tshwm sim corrosion tshwm sim los ntawm electrochemical cuam tshuam ntawm me me tsis xws luag los yog tawg nyob rau hauv cov ntaub ntawv titanium. Thaum muaj qhov tsis xws luag me me ntawm cov khoom siv titanium, cov pa oxygen hauv cov tshuaj yuav nkag mus rau qhov tsis xws luag, ua rau qhov tsis xws luag los ua ib qho anode, thiab qhov chaw nyob ib puag ncig titanium los ua cathode. Cov nyhuv galvanic no tuaj yeem ua rau qhov tshwm sim ntawm crevice corrosion thiab thaum kawg kev puas tsuaj ntawm cov khoom.
Pitting corrosionyog hais txog kev tsim cov pits hauv zos ntawm cov khoom siv titanium, feem ntau tshwm sim raws li qhov me me lossis kev nyuaj siab. Pitting corrosion feem ntau tshwm sim thaum muaj cov oxidants muaj zog xws li chloride ions lossis fluoride ions. Cov oxidants no yuav tsim cov oxide zaj duab xis rau ntawm titanium nto, tab sis ntawm qhov chaw tsis xws luag, cov oxide zaj duab xis yuav raug puas tsuaj, ua rau pitting corrosion.
Galvanic corrosion kujhais txog qhov tshwm sim corrosion uas tsim ntawm ob yam hlau sib txawv. Thaum titanium los rau hauv kev sib cuag nrog lwm cov hlau, lub roj teeb me me ua rau hauv cov tshuaj electrolyte, nrog titanium ua tus anode thiab lwm yam hlau ua lub cathode. Cov nyhuv galvanic no yuav ua rau corrosion ntawm titanium cov ntaub ntawv thiab ceev cov txheej txheem corrosion.
Weld cheeb tsam corrosionhais txog qhov tshwm sim corrosion ua thaum lub sij hawm vuam txheej txheem. Thaum lub sij hawm vuam, qhov kub thiab txias hauv cheeb tsam ntawm cov khoom titanium nce thiab nws yog ib qho yooj yim rau react nrog oxygen los yog lwm yam corrosive media nyob rau hauv ib puag ncig. Cov tshuaj tiv thaiv no tuaj yeem ua rau corrosion nyob rau hauv qhov chaw vuam thiab txo lub zog thiab sealing kev ua tau zoo ntawm cov welded sib koom.
Hydrogen absorption thiab hydrogen embrittlementxa mus rau qhov tshwm sim uas cov ntaub ntawv titanium ua nkig tom qab absorbing hydrogen. Titanium cov ntaub ntawv muaj peev xwm ua tau zoo hydrogen adsorption, tab sis kev nqus hydrogen ntau dhau yuav ua rau cov roj hydrogen tuaj yeem nkag mus rau hauv cov khoom, ua rau hydrogen embrittlement. Hydrogen embrittlement yuav ua rau kom brittleness ntawm titanium cov ntaub ntawv thiab txo lawv cov khoom siv kho tshuab.
Kev nyuaj siab corrosion crackingyog hais txog corrosion cracking phenomenon uas tshwm sim nyob rau hauv titanium cov ntaub ntawv nyob rau hauv qhov kev txiav txim ntawm sab nraud kev nyuaj siab. Thaum cov khoom siv titanium nyob hauv qhov nruab nrab corrosive thiab raug rau ib qho kev ntxhov siab, corrosion yuav nthuav dav raws li cov kev taw qhia ntawm kev ntxhov siab thiab tsim cov kab nrib pleb. Qhov no corrosion cracking hem lub zog thiab kev cia siab ntawm cov khoom titanium.
Cov ntaub ntawv tshwj xeeb corrosion ntawm titanium muaj xws li crevice corrosion, pitting corrosion, galvanic corrosion, weld cheeb tsam corrosion, hydrogen absorption thiab embrittlement, thiab kev nyuaj siab corrosion cracking. Nkag siab txog cov ntaub ntawv corrosion no yog qhov tseem ceeb heev los tiv thaiv corrosion ntawm titanium cov ntaub ntawv thiab txuas ntxiv lawv lub neej kev pab cuam. Hauv kev siv cov tswv yim, cov kev ntsuas sib xws, xws li cov txheej txheej saum npoo, cov txheej txheem vuam tsim nyog thiab kev siv cov tshuaj tiv thaiv corrosion, yuav tsum tau coj los txo lossis zam qhov tshwm sim ntawm cov ntaub ntawv corrosion los xyuas kom muaj kev nyab xeeb thiab txhim khu kev siv cov ntaub ntawv titanium.
Titanium yog cov hlau uas zoo heev corrosion kuj, feem ntau yog vim oxide zaj duab xis (titanium oxide) tsim rau ntawm nws nto. Cov oxide zaj duab xis no yog txheej ruaj khov thiab 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 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 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 ntom ntom ntom ntom ntom ntom oxide txheej uas tuaj yeem tiv thaiv titanium hlau los ntawm kev cuam tshuam nrog cov chaw sab nraud. Txawm li cas los xij, nyob rau hauv qee qhov xwm txheej, cov ntawv tshwj xeeb corrosion tseem tuaj yeem tshwm sim hauv titanium hlau, feem ntau suav nrog cov hauv qab no:
Fluoride corrosion:Titanium tej zaum yuav corrode nyob rau hauv lub xub ntiag ntawm fluoride, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas muaj siab fluoride ions thiab kub siab. Fluoride ions tuaj yeem rhuav tshem cov oxide zaj duab xis ntawm qhov chaw ntawm titanium, nthuav tawm cov titanium hlau rau corrosive media.
Ammonia Gas Corrosion:Titanium kuj tseem tuaj yeem corrode hauv ib puag ncig uas muaj ammonia lossis nitrogen. Ammonia thiab nitrogen tuaj yeem cuam tshuam nrog titanium hauv qee qhov xwm txheej thiab rhuav tshem cov yeeb yaj kiab oxide tiv thaiv ntawm nws qhov chaw.
Sulfide corrosion kuj:Hauv qee qhov chaw uas muaj sulfides, titanium hlau kuj tseem cuam tshuam los ntawm corrosion. Sulfide tuaj yeem rhuav tshem cov oxide zaj duab xis ntawm titanium nto, ua rau corrosion.
Chloride corrosion:Cov ntsiab lus siab ntawm chloride ions lossis chlorides kuj tseem tuaj yeem cuam tshuam rau titanium hlau. Hauv qee qhov chaw chloride corrosion, titanium yuav raug kev txom nyem los ntawm pitting corrosion los yog intergranular corrosion.
Txhawm rau tiv thaiv qhov tshwm sim ntawm cov ntawv tshwj xeeb corrosion, titanium feem ntau yog kho nrog kev kho tshwj xeeb thaum lub sijhawm tsim khoom, xws li xaiv cov alloys tsim nyog, txheej txheej lossis lwm yam kev tiv thaiv los txhim kho corrosion ntawm titanium hlau.
