Dab tsi yog cov ntsiab cai ntawm kev xaiv cov khoom siv titanium?
qhia
Vim tias titanium (titanium thiab titanium alloys) muaj cov khoom siv zoo thiab lub cev, nws muaj qhov ntom ntom thiab muaj zog tsawg. Qhov piv ntawm tensile lub zog σb rau qhov ceev ρ σb / p =200 yog yuav luag siab tshaj ntawm tag nrho cov ntaub ntawv hlau. .
Nyob rau tib lub sij hawm, nws muaj zoo heev corrosion kuj. Titanium cov tshuaj lom neeg ruaj khov zoo heev nyob rau hauv ib puag ncig corrosive thiab nws muaj peev xwm ua rau nws tus kheej muaj zog hauv electrolytes (muaj dej) tau ua rau daim ntawv thov thiab kev txhawb nqa ntawm titanium cov ntaub ntawv sai dua li ntau lwm yam hlau.
Feem ntau hais lus, kev lag luam ntshiab titanium muaj kev tiv thaiv zoo dua li -phase titanium alloys thiab -phase lossis + -theem titanium alloys, thiab muaj ntau yam kev siv. Txawm hais tias nws lub zog tsis siab npaum li -phase titanium alloys lossis + -theem titanium alloys, tab sis muaj cov yas zoo thiab yooj yim rau kev ua thiab tsim. Yog li ntawd, kev lag luam ntshiab titanium yog cov khoom siv feem ntau hauv cov thawv titanium.
Cov ntsiab cai xaiv
1) Deformed titanium cov ntaub ntawv yuav tsum tau muab rau hauv lub xeev annealed (M), thiab titanium castings yuav tsum tau muab nkag rau hauv lub xeev cam khwb cia.
2) TA3 ntawm cov deformed muaj ntshiab titanium TAO, TA1, TA2, thiab TA3, vim nws tsis txias deformation muaj peev xwm, feem ntau tsis haum rau siv nyob rau hauv cov khoom xws li lub tog raj kheej, taub hau, thiab npuas hau, thiab tsuas yog siv tau yam tsis muaj txias deformation los yog txias deformation. Qhov me me.
3) TA9 titanium-palladium alloy (Ti -0. 2Pa) thiab TA10 titanium-nickel-molybdenum alloy (Ti -0.8Ni -0.3Mo) yog siv nyob rau hauv high-temperature, Cov tshuaj chlorine uas muaj cov xov xwm thiab muaj peev xwm crevice corrosion (tshwj xeeb tshaj yog TA9 yog ntau resistant rau crevice corrosion) Nws yog tshwj xeeb tshaj yog haum rau siv raws li cov ntawv raj, flanges thiab lwm yam khoom.
4) Yog tias muaj ob peb galvanic, cov kev ntsuas hauv qab no feem ntau tuaj yeem ua:
① Sib txuas cov hlau (feem ntau yog cov hlau raug rau galvanic corrosion) nrog cov khoom siv insulating;
② Ntxiv cov khoom siv hluav taws xob sib cais ntawm ob lub hlau kom tsis txhob muaj cov roj teeb corrosive;
③ Ua kom qhov kev ncua deb ntawm cov hlau sib txawv, lossis hloov txoj haujlwm ntawm lawv kom tsis txhob muaj cov kab mob cathode;
④ Tsis txhob tsim cov cathode loj thiab me me anode ntawm ob lub hlau hauv lub roj teeb;
⑤ Siv kev tiv thaiv cathodic.
5) Yog tias muaj crevice corrosion, cov kev ntsuas hauv qab no feem ntau tuaj yeem ua:
① Txais kev tsim qauv tsim nyog, sim zam lossis tshem tawm qhov sib txawv stagnation thaj chaw thiab fouling phenomena, txhim kho cov dej hauv lub xeev ntawm cov khoom siv, thiab zam kev tsim ntawm qhov chaw tuag. Thaum muaj kev sib txuas hauv bolt, kev sib txuas vuam yuav tsum tau siv ntau li ntau tau, thiab qhov chaw vuam sib tshooj yuav tsum txuas ntxiv kom ntau li ntau tau. Lap welding los yog pob tw welding.
② Siv palladium txheej, oxidation los yog anodizing ntawm qhov chaw uas crevice corrosion yuav tshwm sim.
③ Sau cov qhov khoob nrog putty tov nrog NiO lossis npib tsib xee hmoov lossis MoO3 hmoov tuaj yeem ua rau qee zaum zam kev xeb.
④ Xaiv cov ntaub ntawv titanium uas tiv taus ntau dua rau kev xeb, xws li titanium-palladium alloy (TA9) lossis titanium-nickel-molybdenum alloy (TA10). Cov ntaub ntawv titanium no tshwj xeeb tshaj yog haum rau flanges nrog crevice corrosion ntawm flange sealing nto.
6) Yog tias hydrogen embrittlement tshwm sim, cov kev ntsuas hauv qab no feem ntau tuaj yeem ua:
① Xaiv cov khoom siv titanium nrog cov ntsiab lus hydrogen tsawg.
② Tiv thaiv kom tsis txhob muaj hydrogen nqus thaum lub sij hawm tsim khoom, uas yog, tsis txhob embedding hlau hais nyob rau hauv titanium nto thaum txiav, stamping, coiling, vuam thiab lwm yam kev tsim khoom; Kev ua cua sov thiab kev kho cua sov cua sov yuav tsum tau nqa tawm nyob rau hauv lub qhov cub cua sov nrog ib tug micro-oxidizing cua; Rau qee cov khoom siv titanium nrog cov qauv nyuaj, nws yog ib qho nyuaj rau kev ua kom tsis muaj roj-tiv thaiv vuam cov pob qij txha nyob rau sab nraub qaum kom tsis txhob muaj kev sib kis thiab kev nqus hydrogen thaum vuam.
③Xaiv ib puag ncig tsim nyog: Thaum siv cov hydrogen qhuav thiab ntub dej hydrogen ib puag ncig nrog qhov kub ntawm 71 ~ 316 degree, hydrogen nqus tuaj yeem tiv thaiv yog tias nws muaj qee qhov oxygen thiab noo noo. Thaum titanium nyob hauv qhov nruab nrab oxidizing, qhov nruab nrab nruab nrab, qhov nruab nrab tsis muaj zog los yog txo cov kua qaub uas muaj cov oxidizing tus neeg sawv cev, titanium feem ntau tsis nqus hydrogen, lossis absorbs hydrogen qeeb heev; Tab sis thaum lub titanium nto yog kab mob los ntawm hlau, muaj defects nto, Thaum lub zos corrosion tshwm sim los yog txawv txav tej yam kev mob tshwm sim, hydrogen absorption embrittlement ntawm titanium yuav tshwm sim. Titanium yog nquag rau hydrogen embrittlement nyob rau hauv ib puag ncig uas muaj corrosion los yog hauv zos corrosion tshwm sim.
④ Lub hydrogen absorption kuj tuaj yeem txhim kho los ntawm kev kho saum npoo, xws li kub-kub oxidation, anodization, thiab lwm yam.
⑤ Siv corrosion-resistant alloy los txhim kho corrosion kuj ntawm titanium thiab tiv thaiv titanium los ntawm absorbing hydrogen thiab embrittlement.
7) Cov ntaub ntawv titanium raug txwv nruj kom siv rau hauv cov kua chlorine thiab cov roj chlorine qhuav.
8) Cov ntaub ntawv titanium raug txwv tsis pub siv rau hauv fuming nitric acid nrog cov dej noo tsawg dua 2% lossis pub dawb nitrogen dioxide ntau dua 6%.
9) titanium cov ntaub ntawv yuav tsum tau zam los ntawm kev siv nyob rau hauv kev nyuaj siab corrosion ib puag ncig. Txhua qhov nruab nrab uas muaj kev ntxhov siab corrosion tsis tuaj yeem siv, txawm tias nws yog me ntsis corrosive rau titanium, tab sis tseem muaj kev pheej hmoo ntawm kev ntxhov siab corrosion tawg. Rov qab mus rau Sohu kom pom ntau ntxiv
