Taw qhia rau cov tshuaj muaj pes tsawg leeg thiab kev ua haujlwm tsis zoo ntawm nickel-based alloy (incoloy825 / NO8825)
Incoloy 825 Taw qhia:
Cov ntsiab lus siab nickel muab cov alloy zoo tiv thaiv kev ntxhov siab corrosion cracking. Nws muaj kev tiv thaiv corrosion zoo hauv ntau yam xov xwm, xws li sulfuric acid, phosphoric acid, nitric acid thiab organic acids, alkali hlau xws li sodium hydroxide, potassium hydroxide thiab hydrochloric acid tov. Qhov kev ua tau zoo dua ntawm Incoloy 825 yog pom nyob rau hauv nuclear combustion dissolvers nrog ntau yam corrosive xov xwm, xws li sulfuric acid, nitric acid thiab sodium hydroxide, tag nrho cov txheej txheem nyob rau hauv tib yam khoom.
Incoloy825 alloy yog ib qho kev daws teeb meem ntxiv dag zog rau Fe-Ni-Cr-raws li corrosion-resistant alloy thiab tuaj yeem siv dav hauv roj av, tshuaj lom neeg kev lag luam, nuclear zog, aerospace thiab lwm yam kev lag luam. G. Roventil li al.'s research results on the corrosion properties of Incoloy825, Incoloy800, and Sanicro283 nickel-based alloys in kais dej uas muaj qhov sib txawv ntawm CI qhia tias: Incoloy825 alloy tuaj yeem ncav cuag lub xeev passivation tshiab tom qab nucleation ntawm pitting corrosion. . Piv nrog rau lwm yam ob alloys, nws muaj corrosion kuj zoo dua nyob rau hauv corrosive ib puag ncig. Kev tshawb fawb ntawm intergranular corrosion ntawm Incoloy825 alloy qhia tau hais tias nyob rau hauv ib qho acidic corrosive ib puag ncig uas muaj chloride, rhiab heev kev kho mob ua rau lub cim ntawm Cr-poor aav ntawm lub alloy grain ciam teb, yog li txhawb intergranular corrosion ntawm cov hlau. Nyob rau hauv qhov kub-kub thiab high-pressure H₂S / CO₂ ib puag ncig, corrosion ntawm Incoloy825 alloy yog me ntsis. Tsis muaj cov kab nrib pleb tshwm nyob rau saum npoo ntawm cov qauv kev ntxhov siab, tab sis pitting corrosion nucleates ntawm cov ciam teb, qhia tias cov qoob loo ntawm Incoloy825 alloy yog qhov tsis muaj zog thiab puas yooj yim. Cov txheej txheem corrosion hauv zos ntawm cov zaj duab xis passivation ntawm Incoloy825 alloy hauv cov tshuaj NaCl nrog tus nqi pH ntawm 5 tuaj yeem muab faib ua peb theem, xws li passivation, metastable xeev thiab hauv zos corrosion. Ua ntej lub zos corrosion tshwm sim, lub xeev passivation thiab lub xeev metastable yuav tshwm sim. Qhov siab dua qhov zaus ntawm lub xeev metastable, qhov kev ruaj ntseg ntawm cov zaj duab xis passivation tsis zoo, thiab yog li ntawd qhov qis dua ntawm cov hlau tsis kam rau hauv zos corrosion.
Al thiab titanium yog indispensable alloy ntsiab nyob rau hauv nickel-raws li corrosion-resistant alloys, uas ncaj qha cuam tshuam rau cov qauv, txhua yam khoom thiab corrosion kuj ntawm cov alloy. Thaum cov ntsiab lus Al + Ti yog tsawg li 0.5% (feem feem ntau), nws yog txaus los ua rau cov Incoloy800 alloy rau precipitate y theem thaum lub sij hawm kev laus, yog li txhim kho cov creep zog ntawm lub alloy; Ti qhov kev pab cuam rau creep lub zog tsis yog tsuas yog ntau dua li ntawm Al, tab sis kuj rau creep plasticity Qhov kev puas tsuaj tsawg dua li ntawm Al. Kev tshawb fawb ntawm TiN nyob rau hauv electroslag remelted Incoloy800 thiab Incoloy825 alloys qhia tau hais tias vim Incoloy800 thiab Incoloy825 alloys muaj ntau Ti ntsiab, TiN hais tau yooj yim tsim nyob rau hauv cov alloys thaum lub sij hawm smelting txheej txheem thiab ua ib qho chaw ntawm tawg pib.
Kev tshawb fawb txog nickel-based alloys feem ntau siv cov thermodynamic simulations. Raws li kev simulation thermodynamic, txoj kev tshawb fawb no tau kawm txog qhov sib txawv ntawm Al thiab Ti cov ntsiab lus ntawm cov qauv nag lossis daus ntawm cov hlau nplaum hauv qhov muaj pes tsawg leeg ntawm Incoloy825 alloy, thiab tshawb xyuas qhov cuam tshuam ntawm cov yam ntxwv ntawm cov qauv ntawm forged Incoloy825 alloy thiab corrosion kuj. nyob rau hauv txawv HC1 concentration ib puag ncig. kev sib deev cawv.
