Nrog rau kev loj hlob sai ntawm kev lag luam hauv zej zog, qhov chaw dej hiav txwv loj heev thiab cov khoom siv hauv dej hiav txwv nplua nuj tau pib nkag mus rau hauv tib neeg lub zeem muag. Dej hiav txwv yog lub tsev khaws khoom muaj nqis loj heev, nplua nuj nyob rau hauv cov khoom siv biological, cov khoom siv zog thiab cov khoom siv zog hauv dej hiav txwv. Kev tsim kho thiab kev siv cov khoom siv hauv dej hiav txwv tsis tuaj yeem sib cais los ntawm kev tshawb fawb thiab kev txhim kho cov ntaub ntawv tshwj xeeb hauv dej hiav txwv, thiab kev sib txhuam thiab kev hnav hauv cov chaw ib puag ncig hauv dej hiav txwv hnyav yog cov teeb meem tseem ceeb uas txwv tsis pub siv cov ntaub ntawv hauv dej hiav txwv thiab kev txhim kho cov khoom siv hauv dej hiav txwv. Kawm txog kev xeb thiab kev hnav ntawm 316L thiab 2205 stainless hlau nyob rau hauv ob qho xwm txheej dej hiav txwv uas siv ntau: kev hnav khaub ncaws corrosion hauv dej hiav txwv thiab kev tiv thaiv cathodic, thiab siv ntau txoj kev sim xws li XRD, metallography, electrochemical testing thiab corrosion thiab hnav synergy los tshuaj xyuas cov kev hloov pauv theem microstructure Los ntawm lub kaum sab xis, cov nyhuv ntawm kev hnav khaub ncaws hauv dej hiav txwv rau kev xeb thiab hnav cov khoom ntawm stainless hlau raug tshuaj xyuas. Cov txiaj ntsig tshawb fawb yog raws li nram no:
(1) Tus nqi hnav ntawm 316L nyob rau hauv lub nra hnyav siab dua li tus nqi hnav nyob rau hauv lub nra hnyav qis. XRD thiab metallographic tsom xam qhia tau hais tias 316L dhau los ntawm kev hloov pauv martensitic thaum lub sijhawm hnav dej hiav txwv, thiab nws cov kev hloov pauv zoo yog li 60% lossis ntau dua; Piv rau cov nqi hloov pauv martensite nyob rau hauv ob qho xwm txheej dej hiav txwv, nws tau pom tias kev xeb dej hiav txwv cuam tshuam kev hloov pauv martensite.
(2) Kev ntsuas polarization potentiodynamic thiab electrochemical impedance txoj kev tau siv los kawm txog kev cuam tshuam ntawm 316L microstructural hloov pauv ntawm tus cwj pwm corrosion. Cov txiaj ntsig tau qhia tias qhov kev hloov pauv theem martensitic cuam tshuam rau cov yam ntxwv thiab kev ruaj khov ntawm cov zaj duab xis passive ntawm qhov chaw ntawm stainless hlau, ua rau corrosion ntawm stainless hlau. Qhov kev tiv thaiv corrosion tsis muaj zog; electrochemical impedance (EIS) kev tshuaj xyuas kuj tau mus txog qhov xaus zoo sib xws, thiab cov martensite tsim thiab untransformed austenite tsim microscopic hluav taws xob coupling, uas ua rau hloov pauv tus cwj pwm electrochemical ntawm stainless hlau.
(3) Kev poob ntawm cov khoom siv316L stainless hlaunyob rau hauv dej hiav txwv suav nrog kev sib txhuam ntshiab thiab hnav cov khoom poob (W0), qhov cuam tshuam synergistic ntawm corrosion ntawm hnav (S') thiab synergistic nyhuv ntawm hnav ntawm corrosion (S'), thaum lub sijhawm martensitic theem hloov pauv cuam tshuam rau Kev sib raug zoo ntawm cov khoom poob ntawm txhua qhov tau piav qhia.
(4) Kev xeb thiab kev coj ua ntawm cov khoom siv2205Cov hlau ob theem nyob rau hauv ob qho dej hiav txwv tau kawm. Cov txiaj ntsig tau qhia tias: tus nqi hnav ntawm 2205 hlau ob theem nyob rau hauv lub nra hnyav siab me dua, thiab kev hnav ntawm dej hiav txwv ua rau theem σ tshwm sim ntawm qhov chaw ntawm cov hlau ob theem. Kev hloov pauv me me xws li kev hloov pauv, kev tawg thiab kev hloov pauv ntawm cov ntxaij vab tshaus txhim kho qhov kev hnav tsis kam ntawm cov hlau ob theem; piv nrog 316L, 2205 hlau ob theem muaj tus nqi hnav me dua thiab kev hnav tsis kam zoo dua.
(5) Ib qho chaw ua haujlwm electrochemical tau siv los sim cov khoom electrochemical ntawm qhov hnav ntawm cov hlau dual-phase. Tom qab swb hnav hauv dej hiav txwv, qhov muaj peev xwm tiv thaiv tus kheej ntawm2205Cov hlau ob theem txo qis thiab qhov ceev tam sim no nce ntxiv; los ntawm txoj kev sim electrochemical impedance (EIS) kuj xaus lus tias tus nqi tsis kam ntawm qhov hnav ntawm duplex hlau txo qis thiab qhov tsis kam ntawm dej hiav txwv corrosion tsis muaj zog; theem σ tsim los ntawm kev swb hnav ntawm duplex hlau los ntawm dej hiav txwv txo cov ntsiab lus Cr thiab Mo nyob ib puag ncig ferrite thiab austenite, ua rau duplex hlau yooj yim rau kev xeb dej hiav txwv, thiab cov qhov dej pitting kuj yooj yim tsim nyob rau hauv cov chaw tsis zoo no.
(6) Kev poob ntawm cov khoom siv2205 ob lub hlaufeem ntau yog los ntawm kev sib txhuam thiab kev poob ntawm cov khoom siv hnav, suav txog li 80% txog 90% ntawm tag nrho cov kev poob. Piv nrog 316L stainless hlau, cov khoom siv poob ntawm txhua qhov ntawm duplex steel ntau dua li 316L. Me.
Hauv kev xaus lus, nws tuaj yeem xaus lus tias 2205 dual-phase steel muaj kev tiv thaiv corrosion zoo dua hauv dej hiav txwv ib puag ncig thiab nws tsim nyog dua rau kev siv hauv dej hiav txwv corrosion thiab hnav ib puag ncig.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-04-2023