Nrog rau txoj kev loj hlob sai ntawm kev lag luam kev lag luam, qhov chaw dej hiav txwv loj thiab kev nplua nuj nyob hauv hiav txwv tau pib nkag mus rau tib neeg lub zeem muag. Dej hiav txwv yog lub tsev muaj khoom muaj nqis loj heev, nplua nuj nyob rau hauv cov khoom siv roj ntsha, cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob dej hiav txwv. Kev txhim kho thiab kev siv cov khoom siv hauv hiav txwv yog qhov sib cais los ntawm kev tshawb fawb thiab kev tsim cov khoom siv tshwj xeeb hauv hiav txwv, thiab kev sib txhuam thiab hnav hauv ib puag ncig marine hnyav yog cov teeb meem tseem ceeb uas txwv tsis pub siv cov khoom siv marine thiab kev tsim cov khoom siv marine. Kawm txog kev txhim kho corrosion thiab coj tus cwj pwm ntawm 316L thiab 2205 stainless hlau nyob rau hauv ob qho kev siv dej hiav txwv: seawater corrosion hnav thiab cathodic tiv thaiv, thiab siv ntau yam kev sim xws li XRD, metallography, electrochemical kuaj thiab corrosion thiab hnav synergy los soj ntsuam cov microstructure. theem hloov Los ntawm lub kaum sab xis, cov nyhuv ntawm seawater zawv zawg hnav ntawm corrosion thiab hnav cov khoom ntawm stainless hlau yog analyzed.Cov kev tshawb fawb tau raws li nram no:
(1) Kev hnav tus nqi ntawm 316L nyob rau hauv siab load yog me dua tus nqi coj nyob rau hauv qis load. XRD thiab metallographic tsom xam qhia tau hais tias 316L undergoes martensitic transformation thaum seawater zawv zawg hnav, thiab nws transformation efficiency yog hais txog 60% los yog ntau tshaj; Muab piv cov martensite transformation tus nqi nyob rau hauv ob seawater tej yam kev mob, nws tau pom tias seawater corrosion hinders lub martensite transformation.
(2) Potentiodynamic polarization scanning thiab electrochemical impedance txoj kev tau siv los kawm txog kev cuam tshuam ntawm 316L microstructural hloov ntawm tus cwj pwm corrosion. Cov txiaj ntsig tau pom tias qhov hloov pauv martensitic cuam tshuam rau cov yam ntxwv thiab kev ruaj ntseg ntawm cov yeeb yaj kiab passive ntawm cov hlau tsis huv, ua rau corrosion ntawm stainless hlau. Kev tiv thaiv corrosion tsis muaj zog; electrochemical impedance (EIS) tsom xam kuj tau mus txog qhov zoo sib xws, thiab cov generated martensite thiab untransformed austenite daim ntawv microscopic hluav taws xob coupling, uas nyob rau hauv lem hloov cov electrochemical cwj pwm ntawm stainless hlau.
(3) Cov khoom poob ntawm316L stainless hlauNyob rau hauv dej hiav txwv muaj xws li ntshiab kev sib txhuam thiab hnav cov ntaub ntawv poob (W0), cov synergistic nyhuv ntawm corrosion ntawm hnav (S') thiab synergistic nyhuv ntawm hnav ntawm corrosion (S'), thaum lub martensitic theem transformation cuam tshuam rau kev sib raug zoo ntawm cov ntaub ntawv poob. txhua ntu tau piav qhia.
(4) Lub corrosion thiab hnav tus cwj pwm ntawm2205dual-theem steel nyob rau hauv ob seawater tej yam kev mob tau kawm. Cov txiaj ntsig tau pom tias: kev hnav tus nqi ntawm 2205 dual-theem steel nyob rau hauv siab load yog me dua, thiab seawater zawv zawg coj ua rau lub σ theem tshwm sim nyob rau saum npoo ntawm dual-theem steel. Cov kev hloov ntawm microstructural xws li deformations, dislocations thiab lattice hloov kho kom hnav tsis kam ntawm dual-theem steel; piv nrog 316L, 2205 dual-theem steel muaj qhov hnav me me thiab hnav zoo dua.
(5) Lub chaw ua haujlwm electrochemical tau siv los ntsuas cov khoom siv hluav taws xob ntawm cov khoom siv ntawm ob theem hlau. Tom qab zawv zawg hnav hauv seawater, tus kheej-corrosion peev xwm ntawm cov2205dual-theem steel txo thiab qhov ceev tam sim no nce; los ntawm txoj kev ntsuas electrochemical impedance (EIS) kuj tau xaus lus tias qhov kev tiv thaiv tus nqi ntawm cov hlau duplex txo qis thiab cov seawater corrosion kuj tsis muaj zog; σ theem ua los ntawm zawv zawg hnav ntawm duplex steel los ntawm seawater txo cov Cr thiab Mo cov ntsiab lus nyob ib ncig ntawm ferrite thiab austenite, ua duplex steel ntau cuam tshuam rau seawater corrosion, thiab pitting pits kuj nquag tsim nyob rau hauv cov chaw puas.
(6) Cov khoom poob ntawm2205 duplex hlauFeem ntau yog los ntawm kev sib txhuam dawb huv thiab hnav cov khoom poob, suav txog li 80% txog 90% ntawm tag nrho cov poob. Piv nrog 316L stainless hlau, cov khoom poob ntawm txhua feem ntawm duplex hlau yog ntau dua li ntawm 316L. Me me.
Hauv cov ntsiab lus, nws tuaj yeem txiav txim siab tias 2205 dual-theem steel muaj qhov zoo dua corrosion nyob rau hauv dej hiav txwv ib puag ncig thiab tsim nyog rau daim ntawv thov hauv seawater corrosion thiab hnav ib puag ncig.
Post lub sij hawm: Dec-04-2023