Dab tsi yog corrosion tsis kam?

Corrosion tsis kam yog cov khoom siv muaj peev xwm tiv thaiv cov tshuaj tsis zoo los ntawm ib puag ncig kev tawm tsam, feem ntau oxidation. Cov cuab yeej no txiav txim siab tias cov hlau zoo li cas, thiab lwm yam ntaub ntawv tswj hwm lawv cov qauv kev ntseeg siab thaum raug rau cov pa dej, acids, ntsev, thiab lwm cov neeg sawv cev corrosive.

Nkag siab txog cov qauv ntawm kev txhim kho corrosion

Cov khoom siv tsis txaus siab los ntawm kev xeb ua raws li cov hauv paus ntsiab lus. Thaum cov hlau nto corrosive ntsiab, confochemical ntawm cov ntaub ntawv hauv tshuab hluav taws xob qhov twg oxidation tshwm sim ntawm qhov chaw anodic thiab txo tshwm sim ntawm cov chaw Cathodic. Cov khoom siv tiv thaiv nyob ntawm seb cov khoom siv chromium ua rau cov txheej txheem tiv thaiv oxide nrog rau cov xim txheej txheem, inhibitors, thiab kev tiv thaiv kev tiv thaiv kev tiv thaiv, thiab kev tiv thaiv kev tiv thaiv.

Qhov sib txawv ntawm corrosion tsis kam thiab corrosion tus nqi teeb meem tseem ceeb. Kev tawm tsam tiv thaiv kev tiv thaiv kev tiv thaiv, thaum tus nqi ntsuas ntsuas qhov tseeb demadation ceev. Cov ntaub ntawv nrog lub siab tiv taus qeeb lossis tiv thaiv kev pib ntawm cov tshuaj tiv thaiv corrosive, feem ntau ntsuas cov millimeters ib xyoos lossis mils nkag tob.

TSEEM CEEB TA QAB CE CL Corrosion Kuj

Passive zaj duab xis ua sawv cev thawj lub tshuab tiv thaiv hauv ntau qhov corrosion {{}}} tiv taus alloys. Stainless hlau, txhim kho cov roj chomium oxide tuab tuab uas tus kheej- heure kho thaum kos tau nyob rau hauv lub xub ntiag ntawm oxygen. Qhov txheej txheem passivation block cov oxidation los ntawm kev tiv thaiv oxygen los ntawm mus txog ntawm lub hauv paus hlau. Txheej txheej ruaj khov nyob ntawm chromium concentration- yam tsawg kawg 10.5% chromium cov ntsiab lus txhais tau tias stainless hlau.

Alinium thiab titanium ua haujlwm ua haujlwm zoo sib xws, paub nyias txhuas oxide thiab titanium dioxide txheej feem. Cov yeeb yaj kiab passive nthuav tawm cov yam ntxwv sib txawv: aluminium txheej ua haujlwm tshwj xeeb hauv cov chaw ua suab paj nruag zoo, thaum Titanium zaj duab xis tau ua rau muaj kev ua thiab kub. Qhov tsim ceev thiab ruaj khov ntawm cov txheej tiv thaiv no ncaj qha rau correlate nrog cov khoom siv thoob plaws corrosion distarance kev ua tau zoo.

Kev hloov kho cov kev hloov kho kom zoo dua los ntawm ntau txoj hauv kev. Molybdenum ntxiv txhim kho kev ua kom muaj kev ua kom zoo hauv cov chloride ib puag ncig. Nickel tau nce dav dav corrosion tsis kam thiab ruaj khov pab txhawb nqa cov qauv. Nitrogen ntxiv dag zog rau txheej passive thiab nce pittings. Qhov pitting tiv thaiv tus naj npawb (pren) mis {}}}}}}}}}}}}} (%}}

Hom Corrosion thiab Kuj Xav Tau

Kev sib xyaw corrosion

Qhov no feem ntau cov ntaub ntawv twv yuav tawm tsam tag nrho cov kab mob sib luag sib raug zoo. Atmospheric corrosion ntawm hlau ua piv txwv tsis zoo li qub, uas tag nrho cov theem maj mam hloov olide. Cov tswv yim ua kom pom tseeb rau ntawm kev tiv thaiv thaiv kev tiv thaiv los ntawm cov txheej txheem lossis xaiv cov ntaub ntawv nrog cov chaw pabcuam hauv cheeb tsam.

Zos cov ntaub ntawv corrosion

Pitting corrosion tsim cov qhov me me uas nkag mus tob rau hauv cov khoom, feem ntau muab zais hauv qab cov khoom lag luam corrosion. Stainless cov hlau hauv chloride nyob rau hauv chloride -} muaj cov chaw ib puag ncig muaj feem tshwj xeeb. Kev tiv thaiv yuav tsum muaj txiaj ntsig zoo thiab ceev faj cov khoom siv raws li tshuaj chloride thiab cov xwm txheej kub.

Corrosion corrosion loj hlob hauv cov chaw uas thaiv uas muaj cov neeg tsis muaj kev cuam tshuam rau kev siv tshuaj rau kev ua kom muaj kev ntxhov siab. Cov khoob nyob rau hauv gaskets, threaded sib txuas, thiab overlapping chaw tsim cov chaw muaj zog tsis muaj zog. Qhov tseem ceeb ua kom cov ntsuas kub tseem ceeb pab tiv thaiv kev tawm tsam kev tawm tsam, nrog kev ntaus nqi ntau dua uas qhia tau zoo ua tau zoo.

Intergrani Corrosion tawm tsam cov ciaj ciam, tshwj xeeb hauv cov cua sov tsis muaj zog nyob qhov twg chromium carboidation tsim chromium carromium {}} depleted aav. Tshuaj annaling cov kev kho cua sov thiab tsawg-} Cov qhab nia BACBON (316L, 304L) tiv thaiv qhov kev paub no.

Siab - kub corrosion

Nce siab kub nrawm nrawm ntau yam kev ua tsis ncaj. Cov neeg hloov cov neeg hloov tus lej ntawm cov neeg hloov pauv rau oxides ntawm cov nqi nce ntxiv nrog qhov kub thiab txias. Sulfididation tshwm sim nyob rau hauv sulphur -} muaj ib puag ncig ib puag ncig hauv petrochemical ua. Carburization nyob rau hauv high-} Cov pa roj carbon cov roj teeb tuaj yeem hloov kho cov hmoov rau hmoov los ntawm cov hlau av.

Kuj yuav tsum muaj qhov kub siab yuav tsum muaj cov alloys tshwj xeeb. Nickel -} Raws supallots tswj hwm kev tiv thaiv chromium oxide dos ntawm qhov kub tshaj 1000 degree. Hlau - Raws alloys nrog txhuas ntxiv ua cov txheej txheej sib txawv aluminium oxide txheej. Oxide Txheej Txheej Txheem dua thiab kev loj hlob tus nqi txiav txim siab ntev - lub sijhawm ua haujlwm.

Ntsuas thiab qim kom meej corrosion tsis kam

Electrochemical Testing txoj kev

Potentiodynamnamic Polarization Polarization Polarization Polarization Polarization Polarization Polarization Polarization Polarization Cov Lus Qhia Tshaj Tawm nrog rau Corrosion muaj peev xwm, corrosion tam sim no ceev, thiab pitting muaj peev xwm. Qhov sib txawv ntawm pitting thiab corrosion muaj peev xwm qhia tau cov npoo ntawm kev nyab xeeb tiv thaiv kev tawm tsam hauv zej zog. Cov teeb meem loj dua rau kev tiv thaiv zoo dua.

Electrochemical impedance spectroscopy (EIS) kev ntsuas tiv thaiv los ntawm kev thov AC phiajcals thoob plaws ntau zaus. Lub impedance modulus ntawm cov zaus tsawg zaus correlates nrog tag nrho corrosion tsis kam, sib txuas ua hauj lwm, thiab pore tsis kam. Qhov tseem ceeb saum toj no 10 ^ 9 ω ω-CAP ib feem ntau qhia txog kev tiv thaiv zoo heev rau cov tshuab sib txuas.

Kev ntsuam xyuas ib puag ncig ib puag ncig

Kev kuaj xyuas ntsev (ASTM B117) accelerates corrosion los ntawm kev ua atomized 5% sodium vloride tov. Thaum tsis muaj tus sawv cev txig ntawm tiag- ntiaj teb cov xwm txheej, qauv 240-teev lossis 1000 teev kev ua kom muaj txiaj ntsig cov khoom siv Advanced coast tuaj yeem nce substrate ua kom tsis kam 36-pob hauv ntsev tshuaj tsuag thiab 240-tais hauv kev ntsuam xyuas hauv kev ntsuas tau raws li EIS ntsuas.

Kev ntsuam xyuas cov kev xeem hauv ib puag ncig tshwj xeeb ib puag ncig muab cov ntaub ntawv cuam tshuam ncaj qha. Kuaj cov tsis suav nrog kev xav, kub, thiab lub sijhawm thiab sijhawm ntev yuav tsum phim cov kev pabcuam. Kev ntsuas dej hnyav thiab nkag siab tob calculation paib tiv thaiv cov nqi corrosion rau cov khoom sib piv.

Cov khoom siv xaiv rau corrosion tsis kam

Cov Hlau Stainless

Austenitic qib (304, 316, 316, 316, 316, 316, 316, 316, 31 3}} hom phiaj corrosion {}}} tiv taus cov ntawv thov. Cov ntsiab lus 316 tsev neeg Molybdenum muab cov pitting zoo tshaj plaws muab piv rau 304, ua rau nws nyiam rau cov tub rog thiab tshuaj lom neeg ua haujlwm. Tsawg {{9-} cov roj carbon l- qib pib tiv thaiv kom txhob muaj qhov rhiab thaum lub sijhawm vuam.

Ferritic stainless hlau (430, 444) muab cov corrosion tsis kam nrog tus nqi qis dua li txo cov qib. Lawv cov khoom sib nqus thiab kev tiv thaiv kom muaj kev ntxhov siab corrosion crushing cov ntawv thov. Txawm li cas los xij, lawv cov qauv siv tau tsawg thiab qis dua kev ua kom muaj kev txwv siv hauv kev thov cov qauv txheej txheem.

Nas {-} Cov qeb siab (17x} Kev kho cua sov kev laus nthuav dav muaj zog thaum ua kom muaj kev ua haujlwm zoo. Aerospace thiab cov ntawv kho mob kho mob ntau zaus qhia meej cov ntaub ntawv no.

Nickel - Raws li alloys

Nickel alloys Excel nyob rau hauv ib puag ncig corrosive uas tsis tshua muaj. Cov Qib Hastelloy tiv thaiv ob qho tib si oxidizing thiab txo cov kua qaub. Inconel alloys tswj lub zog thiab kev tawm tsam ntawm qhov kub txog rau 1100 degree. Cov ntaub ntawv uas kim tshaj plaws pov thawj lawv cov nqi hauv kev ua tshuaj, nuclear reactors, thiab aerospace inpuls system uas tsis muaj kev ua haujlwm loj heev.

Ntshiab Nickel muab kev tiv thaiv zoo hauv caustic alkalis thiab tsis {{} ecidizing acids. Kev sib cais nrog chromium, molybdenum, thiab tungsten txuas ntxiv lub peev xwm rau kev siv tshuaj ntau. Monel (Nickel - tooj liab alloy) ua tau zoo nyob hauv seasater thiab hydrofluoric acid txawm muaj cov chromium.

Txhuas Alloys

Aluminium lub ntuj oxide zaj duab xis muab xam cov pa corrosion tsis kam, tshwj xeeb yog siv tau rau hauv cov huab cua raug. Txawm li cas los xij, tooj {{-} muaj alloys zoo li 2024 aluminium ua pov thawj tsis zoo nyob rau hauv kev ua tsis zoo. These high-strength aerospace alloys require protective cladding-a pure aluminum or Al-Zn coating applied during manufacturing that acts as both a barrier and sacrificial layer.

Lub 5000 - series (txhuas {}}-magnesium-alloys sib npaug corrosion thiab zoo heev weldability. Tubrog nkoj thiab architectural ntau yam siv cov qib no. Anodizing ntxiv txhim kho kev tiv thaiv los ntawm kev tiv thaiv itificionly oxide txheej los ntawm nanometers rau micrometers.

Titanium thiab titanium alloys

Titanium cov ntaub ntawv ib qho tshwj xeeb ua tau zoo kawg nkaus zaj duab xis uas tiv thaiv kev tawm tsam hauv Chloride Dolutions, oxidizing cov kua qaub, thiab dej hiav txwv. Qhov no tsis kam ntawm cryogenic kub txog 300 degree. Thaum kim, Titanium lub zog {}} qhov hnyav ua rau nws ua kom muaj zog thiab kev phais mob ua haujlwm, thiab phais cov pa.

Kev sib cais nrog Alloy thiab Vanadium (Ti - 6 ntawm} 6v) nce lub zog. Beta-stabiliized alloys muaj kev txhim kho kom zoo dua. Qhov kev sib tw dag dag nyob rau hauv cov sintering tiav thaum chaw tsim khoom-seem porosity degrades ua rau ob lub zog thiab corrosion kev ua haujlwm.

Corrosion Kuj nyob rau hauv kev txhaj tshuaj hlau

Hlau txhaj MOLDING (MIM) ua rau complex {{0} geometry seem nrog cov khoom siv tau, yog corrosion tsis tau yuav tsum ua tib zoo saib xyuas. Sintering cov txheej txheem ua rau nyiam chromium evaporation los ntawm stainless hlau chaw, muaj peev xwm degrading lub passive txheej uas muab kev tiv thaiv.

Mim RaugUa Kev Saib Xyuas

Stainless hlau Matic feem ntau ua tiav 96 - 98% ntawm theoretical ceev. Cov Porosity tseem ua kom muaj saum npoo -} Coneled pores uas nthuav dav ntxiv rau thaj chaw ntxiv rau kev tawm tsam corrosive. Pitting Corrosioning Qhia Mim 316L tuaj yeem ua tau zoo dua rau cov khoom siv wrought yam tsis muaj cov post - ua. Nto roughness tseem cuam tshuam tus cwj pwm-polishing txo qis roughness thiab txhim kho los ntawm kev txo qis kev pib ua lag luam kev pib ua kom tsawg.

Phau Ntawv Xaiv Qhov Kev Xaiv Qhov Cuam Tshuam Kev Ua Yeeb Yam Zaum Kawg Corrosion. Cov pa roj carbon nyob ntawm phau ntawv Pyrolysis nce cov ntsiab lus pyrolysis nce carbon cov ntsiab lus, muaj peev xwm ua rau chromium carbide nag lossis daus thaum cua txias thaum txias. Qhov kev nkag siab no txo ​​corrosion tsis kam. Tsawg -}}}} Carbon binder tshuab thiab oxygen {{4 sintering atmospheres txo cov teebmeem no.

Cov txheej txheem txhim kho degrees

Tshaj tawm - sumining cov kho mob restore raposion tsis kam rau wrought - cov khoom siv. Kev siv tshuab hluav taws xob tshem tawm cov chromium- depleted saum npoo av thiab tsim ib qho du, passive nto. Cov tshuaj lom neeg ua haujlwm rau nitric acid los yog citric acid daws teeb meem muaj kev sib txuam passive cov yeeb yaj kiab. Cov txheej txheem no tuaj yeem tsim cov mim stainless hlau kev ua tiav kom phim lossis tshaj li cam khwb cia cam hauv kev xeem corrosion.

Daim ntawv thov txheej txheej muab kev tiv thaiv ntxiv. Lub cev vapor depitional (PVD) ntawm titanium nitride lossis chromium nitride tsim nyuaj, corrosion {1} {{{1} {awnt ntau qhov chaw ntawm cov khoom siv Mim cov hlau. Electroplating nrog nickel - phosphorus lossis chromium txhim kho rau kev ua kom zoo nkauj thiab ua haujlwm. Cov txheej txheej nplaum tau txais txiaj ntsig los ntawm Mim nyob ze- net}} duab muaj peev xwm, uas minimizes machining kev puas tsuaj rau cov chaw.

Cov Khoom Siv Xaiv rau Cov Ntawv Thov MIM

Mim 316L Dom Rominates Kev Kho Mob Cov Khoom Siv thiab Kev Ua Noj Ua Noj Khoom Noj Yuav Tsum Ua Noj Txiaj Yuav Tsum Ua Haujlwm Tshwj Xeeb. Nws cov qauv Austenic tsis kam lees pittings thiab tu tshuaj tu. Mim 17-4 phot muab lub zog siab dua nrog kev tiv thaiv kev cuam tshuam rau kev muaj khoom siv. Cov lus teb ua rau cov lus teb ua rau tawv tawv tseem zoo dua Sawstering's Thermal lub voj voog.

Titanium mim pab ua cov khoom siv ua kom zoo nkauj ntawm cov khoom siv hluav taws xob nrog cov txiaj ntsig zoo hauv lub cev ib puag ncig. Txawm li cas los xij, kev ua tiav qhov ceev tau ua pov thawj nyuaj - tsis tiav Sinceing nplooj uas tsis yooj yim ob lub zog thiab corrosion kev ua haujlwm. Muaj kev vam meej rau cov mim hmoov zoo, kev ua kom zoo txiav txim siab, thiab kub- Kev kho mob.

Economic Kev cuam tshuam thiab kev lag luam tseem ceeb

Corrosion imposes ua lub nra hnyav hluav taws xob kwv yees ntawm $ 2.5 trillion ib xyoos ib zaug {{1% sib npaug rau 3.4% ntawm lub ntiaj teb GDP. Daim duab no suav nrog cov nqi ncaj qha nrog kev kho vaj tse, hloov pauv Cov nqi tsis ncaj ntxiv lwm $ 552 billion txhua xyoo dhau los ntawm kev tsim khoom poob, qeeb, thiab kev cuam tshuam dhau los, thiab overhead cuam tshuam.

Cov txheeb xyuas tsis ntev los no qhia txog 15 {{- 33% ntawm cov siv siv txhua xyoo hloov corroded cov khoom, accounting rau 1.6-3.4% ntawm ntiaj teb b-₂ emissions. Raws li kev nyab xeeb-hom phiaj xwm, hloov corroded steel ib leeg tuaj yeem sawv cev rau cov 4.1-9.1 ntawm tag nrho cov European Union cov pab pawg European tam sim no. Qhov kev cuam tshuam ntawm no thiab ib puag ncig ib puag ncig ua rau corrosion tsis kam rau lub hauv paus kom ruaj khov.

Kev Tiv Thaiv Kev Lag Luam

Cov kev tshawb fawb pom tias kev siv cov kev coj ua kom zoo tshaj plaws yuav txo cov nqi thoob ntiaj teb los ntawm 155%, txuag $ 375-5 xyoos ib xyoos ib zaug. Kev siv tsheb kev lag luam tau zoo tshaj plaws: thaum xyoo 1927 thiab 1999, tswj hwm lub cev muaj zog, thiab cov kab noj hniav hauv av. Cov neeg siv cov kev pab cuam muaj xws li cov tsheb tswj cov qauv kev cai lij choj dhau li 10-15 xyoo ua cov huab cua nruj ua ntej.

Lub neej {{0-}} Kev Tshawb Fawb Tus Nqi Qhia tawm tias Corrosion {1} {>> ntau dua thawj tus nqi, feem ntau ua pov thawj ntau dua kev lag luam. Lub taub roj stainless siv tau nyiaj 40% ntau dua cov roj carbon stimpinates lub neej los ntawm 15 mus rau 40+}}}}}}}}}} Cov khoom lag luam tsis muaj kev paug. Tag nrho cov tswv cuab tus nqi favors stainless hlau los ntawm ntau cov npoo hauv cov tshuaj, khoom noj, thiab ntaub ntawv thov tshuaj.

Cov tswv yim tiv thaiv thiab thev naus laus zis

Cov Tshuab Txheej

Organic txheej txheem tsim kev ua kom muaj lub cev ntawm substrates thiab ib puag ncig ib puag ncig. Niaj hnub negoxy lub tshuab ua tiav 10 {- ntev nyob rau hauv marine atmospheres. Self - kho cov xim muaj zog uas muaj cov pwm uas puas, tso tawm cov neeg sawv cev kom huv, kom muab cov kab tawg. Tsis ntev los no nanocomposite qauv nrog polyaniline thiab zinc teb thiab zinc teb qhia tau tias 99.28% kev kho tus kheej zoo thiab txo cov nqi kho mob 450-quav.

Metallic txheej txheej muab cov kev txwv lossis kev tiv thaiv kev txi. Kub {- dip galvanizing siv cov txheej zinc zinc uas corrode preferently, tiv thaiv steel subtrates. Zinc Txheej Thickness ntawm 85 - 100 micrometers muab kev tiv thaiv 50-70 xyoo. Aluminium thiab zinc-txhuas txheej txheem muab kev ua haujlwm zoo dua hauv cov tub rog thiab cov cua.

Ceramic thiab ceraming txheej txheem tsim cov nyias nyias, txheej txheem nrog cov kub ua tau zoo. Anodizing Txhuas cov ntaub ntawv tswj tau cov txheej txheem txhuas oxide txheej 5 {{}}}} Micrometers tuab nrog cov xim xaiv thiab txhim kho hardness. Qhov chromate hloov dua siab tshiab, raug hloov tawm rau ib puag ncig cov laj thawj, tau hloov los ntawm kev hloov pauv Chromium thiab zirconium-raws li cov kev xaiv uas muaj kev ua tau zoo.

Cathodic Kev Tiv Thaiv

Kev ua kom zoo nkauj tam sim no siv cov DC voltage sab nraud kom ua rau cov kev tiv thaiv kev tiv thaiv Cathodic hauv cov tshuab hluav taws xob hauv tshuab hluav taws xob. Pipelines, kev tso tsheb hlau luam, thiab cov qauv ua tub rog siv cov ntsuas hluav taws xob txhawb nqa cov tshuaj tua hluav taws. Cov qauv tsim kom tsim nyog tuaj yeem txo qis cov tub kab xeb rau cov neeg tsis saib xyuas, txuas ntxiv lub neej muaj sia ntawm kev tiv thaiv sib luag.

Kev muab cov txheej txheem fij tseg anode txuas cov magnesium, txhuas, lossis zinc anodes uas corrode nyiam. Cov "Passive" yuav tsum tsis muaj lub zog sab nraud thiab suged cov kav dej faus thiab tso dej sov, thiab nkoj hulls. Anode Kev Siv Feem Pua Txiav Txim Siab Hloov Sij Hawm, Feem Ntau 5-15 xyoo nyob ntawm qhov kev thov tam sim no thiab anode loj.

Corrosion Inhibitors

Tshuaj lom neeg Inhibitors txo tus nqi corrosion los ntawm adsorbing ntawm cov hlau chaw thiab hloov cov tshuaj tiv thaiv hlau. Anodic inhibitors denpress oxidation tshua tab sis txaus ntshai pitting yog nyob rau hauv {{1} dosed. Cathodic Inhibitors qeeb txo cov kev cuam tshuam nrog cov kev pheej hmoo qis. Ua yeeb yaj kiab Inhibitors tsim Hydrophobic kev cav cuam tshuam tshwj xeeb hauv cov roj thiab roj ntau lawm cov tshuab.

Green Inhibitors muab tau los ntawm cov nroj tsuag rho tawm muab cov kev xaiv ua phooj ywg zoo ib puag ncig mus tsoos chromates thiab cov hlau hnyav. Tebchaw muab rho tawm los ntawm Nees, Cassia, thiab pomegranate qhia txog 85-95% kev txhawb nqa hauv acid pickling thiab cov ntawv thov txias. Cov lus qhia ntau molecular dynamics Simulations Extract xaiv thiab kev ua kom zoo rau cov tshuaj uas tshwj xeeb thiab ib puag ncig.

Cov ntaub ntawv siab heev thiab cov lus qhia yav tom ntej

Graphene -} Txhim Kho Txheej Txheem

Graphene oxide ntxiv rau cov txheej txheem polymer tsim cov kev txwv tsis zoo rau cov pa thiab dej diffusion. Txawm 0.5 {{{4 4}}}}}}}}}}}}} feem pua ​​hnyav feem pua ​​kev thauj khoom txhim kho corrosion tiv thaiv cov kev ntsuas ntawm 2-3 xaj ntawm qhov ntau. Lub qauv ob-seem tau muab txoj kev tsim txom tsis muaj kev sib txawv uas ua rau qeeb qeeb. Kev lag luam xa tawm cov nqi ua kom nrawm dua li cov nqi tsim khoom poob qis.

Ai - driven corrosion tswj

Tshuab Kawm Txheej Txheem Txheej Txheem Eis Spectra, Txheej Thickness Ntsuas, Thiab Ib Cheeb Tsam Cov Ntaub Ntawv los twv Coating Thiab Cov Kev Pab Cuam Tshis. Kev txij nkawm txij nkawm cov sijhawm ua raws kev soj ntsuam zoo tshaj plaws thiab tiv thaiv kev poob nthav. Lub txheej soj ntsuam kev soj ntsuam, muaj nuj nqis ntawm $ 25.8 billion hauv 2024, nce ntxiv i {}} ntawm cov tshuab tsav tu.

High -} Entropy alloys

Cov zaws -}}}}}}}}}}}}}} ecots pom kev tshwj xeeb corrosion. Cocrfeni thiab Alcocrfeni Compositions daim ntawv qhia txog cov yeeb yaj kiab uas muaj cov kua qaub nyob rau hauv cov acids uas pom alloys tsis ua. Lawv txoj kev ua kom tiav cov tshuaj lom thiab sluggish diffusion kinetics borgpress incompital kev pib. Kev tshawb fawb tsom rau kev siv tau ntau yam rau cov chaw tshwj xeeb thaum tswj cov khoom siv neeg kho tshuab.

Cov Lus Nquag Nug

Dab tsi xwm txheej feem ntau cuam tshuam cov khoom siv cov khoom lag luam tsis kam?

Tshuaj lom neeg muaj pes tsawg leeg, tshwj xeeb chromium, molybdenum, thiab npib tsib xee cov ntsiab lus nyob rau hauv alloys, txiav txim siab passive zaj duab xis ruaj khov thiab tiv taus mus rau hauv zos nres. Qhov chaw ib puag ncig suav nrog rau chloride concentration, pH, ntsuas kub, thiab oxygen muaj kev cuam tshuam rau xeb loj. Cov mob deg teeb meem tseem ceeb {{du, oxide- free surfaces passibate ntau dua yooj yim dua li ntxhib cov chaw.

Yuav ua li cas koj txhim kho corrosion tsis kam ntawm cov qauv uas twb muaj lawm?

Cov ntawv thov txheej txheej muab cov kev daws teeb meem. Kev npaj cov khoom sib txawv los ntawm kev sib cav sib ceg tshem tawm cov corrosion uas twb muaj lawm thiab tsim cov txiaj ntsig zoo rau txheej nplaum. Cathodic tiv thaiv cov kev teeb tsa tiv thaiv kev tua lossis submerged qauv yam tsis muaj kev nkag mus saum toj. Tshuaj Tu thiab passivation redore passive cov yeeb yaj kiab ntawm stainless hlau tom qab kev ua paug tom qab kev ua paug lossis vuam.

Vim li cas thiaj tsis muaj hlau hlau tsis muaj qee zaum corrode?

Feem ntau cov hlwv hniav corrosion feem ntau tshwm sim los ntawm cov tshuaj pleev qhov ua tau zoo tshaj qhov chaw ib puag ncig, lossis cov paug tsis txaus ntseeg rau cov neeg ua haujlwm uas passive. Qhov tsis zoo los ntawm cov vuam hlau tsis raug cai tsim chromium - decleted grainaries tsis muaj kev tawm tsam. Cremices thiab cov nyiaj tso nyiaj tau tsim cov kev ua kom muaj kev chim siab tsis sib haum xeeb uas rhuav tshem cov yeeb yaj kiab passive. Cov kev xaiv qib sib txuam rau qhov chaw tshwj xeeb tiv thaiv feem ntau stainless hlau tsis tau.

Ntev npaum li cas yog kev tiv thaiv kev tiv thaiv ntev npaum li cas?

Kev tiv thaiv kev sib txawv ntawm cov qauv thiab ib puag ncig. Qhov zoo organic txheej muab 10-25 xyoo hauv kev nthuav dav huab cua, 5-10 xyoo hauv kev xav. Galvanized tsho tshaj tshaj 50-70 xyoo nyob rau hauv cov huab cua huab cua, 20-30 xyoos hauv chaw marine. Cathodic kev tiv thaiv cov tshuab ua haujlwm tas mus li ntawm kev tu xyuas kom zoo thiab anode hloov. Kev xam cov khoom tsis kam ua rau kav cov txheej txheem txheej txheem thaum tsim nyog xaiv rau ib puag ncig.