Uniform corrosion hais txog cov khoom sib xws thiab cov khoom sib xws nyias nyias thoob plaws sab hauv thiab sab nrauv ntawm titanium cua sov raj thaum raug rau cov xov xwm muaj zog corrosive rau lub sijhawm ntev. The dense titanium dioxide passive film on the material surface is continuously dissolved and cannot regenerate steadily. Cov yeeb nkab phab ntsa thickness txo qis tusyees raws li kev xeb, lub siab - cov kabmob muaj peev xwm poob qis, thiab dhau los ntawm - phab ntsa ntub dej yuav tshwm sim thaum phab ntsa thickness poob tshaj qhov tsim kev ruaj ntseg tso cai. Tsis zoo li lub zos pitting los yog tawg puas tsuaj, qhov corrosion kis tusyees nyob rau hauv tag nrho cov nruab nrab kev sib cuag cheeb tsam, thiab lub deterioration℃yuav tau taug qab los ntawm tsis tu ncua ultrasonic thickness nrhiav kom tau.
1. Electrochemical Corrosion Mechanism
Titanium tso siab rau lub compact TiO₂ oxide zaj duab xis los cais cov substrate los ntawm corrosive ib puag ncig. Nyob rau hauv siab -concentration txo cov kua qaub, hydrofluoric acid los yog kub muaj zog alkaline nruab nrab, cov kev tiv thaiv passive zaj duab xis yog tshuaj etched thiab yaj tsis tu ncua. Cov titanium matrix tshiab tau nthuav tawm tom qab zaj duab xis poob tam sim ntawd dhau los ua anodic dissolution thiab nkag mus rau hauv nruab nrab hauv daim ntawv ntawm cov hlau ions. Txij li thaum cov txheej txheem tiv thaiv puas zoo ib yam tsis muaj qhov sib txawv hauv cheeb tsam, cov tshuaj tiv thaiv anodic corrosion tshwm sim synchronously ntawm tag nrho cov wetted nto. Cov hlau matrix yog noj txheej los ntawm txheej ntawm tus nqi ruaj khov corrosion. Ntev - lub sij hawm cumulative cov ntaub ntawv poob ua rau tag nrho cov phab ntsa thinning, txo cov yam ntxwv lub zog thiab muaj peev xwm rupture nyob rau hauv ua hauj lwm siab.
2. Tej hauj lwm uas raug rau Uniform Corrosion
Pem hauv ntej tube nto tag nrho rau hauv hydrofluoric acid, kub concentrated acid thiab muaj zog txo nruab nrab txhua xyoo puag ncig;
Sab nrauv phab ntsa raug corrosive acid pos huab, condensate thiab oxidative flue gas rau lub sij hawm ntev;
Cov khoom siv ua haujlwm ntawm ntau tshaj - qhov kub thiab txias uas ua rau kom tag nrho cov kev sib cais ntawm cov yeeb yaj kiab passive;
Cov yeeb nkab ntu yam tsis muaj hauv ob sab phlu lossis txheej tiv thaiv thiab ncaj qha rau hauv kev sib cuag nrog cov txheej txheem nruj heev;
Idle pipelines kaw nrog cov dej khib nyiab uas nyob hauv lub sijhawm ntev - kaw.
3. Cov ntsiab lus tseem ceeb ua kom lub cev muaj zog corrosion
High concentration ntawm fluoride ions, muaj zog acid thiab txo cov khoom hauv nruab nrab ua haujlwm;
Cov kev pabcuam kub siab heev uas ua rau cov tshuaj tiv thaiv zoo heev ntawm cov yeeb yaj kiab dissolution;
Nruam nruab nrab scouring stripping tshiab tsim nyias passive zaj duab xis ua ntej nws stabilizes;
Tsis tu ncua anodic oxidation lossis passivation txij nkawm los kho cov txheej txheem tiv thaiv;
Tsis txaus tsim phab ntsa thickness margin los tiv nrog ntev -lub sij hawm nruab nrab thickness attenuation.
4. Ntau-dimensional Whole-Txuas Kev Tiv Thaiv Kev Ntsuas
① Ntxiv lub hom phiaj corrosion inhibitors rau nruab nrab
Tsim cov txheej txheem tiv thaiv adsorption kom qeeb cov txheej txheem dissolution ntawm titanium substrate.
② Ua raws li kev kho mob anodic oxidation passivation
Reconstruct ib tug thickened thiab ruaj khov oxide zaj duab xis los kho deg los tiv thaiv -corrosion kev ua tau zoo tsis tu ncua.
③ Siv cov tshuaj tiv thaiv sab nraud -corrosion txheej lossis PFA hauv ob sab phlu cais
Ua tiav cais cov khoom siv titanium los ntawm corrosive kua thiab atmospheric ib puag ncig.
④ Npaj cov phab ntsa thickness tshuaj xyuas
Saib xyuas cov thickness poob dynamically thiab npaj kho lossis hloov ua ntej tshaj qhov kev nyab xeeb.
⑤ Txo qhov nruab nrab kub thiab corrosant concentration nyob rau hauv ntau lawm tso cai
Txo cov tshuaj tiv thaiv tsav tsheb kom txo qis tus nqi corrosion tag nrho hauv paus.
5. Kev Tiv Thaiv Cov Teeb Meem Sib piv
表格
| Kev Pabcuam & Kev Tiv Thaiv Hom | Uniform Corrosion Risk | Pom zoo Plan Optimization Plan |
|---|---|---|
| Bare titanium yeeb nkab + siab -kub fluorine- muaj corrosive nruab nrab | Ceev tag nrho phab ntsa nyias nyias thiab muaj kev nyab xeeb | Ntxiv cov inhibitor lossis txais kev tiv thaiv hauv ob sab phlu tsis ncua |
| Cov yeeb nkab liab qab + tsis tu ncua passivation + thickness xyuas | Zoo tswj qhov nruab nrab corrosion ceev | Standard kev ua haujlwm txhua hnub specification |
| Sab hauv + txheej txheej + nruab nrab corrosion inhibition | Tsawg kawg tag nrho cov khoom poob nyiam | Cov kev ua haujlwm hnyav corrosive nyiam cov txheej txheem |
Xaus
Uniform corrosion ntawm titanium cua sov raj pib los ntawm kev sib xyaw ua ke ntawm TiO₂ passive zaj duab xis thiab txawm tias noj ntawm titanium matrix. Cov tswv yim tiv thaiv tseem ceeb suav nrog kev cais cov substrate los ntawm cov xov xwm corrosive, kho cov oxide tiv thaiv txheej tsis tu ncua, ua kom cov tshuaj tiv thaiv electrochemical nrog cov tshuaj ntxiv, thiab tshem tawm cov kev phom sij zais cia ua ntej los ntawm kev tshawb pom lub sijhawm ntev. Kev ua kom zoo tshaj plaws ntawm cov txheej txheem tsis zoo, kev saib xyuas saum npoo thiab cov qauv kev tiv thaiv tuaj yeem tiv thaiv cov cuab yeej tsis ua haujlwm los ntawm lub sijhawm ntev - txawm tias corrosion thinning.
