Crevice corrosion perforation tsis ua hauj lwm yog hais txog qhov khoob khoob uas tsim los ntawm cov kav dej titanium thiab cov yeeb nkab clamps, flanges, gaskets, kev txhawb nqa brackets thiab ceg tawv pob qij txha. Cov txheej txheem nruab nrab los yog condensed noo noo stagnates hauv cov me me occluded crevices. Cov pa oxygen yaj hauv qhov sib txawv yog noj sai los ntawm cov tshuaj tiv thaiv electrochemical, halogen ions tsis tu ncua mloog zoo nyob rau hauv qhov chaw kaw, titanium passivation zaj duab xis yog hauv zos puas, thiab cov pits corrosion nyiam tsim hauv qhov sib txawv. Corrosion txuas mus rau sab hauv raws cov yeeb nkab phab ntsa kom txog rau thaum nkag mus rau qhov tshwm sim, thaum lub ntsej muag sab nrauv ntawm cov yeeb nkab titanium tseem nyob hauv qhov qub. Qhov kev txhim kho hauv cheeb tsam no feem ntau tshwm sim hauv qhov sib txuas sib txuas thiab lub puab tsaig ntawm titanium siab pipelines hauv chloride- muaj ib puag ncig.
1. Crevice Occlusion thiab Corrosion Development Mechanism
Ib qho ruaj khov thiab tuab titanium dioxide passivation zaj duab xis tuaj yeem tsim rau ntawm qhov chaw qhib ntawm titanium hauv nruab nrab aerated los tiv thaiv corrosion. Nyob rau hauv qhov nqaim crevices, cov kua dej tsis tuaj yeem ncig thiab rov ua dua tshiab, cov pa oxygen yaj tau sai sai, tig lub pob zeb sab hauv mus rau hauv cov pa oxygen - cheeb tsam anodic tsis txaus. Chloride thiab bromide ions los ntawm sab nraud lub ntsiab nruab nrab txuas ntxiv mus rau hauv qhov sib txawv kom sib npaug, ua rau muaj kev nce siab hauv ion concentration thiab acidity hauv qhov crevice. Lub compact passivation txheej tsis tuaj yeem tiv taus yaig los ntawm siab -concentration halogen ions thiab tawg hauv zos, ua rau cov titanium matrix yaj tsis tu ncua. Cov khoom siv corrosion thaiv qhov sib txawv inlet thiab tswj cov occluded corrosive microenvironment, accelerating qhov nkag. Qhov sib txawv ntawm qhov sib txawv ntawm txhua qhov corrosion ntawm cov yeeb nkab phab ntsa, crevice corrosion yog txwv rau qhov chaw kaw thiab muaj zog zais hauv cov kev pabcuam thaum ntxov.
2. Tej yam hauj lwm ua rau Crevice Corrosion puas tsuaj
Tiv tauj qhov sib txawv ntawm titanium yeeb nkab sab nrauv phab ntsa thiab carbon steel los yog alloy yeeb nkab clamps thiab kev txhawb nqa;
Qhov me me ntawm flange sealing ntsej muag thiab tsis yog - puv - loj gaskets;
Lap vuam seams thiab overlapping sib dhos cov pob qij txha nrog kev nkag tsis tiav thiab cov seem seem;
Threaded kev twb kev txuas hauv paus qhov khoob qhov nruab nrab yooj yim accumulates thiab tsis tuaj yeem drained;
Rwb thaiv tsev txheej puas qhov chaw uas dej nag thiab condensate nkag mus rau hauv lub interlayer thiab daim ntawv nyob rau hauv cov slits.
3. Core Inducing Factors Accelerating Crevice Corrosion Failure
Kev tsim qauv tsis tsim nyog nrog ntau tus ncej puab thiab nqaim kev sib cuag slits yam tsis muaj dej ntws;
Kev ua tsis tiav ntawm cov gaskets thiab flanges thaum lub sijhawm teeb tsa, tawm hauv qhov tsis sib xws ntawm kev sib dhos;
Ntev - lub sij hawm tsub zuj zuj ntawm cov plua plav thiab cov kua hauv qhov khoob uas tsis muaj dej ntws tawm thiab ntxuav kom huv;
Nruab nrab muaj chloride, bromide thiab lwm yam halogen Cheebtsam uas muaj zog induce crevice corrosion;
Cov qauv crevice tsis tuaj yeem tso cov kua dej seem tom qab kaw, ua rau ntev -lub sij hawm soaking corrosion.
4. Tag nrho -Txuas Kev Tiv Thaiv thiab Tswj Kev Ntsuas Kev Ntsuas
① Ua kom zoo dua cov raj xa dej kom txo tau cov ncej puab thiab cov txheej txheem sib tshooj; txais yuav tag nrho nkag mus vuam kom tshem tawm cov zais zais
Hauv paus txo qis qhov tsim cov khoom tsim tawm hauv kev tsim.
② Xaiv ib qho tag nrho -Ntog matched gaskets rau flange kev sib txuas thiab tswj bolt nruj uniformity
Tsis txhob muaj qhov khoob ib nrab los ntawm eccentric compression.
③ Teem lub qhov dej thiab cov gradient layout rau qis -dej pipeline fittings kom ntseeg tau tias tsis muaj kua seem hauv qhov khoob
Txhaum kaw qhov nruab nrab qhov tsis zoo uas yuav tsum tau muaj rau crevice corrosion.
④ Tsis tu ncua disassemble qhov tseem ceeb ntawm kev sib txuas rau kev tu thiab tshem tawm kom tshem tawm cov khib nyiab hauv kev sib dhos
Tiv thaiv ion enrichment nyob rau hauv qhov chaw kaw.
⑤ Siv cov tshuaj tiv thaiv -corrosion sealing paste rau cov khoom sib dhos ua ke kom cais cov nruab nrab infiltration thiab qhov sib txawv
Thaiv cov channel rau corrosive nruab nrab nkag mus rau hauv cov qauv slit.
5. Kev Tiv Thaiv Cov Teeb Meem Sib piv
表格
| Tsim & Installation hom | Crevice Corrosion Risk | Daim ntawv thov tswv yim |
|---|---|---|
| Loj lap slit qauv + mismatched gaskets + tsis muaj dej tsim | Nkaum perforation leakage tshwm sim nyob rau hauv nruab nrab - lub sijhawm ua haujlwm | Hloov cov qauv hauv cov kav dej thiab ntxiv cov kua dej thiab kev sib khi rau qhov khoob |
| Integrated seamless structural tsim + standardized flange los ua ke + qhov sib txawv ntws configuration | Zoo tshem tawm occluded corrosion microenvironment thiab qhov loj hlob | Standard fabrication specification rau titanium cua sov siab pipeline engineering |
| Gap sealing tiv thaiv -kev kho corrosion + kev tshuaj xyuas peb lub hlis twg + nruab nrab halogen ion xyuas | Tsis tshua muaj concealed perforation to leakage | Cov tswv yim nyiam rau kev cob qhia tshuaj lom neeg ntau-fitting titanium cua sov pipeline systems |
Xaus
Titanium cua sov tube crevice corrosion tsis ua hauj lwm pib los ntawm qhov chaw nqaim nqaim ntxiab stagnant corrosive nruab nrab, ua rau siab -ion concentrated occluded ib puag ncig uas rhuav tshem cov titanium passivation zaj duab xis thiab ua rau lub qhov nkag mus. Cov txheej txheem kev tiv thaiv tseem ceeb suav nrog kev txhim kho cov qauv tsim kom txo tau cov slits, standardizing flange thiab threaded los ua ke precision, configure cov kua dej kom tshem tawm cov residual kua, tsis tu ncua tu qhov sib txawv attachments thiab nqa tawm qhov sib txawv sealing tiv thaiv. Tag nrho- txheej txheem kaw- kev tswj lub voj voog ntawm cov kav dej tsim qauv, kev tsim kho thaj chaw thiab kev saib xyuas kev saib xyuas niaj hnub tuaj yeem tiv thaiv kev kaw tsis tau xav txog thiab qhov nruab nrab ntawm cov dej xau tshwm sim los ntawm kev sib tsoo hauv zos corrosion ntawm titanium cua sov raj.
