Hydrogen embrittlement brittle fracture tsis ua hauj lwm hais txog atomic hydrogen generated los ntawm electrochemical corrosion, pickling cov tshuaj tiv thaiv thiab cathode tiv thaiv permeating rau sab hauv ntawm titanium cua sov raj hlau lattice. Hydrogen atoms sib sau ua ke raws li cov ciam teb, dislocations thiab sab hauv micro defects los ua titanium hydride brittle theem. Cov khoom ductility thiab toughness poob sharply, me me microcracks sprout nyob rau hauv lub sab hauv residual kev nyuaj siab, nruab nrab siab thiab thermal alternating load. Cov kab nrib pleb nthuav dav sai raws thaj chaw hydride aggregation, nws thiaj li ua rau lub cev tawg sai sai ntawm cov yeeb nkab lub cev yam tsis muaj qhov pom tseeb ntawm cov yas deformation. Qhov tsis ua hauj lwm no muaj zog dheev, feem ntau ua rau cov kav xa dej snap tawg thiab nruab nrab ejection nyob rau hauv siab- bearing cua sov pipelines nrog pickling tu thiab txo nruab nrab.
1. Hydrogen Infiltration thiab Hydride Brittleness Mechanism
Titanium muaj cov solubility siab heev rau hydrogen atoms nyob rau hauv qhov kub thiab txias thiab acidic txo ib puag ncig. Thaum lub sij hawm corrosion thiab acid ntxuav, hydrogen ions tau electrons thiab tig mus rau hauv active hydrogen atoms, uas nkag mus rau hauv cov hlau nto thiab diffuse mus rau hauv matrix sab hauv. Hydrogen accumulates ntawm cov yam ntxwv tsis xws luag thiab precipitates koob -zoo li brittle titanium hydride, uas splits cov hlau lis ciam qauv. Nyob rau sab nraud quab yuam lossis thermal stress, microcracks germinate ntawm hydride faib chaw thiab propagate transgranularly thiab intergranularly. Tsis zoo li qaug zog tawg nthuav dav nrog ntev - lub sij hawm cyclic loading, hydrogen embrittlement belongs rau cov khoom intrinsic toughness deterioration, thiab tawg tshwm sim instantaneously ib zaug qhov tseem ceeb hydrogen concentration yog ntau tshaj.
2. Tej yam hauj lwm muaj kev puas tsuaj rau Hydrogen Embrittlement
Welded pob qij txha thiab cua sov- thaj tsam cuam tshuam nrog cov nplej ntxhib thiab ntau cov lattice tsis xws luag;
Cov kav dej tau raug tshem tawm thiab tshuaj ntxuav tsis tau tom qab dehydrogenation kho;
Pipeline qhov chaw nyob rau hauv ntau dhau impressed tam sim no cathodic tiv thaiv ua rau overprotection hydrogen evolution;
Sab hauv phab ntsa hauv qhov ntev - kev sib cuag nrog txo cov kua qaub nruab nrab thiab hydrogen - muaj cov txheej txheem dej;
Txias- ua tiav khoov cov yeeb nkab ntu nrog cov seem loj hauv kev ntxhov siab thiab yooj yim hydrogen enrichment.
3. Core Inducing Factors Accelerating Embrittlement Failure
Pickling daws tsis muaj hydrogen inhibition Cheebtsam, thiab ib tug loj npaum li cas ntawm nascent hydrogen yog generated thaum derusting;
Tsis muaj dehydrogenation ci txheej txheem tom qab cov kua qaub ntxuav thiab vuam siv;
Cathodic kev tiv thaiv tsis muaj teeb meem tsis tsim nyog nrog ntau lub peev xwm ua rau muaj kev kub ntxhov hydrogen evolution cov tshuaj tiv thaiv;
Kev xa tawm nruab nrab muaj cov khoom siv txo qis kom tsis tu ncua tsim hydrogen permeation qhov chaw;
Titanium cov kav dej khaws cov kev ntxhov siab ntau ntxiv tom qab khoov thiab tsim, ua kom nrawm nrawm pib ua haujlwm hauv hydrogen.
4. Tag nrho -Txuas Kev Tiv Thaiv thiab Tswj Kev Ntsuas Kev Ntsuas
① Ntxiv cov hydrogen corrosion inhibitors rau pickling kua los suppress hydrogen atom tiam
Txiav tawm hydrogen infiltration qhov chaw thaum lub sij hawm tshuaj ntxuav hauv paus.
② Siv qis-kub dehydrogenation tshav kub preservation ci kho tom qab vuam thiab kua qaub ntxuav
Tsav tawm diffusible hydrogen nyob rau hauv cov hlau lattice kom tshem tawm hydride nag lossis daus tej yam kev mob.
③ Precisely kho cathodic tiv thaiv muaj peev xwm kom tsis txhob overprotection thiab hydrogen evolution cov tshuaj tiv thaiv
Txwv lub peev xwm cathode nyob rau hauv qhov chaw nyab xeeb tiv thaiv hydrogen embrittlement.
④ Txhim kho cov kav dej ua kom zoo dua qub thiab tshem tawm cov ntawv tshaj tawm - ua cov kev ntxhov siab seem ntawm kev ntxhov siab annealing
Txo qhov chaw tsis xws luag rau hydrogen aggregation thiab tawg propagation.
⑤ Tsis tu ncua ua ultrasonic qhov tsis pom kev thiab tshuaj xyuas cov ntsiab lus hydrogen rau lub siab tseem ceeb-cov kab yeeb nkab seem
Tshuaj ntsuam tawm thaum ntxov hydrogen-induced microcracks ua ntej nkig tawg.
5. Kev Tiv Thaiv Cov Teeb Meem Sib piv
表格
| Kev tsim kho & kev tiv thaiv hom | Hydrogen Embrittlement Fracture Risk | Daim ntawv thov tswv yim |
|---|---|---|
| Uninhibited pickling + tsis muaj kev kho dehydrogenation + tshaj - tiv thaiv cathodic tiv thaiv | Sudden brittle fractures tshwm sim nyob rau hauv siab -cov kabmob ua haujlwm lub sijhawm | Ntxiv dehydrogenation ci thiab kho qhov kev tiv thaiv kev teeb tsa |
| Pickling nrog inhibitor + txheej txheem dehydrogenation txheej txheem + kev tiv thaiv muaj peev xwm tswj tau raug | Ua zoo txwv hydrogen intrusion thiab hydride brittle theem nag lossis daus | Txuj kev tsim kho tshwj xeeb rau siab-cov kabmob titanium cua sov cov kav dej vuam thiab kev saib xyuas |
| Tshaj tawm -weld ib qho kev ntxhov siab nyem + kev tiv thaiv online muaj peev xwm tiag tiag- lub sijhawm saib xyuas + cov khoom siv ua haujlwm ib xyoos ib zaug | Tsis tshua muaj sdden brittle breakage thiab nruab nrab leakage kev nyab xeeb kev nyab xeeb | Cov tswv yim nyiam rau siab -siab txo nruab nrab titanium los tiv thaiv -corrosion cua sov yeeb nkab network tej yaam num |
Xaus
Titanium cua sov tube hydrogen embrittlement tsis ua hauj lwm yog tshwm sim los ntawm hydrogen atoms nkag mus rau hauv cov hlau matrix los ua brittle titanium hydride, uas induces ceev nrooj expansion thiab brittle puas nyob rau hauv kev ntxhov siab. Cov kev tiv thaiv tseem ceeb suav nrog kev ntxiv cov tshuaj tua kab mob, kho cov kev kho cua sov dehydrogenation, ua kom zoo dua cov kev tiv thaiv cathodic, tshem tawm cov txheej txheem kev ntxhov siab thiab ua kom pom qhov tsis zoo thiab kuaj cov ntsiab lus hydrogen. Tag nrho - txheej txheem kaw- kev tswj lub voj voog ntawm kev ua cov raj xa dej, kev ua haujlwm tu thiab kev tiv thaiv kev tiv thaiv - kev tiv thaiv kev tiv thaiv kab mob tuaj yeem tiv thaiv kev puas tsuaj tam sim ntawd thiab kev nyab xeeb tshwm sim los ntawm hydrogen embrittlement ntawm titanium cua kub siab pipelines.
