Corrosion yog txheej txheem ntuj tsim, uas cov hlau maj mam raug rhuav tshem los ntawm cov txheej txheem tshuaj lom neeg lossis electrochemical thaum sib cuag nrog nws ib puag ncig.Qhov chaw ntawm corrosion yog pH, CO2, H2S, chlorides, oxygen thiab kab mob.Roj los yog roj yog hu ua "qaub" thaum cov concentration ntawm hydrosulfide, H2S, siab dua li feem ntau.Oxygen yog teeb meem heev ntawm cov qhov dej txhaj tshuaj, EOR.Twb tsis tshua muaj siab ua rau siab corrosion.Hauv qhov no, siv cov pa oxygen scavangers.
Cov kab mob tuaj yeem loj hlob hauv cov kav dej thiab cov tso tsheb hlau luam nyob rau hauv cov xwm txheej anaerobic, uas ua rau muaj qhov siab ntawm H2S.Pitting yog qhov tshwm sim ntawm qhov no thiab tuaj yeem ua rau hnyav.Bacteria build-up feem ntau tshwm sim nyob rau hauv daim ntawv thov qis tshaj.Lwm yam tseem ceeb rau corrosion yog kub, abrasion, siab, tshaj tawm thiab muaj cov khoom khib nyiab.
Peb paub cov nram qab no hom ntawm corrosion:
1. Local corrosion: pitting, crevice corrosion, filiform corrosion
2. Galvanic corrosion
3. General nres corrosion
4. Flow-pas pab corrosion, FAC
5. Intergranular corrosion
6. De-alloying
7. Ib puag ncig tawg: kev ntxhov siab, qaug zog, H2-induced, kua hlau embrittlement
8. Fretting corrosion
9. Kub kub corrosion
Txhawm rau tiv thaiv corrosion, cov kev ntsuas hauv qab no yog qhov tseem ceeb rau kev hais txog:
● Ua qhov tshwj xeeb hauv kev xaiv cov khoom tsim nyog.Cov kws tshaj lij metallurgic txhais cov hlau uas zoo tshaj plaws los siv.
● Tsis tas li txheej thiab pleev xim yog cov ntsiab lus tseem ceeb los xaiv zoo.
● Kho ntau lawm kom nce lossis txo qhov nrawm hauv cov yeeb nkab.
● Nyob rau hauv cov ntaub ntawv hais tias muaj nyob rau hauv cov kua, qhov txo qis yuav zoo dua rau lub neej ntawm cov twj paj nruag thiab cov kav dej.
● Tswj cov pH, txo cov chloride kom muaj nuj nqis, tshem tawm cov pa oxygen thiab cov kab mob thiab txo cov hlau oxidation nrog cov tshuaj txhaj tshuaj.
● Cov tshuaj muaj txiaj ntsig zoo thiab muaj txiaj ntsig zoo tshaj plaws los tswj lub siab hauv cov kav dej lossis lub nkoj uas cov kua dej yuav tsum nkag mus.
Post lub sij hawm: Apr-27-2022