Dab tsi corrosive media tuaj yeem tiv thaiv corrosion stainless hlau hlau nplaum twj tso kua mis?

Stainless hlau magnetic twj tso kua mis muaj kev tiv thaiv corrosion. Cov khoom siv hlau tsis muaj steel muaj xws li 304, 316L, thiab lwm yam. Cov khoom siv ob no feem ntau yog siv hauv cov twj siv hlau stainless hlau nplaum. Rau kev xa cov dej muaj zog corrosive, qhov twg yog qhov kev txwv ntawm kev tiv thaiv corrosion ntawm stainless hlau? Qhov nruab nrab yuav tsum tau thauj muaj yim yam tseem ceeb ntawm corrosion ntawm hlau magnetic twj tso kua mis: electrochemical corrosion, uniform corrosion, intergranular corrosion, pitting corrosion, crevice corrosion, kev nyuaj siab corrosion, hnav corrosion, thiab cavitation corrosion.

1. Pitting corrosion
Pitting corrosion yog ib hom kev txhim kho hauv zos. Vim yog lub zos kev puas tsuaj ntawm cov hlau passivation zaj duab xis, hemispherical pits yog sai sai tsim nyob rau hauv ib tug tej lub zos cheeb tsam ntawm cov hlau nto, uas yog hu ua pitting corrosion. Pitting corrosion feem ntau yog tshwm sim los ntawm CL￣. Txhawm rau tiv thaiv pitting corrosion, Mo-muaj hlau (feem ntau 2.5% Mo) tuaj yeem siv tau, thiab nrog kev nce ntawm CL￣ cov ntsiab lus thiab kub, cov ntsiab lus Mo yuav tsum tau nce raws li.

2. Crevice corrosion
Crevice corrosion yog ib hom kev txhim kho hauv zos, uas yog hais txog qhov corrosion tshwm sim los ntawm kev puas tsuaj hauv zos ntawm cov hlau passivation zaj duab xis vim qhov txo qis ntawm cov pa oxygen thiab (lossis) pH txo qis hauv qhov crevice tom qab lub crevice tau ntim cov kua corrosive. Stainless hlau crevice corrosion feem ntau tshwm sim hauv CL￣ daws. Crevice corrosion thiab pitting corrosion yog heev zoo sib xws nyob rau hauv lawv tsim mechanism. Ob leeg yog tshwm sim los ntawm lub luag haujlwm ntawm CL￣ thiab kev puas tsuaj hauv zos ntawm cov yeeb yaj kiab passivation. Nrog rau qhov nce ntawm CL￣ cov ntsiab lus thiab qhov kub thiab txias, qhov ua tau ntawm crevice corrosion nce. Kev siv cov hlau uas muaj cov ntsiab lus Cr thiab Mo siab tuaj yeem tiv thaiv lossis txo qhov kev xeb ntawm crevice.

3. Uniform corrosion
Uniform corrosion hais txog cov tshuaj tsis sib xws ntawm tag nrho cov hlau nto thaum cov kua corrosive hu rau cov hlau nto. Qhov no yog cov feem ntau thiab tsawg kawg yog teeb meem daim ntawv ntawm corrosion.
Cov kev ntsuas los tiv thaiv kev xeb tsis sib xws yog: txais cov khoom tsim nyog (xws li cov hlau tsis yog hlau), thiab txiav txim siab txaus corrosion nyob rau hauv lub twj tso kua mis tsim.

4. Cavitation corrosion
Lub corrosion tshwm sim los ntawm cavitation nyob rau hauv lub magnetic twj tso kua mis yog hu ua cavitation corrosion. Txoj kev ua tau zoo tshaj plaws thiab yooj yim los tiv thaiv cavitation corrosion yog tiv thaiv cavitation los ntawm qhov tshwm sim. Rau cov twj uas feem ntau raug kev txom nyem los ntawm cavitation thaum lub sijhawm ua haujlwm, kom tsis txhob muaj cavitation corrosion, cavitation-resistant cov ntaub ntawv yuav siv tau, xws li nyuaj alloy, phosphor bronze, austenitic stainless hlau, 12% chromium hlau, thiab lwm yam.

5. Kev ntxhov siab corrosion
Kev ntxhov siab corrosion yog hais txog ib hom kev txhim kho hauv zos uas tshwm sim los ntawm kev sib koom ua ke ntawm kev ntxhov siab thiab corrosive ib puag ncig.
Austenitic Cr-Ni steel yog qhov yooj yim rau kev ntxhov siab corrosion hauv CL ~ nruab nrab. Nrog rau qhov nce ntawm CL￣ cov ntsiab lus, qhov kub thiab txias, kev ntxhov siab corrosion yog qhov tshwm sim ntau dua. Feem ntau, kev ntxhov siab corrosion tsis tshwm sim hauv qab 70 ~ 80 ° C. Kev ntsuas los tiv thaiv kev ntxhov siab yog siv austenitic Cr-Ni steel nrog cov ntsiab lus Ni siab (Ni yog 25% ~ 30%).

6. Electrochemical corrosion
Electrochemical corrosion yog hais txog cov txheej txheem electrochemical nyob rau hauv uas qhov sib cuag ntawm cov hlau tsis sib xws ua lub roj teeb vim qhov sib txawv ntawm electrode muaj peev xwm ntawm cov hlau, yog li ua rau corrosion ntawm cov hlau anode.
Kev ntsuas los tiv thaiv electrochemical corrosion: Ua ntej, nws yog qhov zoo tshaj plaws los siv tib cov khoom siv hlau rau cov dej ntws ntawm lub twj tso kua mis; Thib ob, siv cov anodes sacrificial los tiv thaiv cov hlau cathode.

7. Intergranular corrosion
Intergranular corrosion yog ib hom kev xeb hauv zos, uas feem ntau yog hais txog nag lossis daus ntawm chromium carbide ntawm stainless hlau nplej. Intergranular corrosion yog heev corrosive rau stainless hlau cov ntaub ntawv. Cov khoom siv nrog intergranular corrosion poob nws lub zog thiab plasticity yuav luag tag.
Cov kev ntsuas los tiv thaiv intergranular corrosion yog: annealing stainless hlau, los yog siv ultra-low carbon stainless hlau (C<0.03%).

8. Hnav thiab corrosion
Abrasion corrosion yog hais txog ib hom kev yaig corrosion ntawm high-speed kua ntawm cov hlau nto. Cov kua dej erosion yog txawv los ntawm kev yaig los ntawm cov khoom siv hauv nruab nrab.
Cov khoom sib txawv muaj qhov sib txawv los tiv thaiv kev hnav thiab corrosion. Qhov kev txiav txim ntawm hnav thiab corrosion kuj los ntawm cov neeg pluag mus rau zoo yog: ferritic Cr steel