Tshuaj corrosion
Cov pa phem hauv qhov chaw: Cov roj, plua plav, kua qaub, alkali, ntsev, thiab lwm yam uas txuas rau saum npoo ntawm lub workpiece yog hloov mus rau hauv corrosive media nyob rau hauv tej yam kev mob, thiab chemically reacts nrog ib co Cheebtsam nyob rau hauv stainless hlau qhov chaw, uas ua rau cov tshuaj corrosion thiab xeb. .
Deg khawb: Qhov kev puas tsuaj rau cov yeeb yaj kiab passivation los ntawm ntau yam khawb txo qhov kev tiv thaiv muaj peev xwm ntawm cov hlau tsis muaj steel, thiab nws yooj yim rau kev cuam tshuam nrog cov tshuaj lom neeg, ua rau cov tshuaj corrosion thiab xeb.
Ntxuav: Tom qab pickling thiab passivation, ntxuav tsis huv, ua rau cov kua seem seem, uas ncaj qha corrodes stainless hlau qhov chaw (tshuaj corrosion).
Electrochemical corrosion kuj
Carbon steel pollution: Cov khawb thiab corrosive nruab nrab tshwm sim los ntawm kev sib cuag nrog carbon steel qhov chaw tsim ib lub roj teeb thawj thiab ua rau electrochemical corrosion.
Txiav: Cov adhesion ntawm xeb- cov khoom siv yooj yim xws li txiav slag thiab txaws thiab cov nruab nrab corrosive tsim lub roj teeb tseem ceeb los tsim cov tshuaj electrochemical corrosion.
Lub tsev kawm ntawv ci: Cov khoom sib xyaw thiab cov qauv metallographic ntawm cov nplaim hluav taws kub qhov chaw hloov pauv tsis sib xws, thiab tsim cov roj teeb galvanic nrog cov nruab nrab corrosive los tsim electrochemical corrosion.
Vuam: Lub cev tsis xws luag (undercut, pores, tawg, tsis muaj fusion, tsis muaj kev nkag mus, thiab lwm yam) thiab tshuaj tsis xws luag (coarse grains, tsis zoo chromium ntawm grain ciam, cais, thiab lwm yam) nyob rau hauv lub vuam cheeb tsam thiab corrosive media form galvanic cells. los tsim electrochemical corrosion.
Khoom siv: Chemical defects (tsis sib xws muaj pes tsawg leeg, S, P impurities, thiab lwm yam) thiab nto lub cev tsis xws luag (porosity, hlwv, tawg, thiab lwm yam) ntawm stainless hlau yog conducive rau tsim galvanic hlwb nrog corrosive media los tsim electrochemical corrosion.
Passivation: Cov nyhuv passivation ntawm pickling tsis zoo, uas ua rau tsis sib xws los yog nyias passive zaj duab xis nyob rau saum npoo ntawm stainless hlau, uas yog ib qho yooj yim los tsim electrochemical corrosion.
Kev Tu: Qhov seem ntawm pickling passivation residue thiab cov khoom siv tshuaj corrosion ntawm stainless hlau daim ntawv electrochemical corrosion nrog stainless hlau qhov chaw.
Kev ntxhov siab concentration yog qhov ua rau muaj kev ntxhov siab corrosion
Nyob rau hauv luv luv, vim nws tshwj xeeb metallographic qauv thiab nto passivation zaj duab xis, stainless hlau yog feem ntau nyuaj rau corroded los ntawm cov tshuaj tiv thaiv nrog nruab nrab, tab sis nws yuav tsis tau corroded nyob rau hauv tej yam kev mob. Nyob rau hauv lub xub ntiag ntawm corrosive media thiab incentives (xws li khawb, splashes, txiav slag, thiab lwm yam), stainless hlau kuj yuav corroded los ntawm qeeb tshuaj thiab electrochemical cov tshuaj tiv thaiv nrog corrosive media, thiab tus nqi corrosion yog heev ceev nyob rau hauv tej yam kev mob. Rust phenomena, tshwj xeeb tshaj yog pitting thiab crevice corrosion. Cov txheej txheem corrosion ntawm stainless hlau qhov chaw feem ntau yog electrochemical corrosion.
Yog li ntawd, tag nrho cov kev ntsuas zoo yuav tsum tau ua thaum lub sij hawm ua cov khoom siv stainless hlau kom tsis txhob muaj corrosion thiab kev txhawb zog ntau npaum li qhov ua tau. Qhov tseeb, ntau yam xeb thiab inducements (xws li khawb, txaws, txiav slag, thiab lwm yam) kuj muaj qhov cuam tshuam loj rau qhov zoo ntawm cov khoom, thiab yuav tsum tau kov yeej.
