1.What yog cov kev pheej hmoo tseem ceeb?
Galvanic nyhuv ua rau poob nrawm ntawm zinc txheej
Kev Ua Tau Zoo: Cov txheej txheej zinc ntawm cov pob qij txha sib xyaw yuav corrode 3-5 zaug sai dua li thaum siv ib leeg. Nyob rau lub sijhawm luv luv ntawm lub sijhawm (ob peb hlis rau 1 xyoos), zinc txheej yuav tev tawm thiab nthuav tawm hauv qab, uas yuav ua rau xeb ntawm cov hauv paus steel. Yog tias ib puag ncig muaj chloride ions (xws li ntug dej hiav txwv, chaw nyob, thiab lub caij ntuj no daus metloting thaj chaw), tus nqi corrosion yuav ua kom nrawm dua.
Cov phom sij ntawm "kev txhim kho corrosion" ntawm stainless hlau
Yog tias cov hlau stainless yog cov hlau uas tsis-ruaj khov, cov pa roj carromium los ua ke nrog cov chromium carbide, ua rau txo qis hauv cov ntsiab lus chromium ntawm cov ciaj ciam nplej. Nyob rau lub sijhawm no, cov zinc ions produced los ntawm corrosion ntawm lub galvanized txheej, ua rau pom kev sib txuas ntawm cov hlau uas tsis muaj xim, thiab ua rau muaj cov khoom siv ntse hauv cov khoom siv.
2.Qhov dab tsi muaj kev pheej hmoo ntawm lub cev tsis sib xws?
Electrochemical muaj peev xwm sib txawv ntawm qhov chaw tiv tauj ua rau cov teeb meem "galvanic"
Txawm hais tias tsis muaj qhov pom tseeb electrolyte yog tsim, kev sib cuag ntawm ob cocurrent vim muaj kev sib ze ntawm lub zinc sib txawv ntawm lub sijhawm ntev, kev tsim cov kev sib tw ntev, ua cov nyom corrosion.
Yog tias muaj kev co lossis kev ntxhov siab, kev sib txhuam ntawm qhov sib tham yuav ua kev puas tsuaj zinc txheej thiab cov stainless hlau passivation zaj duab xis, txuas ntxiv ua phem rau kev xeb kev corrosion.
Qhov sib txawv ntawm cov coefficiention stickal ua rau xoob kev sib txuas
Lub thermal nthuav coefficients ntawm galvanized steel thiab stainless hlau sib txawv. Nyob rau hauv ib puag ncig nrog kev hloov pauv kub thiab cua sov thiab kev cog lus yuav ua rau muaj kev sib txawv, thiab kev nkag siab ntawm cov pa dej thiab cov pa paug los ua kom nrawm nrawm.
3.Cov ib puag ncig cov kev pheej hmoo?
Vaum / muaj ntsev nyob ib puag ncig (xws li cov ntug dej hiav txwv thiab cov tshuaj lom neeg kev lag luam)
Dej vapor yuav dhau los ua electrolyte, nrawm lub cell tus kheej; Chloride ions yuav txig cov tuab tuab thiab stainless hlau passivation zaj duab xis, ua rau "pitting corrosion" lossis "crevice corrosion".
Kev kub siab / siab vaum ib puag ncig (xws li chav ua noj, chav dej)
Kev kub siab yuav ua kom nrawm tshuaj lom neeg cov tshuaj tiv thaiv kev nrawm nrawm, thiab cov av noo yuav ua rau cov khoom siv corrosion, ua rau cov khoom siv corrosion (zinc ideroxide) kom plam. Nyob rau tib lub sijhawm, kev ruaj ntseg ntawm cov zaj duab xis passive ntawm stainless hlau txo qis ntawm cov kub, ua rau nws yooj yim dua los ntawm zinc corrosion khoom.
4.What yog cov kev pheej hmoo ntxiv ntawm txoj kev sib txuas tsis sib txuas?
Kev Sib Txuas Ncaj Ncees
Yog hais tias ob tug ncaj qha belted lossis welded, qhov chaw loj dua, qhov dav ntawm thaj chaw "ntawm electrochemical corrosion. Thaum lub sij hawm vuam, qhov kub kub yuav rhuav tshem lub galvanized txheej, thiab tseem tuaj yeem ua rau cov ntsiab lus chromium weld kom txo qis, ua rau thaj chaw "corrosion tsis muaj zog."
Yog tias muaj qhov khoob hauv cov pob qij txha sib xyaw, cov pa dej thiab cov hnoos qeev kom muaj ntau dua, cov tshuaj corrosion ntau dua li cov pob zeb uas muaj zog ntau dua, thiab cov corrosion hauv nroog yog aggravion hauv zos yog aggravion).
5.Qhov dab tsi tshwm sim ntawm kev pheej hmoo?
Txheej txheem kev nyab xeeb: Tom qab cov txheej galvanized tsis ua, cov pase carbon hlau yuav nrawm nrawm (xws li ntsia liaj qhov rooj thiab cov khoom deformation); Yog tias stainless hlau undergoes intergranular corrosion, nws yuav poob nws txoj kev nruj thiab yuav tawg nrawm rau kev ntxhov siab.
Surge nyob rau hauv kev txij nkawm cov nqi: corrosion nyob rau hauv tov sib xyaw yog feem ntau tsis ncaj thiab zais, yuav tsum tau hloov cov khoom siv thaum ntxov, thiab rov ua kom muaj zog nyob rau hauv tom qab theem. Tus nqi kho tus nqi yuav yog 3-5 zaug uas siv ib qho khoom siv nkaus xwb.
Luv Luav, hauv ib puag ncig hnyav, lub neej kev pabcuam lub neej ntawm cov khoom sib txuas sib luag tej zaum yuav tsuas yog 1 / 3-1 / 2 ntawm cov khoom siv tau ua los ntawm ib qho khoom siv.