Cathodic disbondment kuj thiab stray tam sim no tiv thaiv los tiv thaiv -corrosion txheej rau elastic caij nplooj ntoos hlav clips
Dab tsi yog "cathodic disbondment" ntawm txheej thiab nws tshwm sim li cas?
Cathodic disbondment yog qhov tshwm sim uas cov tshuaj tiv thaiv -corrosion coatings tshem tawm ntawm cov hlau substrate nyob rau hauv kev cuam tshuam ntawm stray tam sim no. Nyob rau hauv electrified railways, leaked stray tam sim no ua rau clip nto cathode ntawm electrochemical corrosion. Cov tshuaj tiv thaiv cathodic tsim hydroxide ions, uas nkag mus rau qhov sib cuam tshuam ntawm cov txheej thiab cov hlau. Nyob rau tib lub sijhawm, cov tshuaj tiv thaiv no rhuav tshem qhov sib txuas ntawm lub ntsej muag, tsim thiab nthuav dav qhov sib txawv ntawm cov txheej thiab hlau. Thaum kawg, txheej txheej delaminates los ntawm clip nto zoo li tev tawv nqaij, poob nws txoj haujlwm tiv thaiv.
Vim li cas metro clips qhia txog cathodic disbondment tsis kam ntau dua li cov pa tsheb ciav hlau?
Metro systems siv DC fais fab mov, ua kom muaj zog tam sim no ntau dua li AC -powered pa railways. Qhov av noo ib puag ncig thiab kev ua vaj tse ua vaj tse muab txoj hauv kev zoo tshaj plaws rau kev sib kis tam sim no. Raws li cov khoom siv hlau, cov clips muaj qhov cuam tshuam los ua cov ntsiab lus tso tawm tam sim no, raug kev txom nyem los ntawm electrochemical corrosion. Tsis zoo cathodic disbondment kuj ua rau cov txheej txheem sai sai nyob rau hauv kev sib xyaw ua ke tam sim no thiab cov av noo. Yog li, metro clips xav tau cov txheej txheem tshwj xeeb los tiv thaiv qhov delamination.
Kub-dip galvanizing thiab Dacromet coatings txawv li cas ntawm cathodic disbondment kuj?
Ib txwm kub-dip galvanizing muaj qhov zoo corrosion kuj tab sis tsis muaj zog cathodic disbondment kuj nyob rau hauv siab stray tam sim no ib puag ncig, nrog cov zinc-substrate interface yooj yim cuam tshuam. Dacromet coatings feature ib ntom, flake-zoo li zinc-chromate qauv nrog muaj zog adhesion rau lub substrate. Cov qauv no zoo thaiv cov ion nkag mus, tiv thaiv kev delamination txawm tias nyob rau hauv qhov kev cuam tshuam tam sim no. Yog li ntawd, Dacromet tau maj mam hloov kub -dip galvanizing raws li cov txheej txheem nyiam rau cov clips hauv cov metro thiab cov chaw siab tam sim no.
Yuav ua li cas tsis zoo cathodic disbondment kuj cuam tshuam rau txhua yam khoom ntawm clips?
Tom qab delamination, clip substrate yog ncaj qha mus rau ya raws thiab corrosion, sai sai tsim liab xeb. Xeb txo cov load zoo-cov kabmob hla-section, txo lub zog tensile thiab elastic modulus. Ntau qhov tseem ceeb, qhov ntim nthuav dav ntawm cov khoom siv corrosion tsim cov kev ntxhov siab sab hauv, ua kom qaug zog tawg pib. Rau clips, uas cia siab rau elastic deformation, seem poob thiab tawg ncaj qha ua rau ib tug ntse poob rau hauv clamping quab yuam. Thaum kawg, clips ua tsis tiav vim kev qaug zog corrosion, ua rau muaj kev nyab xeeb kev nyab xeeb.
Yuav ua li cas pom pom thaum ntxov -theem cathodic disbondment ntawm clips ntawm -site?
Clips ntsib cathodic disbondment feem ntau pom cov hlwv loj ntawm cov txheej txheej, ib qho cim ntawm kev sib cais substrate. Tapping cov hlwv no nrog cov khoom tawv ua rau lub suab hollow, txawv ntawm lub suab nrov ntawm cov xim tsis zoo. Raws li kev txhim kho corrosion, hlwv pob tawg, nthuav tawm xim liab - xim av xeb hauv qab. Tsis zoo li cov xeb xeb dav dav, kev tsis sib haum xeeb -induced corrosion feem ntau pib ntawm cov ces kaum tuag los yog cov ntsiab lus tiv tauj thiab kis tau ntau heev. Kev tshawb pom ntawm cov xwm txheej zoo li no ua rau muaj kev sim tam sim no nyob rau hauv cheeb tsam.