1.Dab tsi yog galvanic corrosion?
Thaum ob lub hlau uas muaj qhov sib txawv (xws li hlau thiab txhuas) tuaj rau hauv kev sib cuag ncaj qha hauv cov tshuaj electrolyte (xws li dej los yog huab cua ntub), ib lub cell galvanic tsim. Cov hlau reactive ntau dua (nrog rau qhov tsis zoo electrode ntau dua) ua raws li cov anode thiab corroded sai dua, thaum cov hlau tsis tshua muaj zog (nrog rau qhov muaj peev xwm zoo electrode) ua raws li cathode thiab tiv thaiv.
2.Leej twg yog tus neeg raug tsim txom hauv cov hlau - txhuas ua ke?
Nyob rau hauv feem ntau ib puag ncig, aluminium yog ntau reactive tshaj hlau. Yog li ntawd, nyob rau hauv no galvanic ob peb:
Anode (ua corroded): Aluminium coil
Cathode (tiv thaiv): Txias -khoov steel kauj
Lub corrosion tam sim no ntws los ntawm txhuas mus rau cov hlau, ua rau cov txhuas yuav tsum tau ceev thiab hauv zos corroded nyob ze ntawm qhov kev twb kev txuas, feem ntau manifesting li dawb txhuas oxide hmoov los yog pits ntawm lub txhuas qhov chaw.
3.Dab tsi yog cov txheej txheem tshwj xeeb thiab cov ntsiab lus muaj feem cuam tshuam nrog kev xeb?
Cov yam ntxwv tshwj xeeb ntawm cov ntsiab lus riveting:
Direct hlau-rau-hloov kev sib cuag: Rivets (txawm yog hlau lossis txhuas) tsim kom muaj kev sib cuag nruj ntawm cov hlau thiab txhuas ntawm lub qhov.
Gap: Riveting inevitably tsim me me qhov khoob uas yooj yim nqus dej noo thiab ntsev, tsim ib puag ncig corrosion thiab ua kom cov galvanic corrosion.
Txheej kev puas tsuaj: Txawm hais tias nws yog txheej txheej galvanized ntawm txias- dov steel los yog oxide zaj duab xis ntawm aluminium coils, cov txheej txheem drilling thiab riveting tuaj yeem ua rau lawv puas tsuaj, nthuav tawm lub hauv paus hlau thiab muab qhov pib rau corrosion.
Environmental factor:
Cov chaw ntub dej, tshuaj tsuag ntsev, thiab cov chaw ua haujlwm muaj cov khoom siv hluav taws xob zoo heev, ua kom cov galvanic corrosion zoo heev. Qhov no yog qhov laj thawj tseem ceeb vim li cas cov qauv no tsis ua haujlwm nyob rau sab nraum zoov lossis hauv hiav txwv.
4.Qhov hluav taws xob rwb thaiv tsev zoo li cas?
Siv cov insulating gaskets/washers: Muab cov khoom uas tsis yog{0}}cov khoom siv hluav taws xob nruab nrab ntawm cov hlau thiab txhuas qhov chaw, thiab nruab nrab ntawm lub taub hau / txiv ntseej thiab cov hlau. Cov ntaub ntawv feem ntau suav nrog:
Plastics: xws li nylon, polyethylene, thiab polytetrafluoroethylene.
Roj Hmab: xws li cov roj hmab neoprene.
Impregnated gaskets: xws li fiber ntau gaskets impregnated nrog sealant.
Siv cov txheej txheem insulating: Txau los yog ua raws li cov ntaub ntawv insulating, xws li cov hmoov txheej, asphalt kua roj vanish, los yog tshwj xeeb insulating compounds, mus rau qhov chaw sib cuag.
5.Yuav ua li cas xaiv txoj cai rivets thiab sealants?
Rivet Khoom: Aluminium lossis stainless hlau rivets yog nyiam (nco ntsoov tias tseem muaj qhov sib txawv ntawm stainless hlau thiab txhuas, tab sis nws yog me dua li ntawm cov hlau). Tsis txhob siv cov pa roj carbon zoo tib yam rivets.
Sealant/Structural Adhesive: Ua ntej riveting, siv cov sealant lossis qis -conductivity elastic nplaum rau cov mating nto. Qhov no tiv thaiv electrolyte los ntawm kev nkag mus rau qhov khoob thiab muab qee qhov kev tiv thaiv thiab lub zog txhua yam.