Kev tsim cov txheej txheem kub dip galvanized txheej yog nruab nrab ntawm cov hlau matrix thiab sab nraud ntawm cov zinc txheej ntshiab, tsim cov txheej txheem hlau-zinc alloy, lub workpiece nto hauv kub dip plating thaum tsim cov hlau-zinc alloy txheej, yog li ntawd. cov hlau thiab ntshiab zinc txheej yog zoo ua ke.Cov txheej txheem ntawm cov yob loj galvanized hlau tuaj yeem piav qhia yooj yim xws li: thaum cov hlau ua haujlwm tau muab tso rau hauv cov kua zinc molten, thawj zinc thiab α-hlau (lub cev-centered) cov khoom yaj yog tsim rau ntawm qhov sib txuas.Qhov no yog siv lead ua tsim los ntawm matrix hlau hlau yaj nrog zinc atoms nyob rau hauv lub xeev khoom.Ob lub atoms hlau yog fused nrog ib leeg, thiab qhov attraction ntawm cov atoms yog me me.
Yog li ntawd, thaum zinc ncav cuag saturation nyob rau hauv cov khoom yaj, ob lub ntsiab ntawm zinc thiab hlau atoms diffuse ib leeg, thiab zinc atoms diffused rau hauv (los yog infiltrated rau hauv) hlau matrix migrate nyob rau hauv lub lattice ntawm lub matrix thiab maj mam tsim ib tug alloy. nrog hlau, thaum cov hlau diffused rau hauv molten zinc kua ua ib qho intermetallic compound FeZn13 nrog zinc thiab dab dej rau hauv qab ntawm lub lauj kaub kub-dip galvanized, uas yog, zinc slag.Thaum lub workpiece raug tshem tawm los ntawm zinc leaching tov, nto ntawm cov ntshiab zinc txheej yog tsim, uas yog hexagonal siv lead ua, thiab nws cov ntsiab lus hlau tsis ntau tshaj 0.003%.
Kub dip galvanizing, tseem hu ua kub dip galvanizing, yog ib txoj hauv kev tau txais cov hlau npog txheej los ntawm kev muab cov neeg hlau rau hauv cov kua zinc molten.Nrog rau txoj kev loj hlob sai ntawm high-voltage fais fab kis tau tus mob, kev thauj mus los thiab kev sib txuas lus, kev tiv thaiv kev tiv thaiv rau steel qhov chaw tau dhau los ua siab dua thiab siab dua, thiab qhov kev thov rau kub-dip galvanizing kuj nce.Feem ntau lub thickness ntawm electrogalvanized txheej yog 5 ~ 15μm, thiab cov yob loj galvanized hlau txheej feem ntau yog ntau tshaj 35μm, los yog txawm mus txog 200μm.Kub dip galvanized txheej muaj peev xwm zoo, tuab txheej, tsis muaj organic inclusions.
Raws li peb txhua tus paub, cov txheej txheem ntawm kev tiv thaiv atmospheric corrosion ntawm zinc suav nrog kev tiv thaiv kev tiv thaiv thiab electrochemical tiv thaiv.Nyob rau hauv cov xwm txheej ntawm atmospheric corrosion, muaj ZnO, Zn (OH) 2 thiab yooj yim zinc carbonate tiv thaiv zaj duab xis nyob rau saum npoo ntawm zinc txheej, uas mus rau ib qho twg slows tus corrosion ntawm zinc.Thaum cov yeeb yaj kiab tiv thaiv no (tseem hu ua xeb dawb) puas lawm, yuav tsim ib zaj duab xis tshiab.
Thaum cov zinc txheej raug mob hnyav thiab ua rau muaj kev phom sij rau cov hlau matrix, zinc yuav tsim cov tshuaj tiv thaiv electrochemical ntawm matrix, tus qauv peev xwm ntawm zinc yog -0.76V thiab tus qauv peev xwm ntawm hlau yog -0.44V.Thaum zinc thiab hlau tsim microbatteries, zinc yuav yaj raws li cov anode, thiab cov hlau yuav raug tiv thaiv raws li cathode.Obviously, atmospheric corrosion kuj ntawm kub dip galvanizing yog zoo dua li ntawm hluav taws xob galvanizing.
Post lub sij hawm: 20-04-23