1.Dab tsi tshwm sim thaum chromate passivation ntawm qhov kub thiab txias?
Dab tsi tshwm sim ntawm qhov kub thiab txias:
Thaum qhov kub siab tshaj 70 degree, cov dej ntawm crystallization nyob rau hauv cov yeeb yaj kiab passivation pib tawm, ua rau cov yeeb yaj kiab tawg.
Nrog rau qhov kub thiab txias ntxiv, cov yeeb yaj kiab tau dhau los ua qhov tsis tuaj yeem decomposition, poob nws txoj haujlwm tiv thaiv ntawm kev sib cais corrosive media.
Visually, zaj duab xis passivation yuav tig daj, xim av, los yog txawm dub (oxidation), poob nws thawj xim hlau luster.
Xaus: Tsis zoo cua sov; tsuas yog haum rau chav tsev kub ib puag ncig.
2.Qhov ntsuas kub ntawm chromium -dawb passivation yog dab tsi?
Qhov ntsuas kub tsis kam: Feem ntau ntawm 80℃thiab 120 degree, nyob ntawm cov qauv.
Silicate systems: Kub tsis kam, feem ntau tshaj 100 degree. Lawv cov yeeb yaj kiab muaj cov qauv sib txuas tsis sib xws, ua rau muaj qhov thermal stability.
Acrylic resin systems: Tsis zoo kub tsis kam, feem ntau tsis tshaj 80 degree. Qhov no yog vim hais tias cov organic resins soften thiab decompose nyob rau hauv high kub.
Titanium / zirconium systems: Nruab nrab kub tsis kam, feem ntau nyob ib ncig ntawm 90 degree.
Dab tsi tshwm sim ntawm qhov kub thiab txias:
Organic Cheebtsam volatilize los yog decompose, ua rau ntxeem tau thiab puas films.
Txawm hais tias cov khoom siv inorganic ruaj khov, qhov kev ncaj ncees ntawm cov yeeb yaj kiab raug cuam tshuam, txo qis kev tiv thaiv kev ua haujlwm.
Xaus: Thaum tshav kub kub ua haujlwm tau zoo dua qub, tab sis nws tseem tsis tuaj yeem tiv taus qhov kub siab ntev ntev.
3.Vim li cas cov txheej passivation tsis tiv taus qhov kub thiab txias?
Cov yam ntxwv sib xyaw: Txawm hais tias chromate los yog chromium-dawb passivation, txheej zaj duab xis muaj noo noo, organic teeb meem, lossis cov qauv crystalline tshwj xeeb. Cov kub kub tuaj yeem ua rau cov khoom no tsis ruaj khov.
Qhov sib txawv ntawm Thermal Expansion Coefficients nrog Zinc Layer: Cov zaj duab xis passivation thiab cov zinc txheej hauv qab yog ob yam sib txawv nrog cov coefficients sib txawv ntawm thermal expansion. Thaum qhov kub thiab txias hloov, lawv qhov nthuav dav thiab kev cog lus sib txawv, ua rau muaj kev ntxhov siab sab hauv hauv zaj duab xis passivation, uas tuaj yeem tawg thiab tev tawm.
Kev Ua Haujlwm Zoo ntawm Zinc Txheej: Kub kub ceev zinc oxidation. Thaum cov zaj duab xis passivation puas lawm, cov zinc sab hauv tau nrawm nrawm nrog cov pa oxygen los ua zinc oxide, poob nws cov khoom tiv thaiv -corrosion.
4.Dab tsi yog cov yam ntxwv thiab siab -kub tsis kam ntawm aluminized zinc coils?
Nta: Txhuas thiab silicon (piv txwv li, 55% Al-Zn) ntxiv rau zinc da dej.
Kub Kub Resistance: Far superior rau ntshiab zinc plating. Aluminium oxide tiv thaiv zaj duab xis tsim rau ntawm nws qhov chaw yog qhov ruaj khov heev, tso cai rau ntev - siv sijhawm ntev ntawm 315℃thiab luv -lub sijhawm tiv taus kub txog 650℃.
Cov ntawv thov: Qhov kev xaiv zoo tshaj plaws rau siab - qhov chaw kub.
5.Yuav ua li cas zoo galvanized aluminium-magnesium coils tiv taus kub?
Nta: Aluminium thiab magnesium ntxiv rau cov zinc molten.
Kub Kub Resistance: Zoo tshaj rau qhov zoo tib yam galvanizing, tab sis feem ntau tsis zoo li aluminized zinc plating. Cov kev ntsuas kub tshwj xeeb yuav tsum tau sab laj nrog cov chaw tsim khoom; Feem ntau nws tuaj yeem tiv taus qhov kub thiab txias ntawm 200 degree.
Daim ntaub ntawv: Zoo heev tag nrho corrosion kuj, ua rau nws xaiv zoo rau nruab nrab mus rau qhov kub thiab txias ib puag ncig.