1. Xaj lub cev qoj ib ce, cov hlau txheem galvanized muab kev tiv thaiv li cas?
Ntive Oxide Zaj Duab Xis
Thaum Zinc muaj tshwm sim rau huab cua, nws sai tsim nrawm zinc carbonate, sib sau ua ib tug ntom, dej-insoluble passivation zaj duab xis.
Zaj duab xis no thaiv cov dej vapor thiab oxygen los ntawm kev hu rau lub hauv paus ntawm cov hlau, zoo ib yam li cov txheej txheem Aluminium Oxide ntawm txhuas.
Kev ncaj ncees ntawm zinc plow ◦ Qhov nruab nrab thickness ntawm kub-dip galvanized txheej yog ntau dua los yog sib npaug nrog kev sib txuas ntawm cov kab mob corrosive.
2. Cov tshuaj tiv thaiv tshuaj ntawm zinc txheej manifest nws tus kheej?
Kev coj kom zoo ntawm lub hauv paus ntsiab lus
Muaj peev xwm sib txawv tsav: Tus qauv hluav taws xob hluav taws xob muaj peev xwm ntawm Zinc yog qhov tsis zoo ntau dua li ntawm cov hlau. Thaum txheej txheej puas lawm thiab lub substrate yog nthuav tawm:
Zinc → Solfedly Corroded Anode
Hlau → Profected Cathode
Electron Flow: Cov Zinc Txheej Khiav Tawm Hluav Taws Xob Cov Hluav Taws Xob, uas ntws los ntawm cov hlau substrate mus rau cov hlau loj, inhibiting cov tshuaj oxidation ntawm cov hlau.
Kev kho tus kheej ntawm cov khoom corrosion: Zn ions tau tsim los ntawm qhov chaw puas thiab ua ke nrog cov khoom siv zawv zawv zawg.
3.Qhov yog cov ciaj ciam tsis tiav thiab cov kev txwv?
Loj loj kev puas tsuaj: thaum lub kos dav yog loj dua 4 hli, electrochemical kev tiv thaiv ntau yog tsis muaj kev tiv thaiv (kev tiv thaiv voj voog ≈ 2mm).
Kev kub siab ua hauj lwm: Thaum cov zinc / hlau muaj peev xwm sib txawv yog ntau dua 60 degree, qhov kev tiv thaiv kev tiv thaiv kab mob tsis muaj zog; Thaum lub zinc txheej loj dua 200 degree, oxidation thiab tev ntawm zinc txheej tshwm sim.
Hu rau ntawm cov feem tsis sib xws: Saib xyuas ncaj qha nrog tus tooj liab thiab stainless hlau yuav ua rau nrawm galvanic corrosion.
4.Qhov tseeb yog qhov tseem ceeb ntawm engineering?
Kev Kho Mob: Kho nrog cov khaub thuas-txau zinc pleev xim nrog zinc cov ntsiab lus> 96% (xws li ZRC, CRC hom). Kev Tiv Thaiv Kev Txuas: Thov txheej txheej Dacromet (Zinc-chromium zaj duab xis) ntawm lub ntsia liaj qhov rooj tiv thaiv kom tsis txhob muaj kev sib tiv thaiv kev ua kom tsis txhob muaj cov corrosion.
Cov txheej txheem huab: siv zinc-aluminium txheej (zam) hauv cov chaw cog khoom marine lossis tshuaj cog qoob loo tiv thaiv los ntawm 3 txog 5 zaug.
5.Qhov yog ib qho kev hloov kho ib puag ncig kev hloov kho ntawm cov hlau galvanized?
PH tsis muaj peev xwm
Zinc yog ruaj khov nyob rau hauv lub Ph Thaj Tsam Ntawm 6 ~ 12, thiab tus xeb tus nqi tsawg dua lossis sib npaug ntawm 0.1μm / xyoo (zoo tshaj plaws hauv nruab nrab ntawm nruab nrab).
Acidic Ib puag ncig (Ph<6): Zn + 2H⁺ → Zn²⁺ + H₂↑ (corrosion acceleration)
Alkaline environment (pH>12): Zn {+ 2 Oh Oh ug Zno₂²⁻ + H₂↑ (Deatolution nrawm)
Ntsev Txau Kuj Siv Hluav Taws Xob
Thaum Corroded, lub zinc corrosion khoom zn₅ (Oh) ₈cll₂ ₈cl₂ ₈cl₂ ₈clement agipitation (electrogalvanizing tsis muaj lub peev xwm no).