1.Lub substrate kub li cas thaum lub sij hawm galvanizing cuam tshuam zinc txheej adhesion?
Lub hauv paus ntsiab lus tseem ceeb: Thaum cov hlua hlau nkag mus rau hauv zinc da dej, nws qhov kub thiab txias yuav tsum siab tshaj qhov kub ntawm zinc da dej (feem ntau ~ 460 degree).
Qhov zoo tshaj plaws: Lub substrate kub feem ntau tswj ntawm ib ncig ntawm 470-480 degree, me ntsis siab dua zinc da dej kub los ntawm 10-20 degree.
Yog tias qhov kub thiab txias qis dhau (substrate < zinc da dej):
Thaum cov hlau sawb hu rau zinc da dej, nws instantly absorbs tshav kub, ua rau zinc da dej sai sai solidify ntawm lub strip nto.
Qhov no cuam tshuam cov tshuaj tiv thaiv diffusion zoo ntawm cov hlau thiab txhuas, tiv thaiv kev tsim cov txheej txheem, txuas ntxiv Fe₂Al₅ inhibition txheej.
Qhov tshwm sim: zinc txheej adhesion txo qis heev, ua nkig thiab tuab, ua rau nws muaj kev cuam tshuam rau "zinc peeling" lossis "flaking" defects thaum ua tom ntej (xws li khoov thiab stamping).
If the temperature is too high (substrate >>zinc da dej):
Qhov no ua rau muaj zog cov tshuaj tiv thaiv ntawm hlau thiab zinc, ua rau kev loj hlob ntau dhau ntawm Fe-Zn alloy txheej (ib theem nkig).
Tsis tas li ntawd, kev tsim ntawm Fe-Al inhibition txheej yuav cuam tshuam.
Qhov tshwm sim: Cov zinc txheej ua npub thiab matte, nrog kev ua tsis zoo, uas tuaj yeem ua rau hmoov thiab tev.
2.Dab tsi yog kev sib raug zoo ntawm kub thiab adhesion tom qab alloying kev kho mob?
Tsis tshua muaj kub los yog luv luv lub sij hawm kho mob: Cov tshuaj tiv thaiv alloying tsis tiav, tawm hauv cov txheej txheem zinc ntshiab ntau dhau, ua rau tsis muaj adhesion thiab tsis zoo corrosion kuj.
Kub kub los yog ntev heev lub sij hawm kho mob: Lub Fe-Zn alloy txheej (feem ntau yog lub δ theem thiab ζ theem) yuav overgrow, tshwj xeeb tshaj yog lub brittle Γ theem (Fe₃Zn₁₀). Cov theem no yog nkig heev thiab yog thawj qhov ua rau tsis zoo adhesion.
Optimum Temperature Window: Muaj lub qhov rais nqaim pom zoo alloying kub. Nyob rau hauv lub qhov rais no, ib tug alloy txheej dominated los ntawm theem δ, nrog ib tug ntom qauv thiab muaj zog adhesion rau lub substrate, yuav tsim, ua kom pom adhesion.
3.Dab tsi yog vim li cas qhov kub thiab txias cuam tshuam rau adhesion?
Interfacial txheej txheej: Qhov ntsuas kub tsim nyog yog qhov tseem ceeb rau kev tsim kom muaj zog Fe-Al inhibition txheej (ntshiab zinc txheej) lossis zoo tagnrho Fe-Zn alloy txheej (alloyed txheej). Cov txheej txheem no ua haujlwm raws li "kev cog lus" ntawm cov zinc txheej thiab cov hlau substrate.
Kev ntxhov siab sab hauv: qhov kub tsis zoo tuaj yeem ua rau muaj kev ntxhov siab tseem ceeb hauv cov txheej txheem (piv txwv li, vim txias txias los yog tsim cov theem nkig). Thaum qhov kev ntxhov siab sab hauv no tshaj qhov sib txuas ntawm lub zog ntawm cov txheej thiab cov substrate, spalling tshwm sim.
4.Dab tsi tshwm sim yog tias qhov kub ntawm galvanizing (substrate kub) qis dhau lawm?
Tsis zoo adhesion, zinc txheej yooj yim peels tawm
5.Dab tsi tshwm sim yog tias qhov kub thiab txias qis dhau los yog lub sijhawm luv luv tom qab kev kho alloying?
Tsis txaus adhesion thiab tsis txaus alloying