55. Yuav ua li cas zinc adhere rau hlau?

Kev tsim cov zinc txheej ntawm cov kav hlau yog tshwm sim los ntawm kev sib txuam ntawm lub cev thiab tshuaj lom neeg ntawm cov yeeb nkab thiab cov zinc molten. Cov kua zinc tuaj yeem corrode thiab yaj feem ntau cov hlau tsis hais lawv cov ntsiab lus melting. Ua kom qhuav kub-dip galvanizing ua piv txwv: Cov kav hlau uas muaj zinc chloride tov yog thawj zaug rhuab mus rau 200-250℃hauv qhov cub kom qhuav, ces muab tso rau hauv zinc molten ntawm 480-500℃. Tam sim ntawd, cov kav dej nqus cov cua kub loj, ua rau cov kua zinc ntawm lawv qhov chaw kom txias sai thiab khov rau hauv lub plhaub tiv thaiv. Raws li cov khoom siv hluav taws xob tas mus li melts lub plhaub no, cov zinc txheej tsim thaum cov yeeb nkab qhov kub thiab txias sib npaug nrog cov zinc molten kub. Cov txheej txheem muaj xws li: 1) Cov hlau nplaum uas ua rau hauv zinc; 2) Hlau thiab zinc combining los tsim ib txheej hlau-zinc alloy; 3) Ib txheej zinc ntshiab ua rau ntawm cov hlau sab nrauv, uas crystallizes thaum txias; 4) Zinc txheej bonding nrog steel substrate. Qhov tseem ceeb, kub-dip galvanizing tsim cov zinc txheej los ntawm cov txheej txheem diffusion.