Cov txheej txheem kub-dip galvanizing muaj peb kauj ruam: kev npaj nto, galvanizing, thiab tshuaj xyuas.
Kev npaj nto:Rau qhov zoo kub-dip galvanizing, hlau yuav tsum tau npaj kom zoo ua ntej muab tso rau hauv ib da dej ntawm molten zinc. Thaum lub sij hawm npaj nto, cov khoom siv los ntawm degreasing / caustic tu, pickling, thiab fluxing.
Degreasing / Caustic Cleaning: Cov kua dej kub alkali, me ntsis acidic da dej, los yog cov tshuaj ntxuav lub cev tshem tawm cov kab mob ntawm cov hlau xws li av, roj thiab roj.
Pickling: Txhawm rau tshem tawm cov nplai zeb thiab cov hlau oxides, cov hlau mus los ntawm cov tshuaj diluted ntawm rhuab sulfuric acid lossis ambient hydrochloric acid.
Fluxing: Los ntawm cov txheej txheem saum npoo av kawg, cov oxides uas tseem tshuav raug tshem tawm hauv cov tshuaj zinc ammonium chloride thiab cov txheej tiv thaiv tau muab tso rau ntawm cov hlau kom tsis txhob muaj cov oxides ntxiv los ntawm kev tsim ua ntej galvanizing.
Galvanizing:Tom qab kev npaj nto, cov hlau yuav muab tso rau hauv ib da dej ntawm zinc molten. Zinc kettle muaj tsawg kawg yog 98 feem pua ntawm zinc ntshiab thiab khaws cia ntawm qhov kub ntawm 815º-850º F (435º-455º C). Thaum cov hlau yog raus rau hauv lub hwj, zinc reacts nrog cov hlau nyob rau hauv cov hlau los tsim ib tug series ntawm metallurgically bonded zinc-hlau alloy txheej nrog cov txheej saum toj kawg nkaus 100 feem pua zinc.
Kev tshuaj xyuas:Cov txheej txheem tshuaj xyuas ntawm galvanized steel yog yooj yim haum. Zinc yuav tsis hnov mob nrog cov hlau tsis huv, yog li kev soj ntsuam pom ntawm cov khoom yuav muab kev ntsuam xyuas zoo ntawm cov txheej txheem zoo. Kev sim rau txheej tuab thiab ua raws li ASTM cov qauv yuav raug ua.
