1.What yog cov txheej txheem sib xws rau degreasing (soecing)?
Cov hau kev:
Alkali degreasing: ras cov steel nyob rau hauv ib qho kev daws teeb meem alkaline (xws li sib tov ntawm sodium carbonate, ntawm 60- 80}} 80} 80} 80 Qhov no tshem cov roj los ntawm cov tshuaj tiv thaiv saponification ntawm alkali thiab roj (cov roj (cov roj ua cov xab npum dej thiab glycerin). Hom no yog tsim nyog rau kev ua tiav.
Hnyav degreasing: Yog tias cov roj muaj hnyav lossis muaj ib hom ntxhia (xws li roj av lossis dej cawv) kom yaj tau cov roj ua ntej ua kom muaj kev ntxuav ua ntej.
2.Qhov dab tsi yog cov kev sib xws rau pickling (xeb / teev tshem tawm)?
Hydrochloric acid pickling: feem ntau siv cov qauv cuam tshuam nrog immersing cov hlau hauv ib 15% {10%}}}}}}} Lub roj hydrochloric acid reacts nrog nplai thiab xeb (piv txwv li} hcl {} h₂o} h₂o), yaj yeej. Hydrochloric acid pickling yog ceev thiab tsawg dua corrosive rau cov steel substrate (tab sis lub sijhawm pickling yuav tsum tau tswj kom tsis txhob muaj kev sib tw).
Sulfuric acid pickling: yog hydrochloric acid yog kim dua, ib 10% -15% sulfuric acid tov (kub 60-80 degree) tuaj yeem siv. Txawm li cas los xij, sulfuric acid reacts ntau qeeb dua thiab tuaj yeem yooj yim rau "hydrogen embrittlement" ntawm cov hlau deg (xws li methenamine). Yog li ntawd, nws yog tam sim no feem ntau siv ntau dua li hydrochloric acid.
3.Qhov twg yog cov txheej txheem feem ntau rau kev pab plating (ua kom lub npoo thiab txhawb zinc horning)?
Ua ntej, siv cov hlau hauv lub taub dej ntawm cov dej huv los yaug txhua qhov realfual. Tom qab ntawd, tshem nws nyob rau hauv flux daws (feem ntau yog qhov sib xyaw ntawm zinc chloride, 10% -20% hauv dej, ntawm 60-3 feeb ua ntej tshem nws.
Flux daws cov yeeb yaj kiab nyias nyias ntawm zinc - ammonium complex rau ntawm cov pa da dej
4.Qhov dab tsi yog cov kauj ruam rau kev ziab thiab muab tso rau hauv hnab khuam dig?
Kom qhuav: cov hlau nto tom qab ua plating flux muaj noo noo los ntawm cov tshuaj flux thiab yuav tsum tau qhuav hauv lub cub tawg (100 {} 12} 120 degree). Yog tias noo noo nkag mus rau cov lauj kaub zinc, nws yuav pom tam sim ntawd thaum muaj kev phom sij kub, ua rau muaj kev phom sij
Nkag mus rau lub lauj kaub zinc qhuav: lub yas qhuav yog maj mam raus rau hauv Mollten zinc daws. Cov zinc kub yuav tsum nruj me ntsis tswj nruab nrab ntawm 445-460℃(Zinc's Degree) yog kwv yees li ntawm 419 degree, uas tso cai rau cov tshuaj tiv thaiv zoo thiab muaj cov tshuaj tiv thaiv zoo). Thaum lub sij hawm immersion, xyuas kom cov hlau yog kiag li submerged nyob rau hauv lub zinc tov thiab tsis txhob muaj kev sib cuag nrog hauv qab zinc (los tiv thaiv cov khoom ntawm cov impurities).
5.Txhob tswj zinc tshem sijhawm thiab kub?
Galvanizing sijhawm: Qhov no yuav tsum tau hloov kho raws li cov tuab ntawm cov hlau. Cov khoom nyias nyias (xws li xaim thiab cov hlau) yuav tsum tau 1-3 feeb ntawm galvanizing (cov tshuaj tiv thaiv sai sai tuaj yeem ua rau cov txheej tuab tuab dhau thiab siv lub ntsej muag). Cov khoom tuab (xws li cov kav dej thiab cov hlau ntu) yuav tsum tau 3-10 feeb ntawm galvanizing kom ntseeg tau tias zinc daws cov ces ua thiab tsis txhob xau.
Qhov mob kub: Yog tias qhov ntsuas kub tsawg dhau (<440°C), the zinc solution will have poor fluidity, and the coating will be prone to "sagging" (localized accumulation). If the temperature is too high (>470 degree), cov hlau thiab zinc kub dhau sai heev, ua rau cov txheej tuab tuab tuab