Phosphating yog ib qho txheej txheem ua ntej siv los ua phosphate saum npoo ntawm cov hlau. Nws tuaj yeem siv rau cov hlau tsis muaj hlau (xws li txhuas, zinc, thiab lwm yam). Yam khoom.
Phosphating yog txheej txheem uas tsim cov phosphate hloov dua siab tshiab zaj duab xis los ntawm cov tshuaj lom neeg thiab cov tshuaj electrochemical, thiab cov phosphate conversion film hu ua phosphate film.
Lub hom phiaj tseem ceeb ntawm phosphating yog los tiv thaiv lub hauv paus hlau, tiv thaiv hlau corrosion mus rau ib qho twg, thiab tuaj yeem siv los ua primer ua ntej pleev xim los txhim kho qhov adhesion thiab corrosion kuj ntawm txheej txheej. Kev sib txhuam, lubrication nyhuv hauv kev ua haujlwm txias ntawm cov hlau.
Classification ntawm phosphates
⒈ Kev faib tawm los ntawm phosphating kub
⑴ Hom kub kub
Lub sijhawm kho ntawm 80-90 degree yog 10-20 feeb, thiab lub thickness ntawm phosphate zaj duab xis tsim yog 10-30g/m2. Qhov piv ntawm cov ntsiab lus ntawm cov kua qaub dawb rau tag nrho cov ntsiab lus ntawm cov kua qaub yog 1: (7-8).
Qhov zoo: Cov zaj duab xis muaj zog corrosion kuj thiab zoo adhesion.
Qhov tsis zoo: Lub sijhawm cua sov ntev, ntau qhov kev daws teeb meem volatilization, siv lub zog loj, phosphate nag lossis daus ntau, tsis ruaj tsis khov acidity, tsis sib xws siv lead ua tuab, tsis tshua siv.
⑵ Hom kub nruab nrab
50-75 degree , lub sij hawm kho 5-15 feeb, phosphating zaj duab xis thickness 1-7g/m2, tshuaj dawb acidity rau tag nrho acidity ratio 1: (10-15)
Qhov zoo: ruaj khov tsis muaj acidity, yooj yim los tswj, luv luv phosphating lub sij hawm, siab ntau lawm efficiency, corrosion kuj yog yeej ib yam li kub phosphating zaj duab xis, muaj ntau yam kev siv.
⑶ Hom kub qis
30-50 degree Zog txuag thiab siv tau yooj yim.
⑷ Hom kub li qub
{{0}} degree ib txwm kub (tsawg kub) phosphating (ntxiv rau ntxiv oxidizing tus neeg sawv cev, kuj ntxiv accelerator), lub sij hawm 10-40 feeb, tshuaj dawb acidity rau tag nrho acidity piv yog 1: ({ {3}}), zaj duab xis thickness yog 0.2 - 7g/m2.
Qhov zoo: Tsis muaj cua sov yuav tsum tau siv, tsis muaj tshuaj lom neeg, kev daws teeb meem ruaj khov.
Disadvantages: Lub sijhawm ua haujlwm ntev thiab kev npaj tshuaj nyuaj.
⒉ Kev faib tawm los ntawm kev sib xyaw ntawm cov tshuaj phosphating
⑴ Zinc phosphate
⑵ Zinc calcium phosphate
⑶ Hlau-raws li phosphating
⑷ Manganese phosphating
⑸ Complex phosphating Phosphating tov yog tsim los ntawm cov khoom xws li zinc, hlau, calcium, npib tsib xee, thiab manganese.
⒊ Kev faib tawm los ntawm txoj kev phosphating
⑴ Tshuaj phosphating
Lub workpiece yog immersed nyob rau hauv cov tshuaj phosphating thiab phosphating yog nqa tawm siv tshuaj tiv thaiv. Nws yog dav siv.
⑵ Electrochemical phosphating
Nyob rau hauv cov tshuaj phosphating, lub workpiece txuas nrog rau qhov zoo electrode thiab cov khoom siv hlau txuas nrog qhov tsis zoo electrode los ua phosphating.
⒋ Kev faib tawm los ntawm qhov zoo ntawm phosphate txheej
⑴ Thick (thick film phosphating) Cov yeeb yaj kiab hnyav yog 7.5g / m2 lossis ntau dua.
⑵ Semi-thick (nruab nrab-thick phosphating) Zaj duab xis hnyav yog 4.6-7.5g/m2.
⑶ Lub teeb (nyias zaj duab xis phosphating) Cov zaj duab xis hnyav yog 1.1-4.5g/m2.
⑷ Semi-lightweight (tshwj xeeb nyias zaj duab xis phosphating) Cov zaj duab xis hnyav yog 0 2-1 0g/m2.
⒌ Classification los ntawm tus txheej txheem
⑴Immersion phosphating
Haum rau siab, nruab nrab thiab qis kub phosphating. Nta: Cov cuab yeej siv yooj yim, tsuas yog lub tank cua sov thiab cov khoom siv cua sov uas yuav tsum tau ua. Nws yog qhov zoo tshaj plaws los siv lub tank stainless hlau lossis roj hmab-lined tank. Sab ntawm lub tank.
⑵ Txau phosphating
txheej txheem thov
1. Pre-degreasing → Degreasing → xeb tshem tawm → dej ntxuav → (kev kho saum npoo av) → Phosphating → dej ntxuav → Kev kho tom qab phosphating (electrophoresis, hmoov txheej, thiab lwm yam).
2. Cov khoom tseem ceeb ntawm txhuas thiab zinc
3. Phosphate blackening tov
Thaum siv nyob rau hauv chav tsev kub, phosphating tiv thaiv, tseem hu ua steel coloring agent, yog tsim nyob rau hauv ib kauj ruam. Dilute 1:4-5 ua ntej siv, tsau ntawm chav tsev kub li 30 feeb, thiab thaum kawg foob rau kev tiv thaiv.
4. Kev kho cov txheej txheem: tshem tawm cov roj thiab xeb - immersion hauv dej los tiv thaiv xeb - Phosphating thiab blackening - ziab - sealing tiv thaiv [1].
Nruab nrab-tsawg kub phosphating tuaj yeem siv los kho cov chaw ua haujlwm loj xws li tsheb, tub yees, thiab lub tshuab ntxhua khaub ncaws. Nta: Lub sijhawm ua haujlwm luv luv, kev tsim cov yeeb yaj kiab ceev ceev, kev ua haujlwm siab ntau lawm, thiab cov phosphate zaj duab xis tau los ntawm txoj kev no yog ntom thiab zoo li crystallization, nyias zaj duab xis nrog zoo corrosion kuj.