Cov ntsia hlau feem ntau siv cov txheej txheem kho saum npoo yogoxidation, electrophoresis, electroplating, Dacromet plaub pawg, cov hauv qab no feem ntau yog ntsia hlau rauxim ntawm kev kho saum npoo ntawm cov ntsiab lus kev faib tawm.
- Dub oxide:
Muab faib rau hauv chav sov blackening thiab kub kub blackening, mus rau chav kub blackening raws li ib qho piv txwv ntawm cov txheej txheem yog: tshuaj degreasing - dej kub ntxuav - dej txias - tshem tawm xeb thiab acid etching - tu - blackening - tu -Over roj los yog tshaj kaw. Nws yog ib txheej ntawm oxide zaj duab xis tsim los ntawm sodium hydroxide thiab sodium nitrite ntawm qhov kub siab tshaj 100 degrees.
Lub ntsiab ntawm cov oxide zaj duab xis yog hlau tetraoxide (Fe3C4), cov yeeb yaj kiab tsis sib xws tsuas yog 0.6-1.5um, kev tiv thaiv corrosion kuj tsis zoo, nyob rau hauv cov ntaub ntawv tsis dhau cov roj los yog kaw nruab nrab ntsev tsuag tsuas yog 1-2 teev los yog li ntawd, tshaj cov roj hauv 3-4 teev los yog li ntawd. Cov khoom siv me me tsis siv cov txheej txheem no rau lub sijhawm ua cov ntsia hlau. Qhov txawv ntawm cov xim, dub oxide thiab dub zinc thiab electrophoretic dub kaw, tab sis tsis zoo li dub zinc thiab electrophoretic dub xim.
- Galvanize:
Dub electroplating muaj ob hom dub zinc thiab dub npib tsib xee, lub hauv paus ntsiab lus ntawm cov txheej txheem yog tib yam, tsuas yog cov formulation ntawm electroplating tov thiab tom qab kho nrog txawv lattice los yog passivation tov. Zinc yog tshuaj lom neeg, yooj yim rau oxidise thiab darken nyob rau hauv cov huab cua, thiab thaum kawg tsim 'dawb xeb' corrosion, zinc plating tom qab kev kho mob chromate thiaj li yuav npog ib txheej zinc ntawm cov tshuaj hloov dua siab tshiab zaj duab xis, thiaj li hais tias cov active hlau nyob rau hauv ib tug passive lub xeev, yog lub passivation ntawm zinc txheej. Passivation zaj duab xis los ntawm cov tsos tuaj yeem muab faib ua dawb passivation (dawb zinc), lub teeb xiav (xiav zinc), dub passivation (dub zinc), tub rog ntsuab passivation (ntsuab zinc) thiab lwm yam.
- Electrophoresis Dub:
Kev siv cov txheej txheem electrochemical los tso cov khoom siv colloidal ntawm cov organic resin rau ntawm qhov chaw los tsim cov txheej txheem organic ntawm ntau yam xim, electrophoresis dub yog siv ntau dua hauv kev lag luam, coj cov txheej txheem dub ua piv txwv: degreasing-cleaning-phosphating-electrophoresis xim-kom qhuav. Nws tuaj yeem muab faib ua anodic electrophoresis (resin ionisation rau hauv qhov tsis zoo ions) thiab cathodic electrophoresis (cov resin electrophoresis rau hauv cov ions zoo), thiab cov txheej txheem xim piv rau kev tsim kho kev ua tau zoo, muaj kuab paug thiab kev puas tsuaj rau ib puag ncig kom txo nws cov tsis kam rau nruab nrab ntsev tsuag kev ua haujlwm hauv 300 teev lossis ntau dua, tus nqi thiab corrosion kuj thiab Dacromet txheej txheem zoo ib yam.
- Zinc dawb:
Electroplating txheej txheem yog: degreasing - tu - qaug zog acid ua kom - electroplating zinc - tu - dawb passivation plaub hau - ntxuav - ziab, thiab dub zinc txawv yog tsis dhau lat khib thiab passivation tov sib txawv, dawb passivation yog xim tsis muaj pob tshab zinc oxide zaj duab xis, yuav luag tsis muaj chromium, yog li cov corrosion kuj txheeb ze rau dub zinc, xiav zinc yog 6 xuab moos, muaj xim tsis zoo. plating chaw tsim tshuaj paus los ntawm kev txhim kho qhov tseeb ntawm qhov sib piv ntawm cov tshuaj passivation tuaj yeem ua kom tiv thaiv cov tshuaj tsw qab ntsev rau li 20 teev.
Vim tias dawb zinc plating hom txheej txheem txheej txheem ntsia hlau los ua qhov nruab nrab ntsev tsuag tshuaj ntsuam thawj zaug tshwm sim ntawm lub plating corrosion dawb, liab xeb tshwm sim nyob rau hauv li 40 teev, yog li dawb zinc corrosion kuj zoo dua li dawb npib tsib xee. Qhov tsos thiab dawb npib tsib xee piv rau qhov tsaus ntuj, dawb zinc rau thawj xim ntawm zinc ntsuab-dawb, thiab dawb nickel piv rau qhov sib txawv ntau dua.
- Dawb Nickel:
Cov txheej txheem plating yog: degreasing - tu - tsis muaj zog acid activation - tu - tooj liab hauv qab - ua kom - ntxuav - electroplating npib tsib xee - ntxuav - passivation - ntxuav - ziab - los yog kaw, thiab dub nickel txheej txheem yeej ib txwm, feem ntau plating tov mis yog sib txawv, tsawg zinc sulfide thiab koom.Nickel yog ib tug silver-dawb xim daj-daj, zoo dua cov hlau. Nws cov corrosion kuj thiab dub npib tsib xee tsis sib txawv ntau 6-12 teev, cov txheej txheem ntawm cov tuam txhab lag luam tseem yuav dhau cov roj los yog kaw, xws li xav txog qhov cuam tshuam ntawm corrosion ntawm cov khoom yas ntawm cov khoom tuaj yuav tsum tau siv los ua kev tsom mus rau kev tswj xyuas seb puas muaj roj.
- Xiav zinc, ntsuab zinc:
Cov txheej txheem yog roughly tib yam li dawb zinc, xiav zinc yog passivated zinc oxide zaj duab xis muaj 0.5-0.6mg / dm2 ntawm trivalent chromium. Green passivation, tseem hu ua tsib-acid passivation, tuaj yeem tau txais cov yeeb yaj kiab tuab-ntsuab ntsuab, cov tshuaj passivation muaj phosphate ions, qhov tshwm sim glossy nyom-ntsuab zaj duab xis yog ib qho nyuaj, kev tiv thaiv zaj duab xis ntawm chromates thiab phosphates.
Rau nws cov corrosion kuj, xiav zinc zoo dua li zinc dawb, thaum ntsuab zinc zoo dua xiav zinc. Cov xim ntawm xiav zinc yog me ntsis xiav thiab dawb zinc yog nyob ze rau kev lag luam siv ntau dua, tom kawg kuj tuaj yeem siv los ua cov khoom tsim thaum lwm txoj hauv kev ntawm screws.
- Enameled zinc (chemistry):
Nyob rau hauv pawg galvanizing ntawm cov txheej txheem ntawm cov xim zinc kuj zoo corrosion kuj, nws cov xim passivation txheej txheem yog: galvanizing - tu - 2% - 3% nitric acid tawm ntawm lub teeb - tu - tsis tshua muaj chromium xim passivation - tu - ci aging. Passivation kub yog tsawg heev, zaj duab xis yog qeeb, daj ntseg zaj duab xis nyias. Kub kub, zaj duab xis yog tuab thiab xoob, tsis ruaj khov. Nws yog qhov zoo tshaj plaws los tswj ntawm li 25 degrees kom ntseeg tau tias cov xim tib yam tau txais nyob rau hauv ib lub sijhawm.
Tom qab passivation, nws yuav tsum tau ci thiab hnub nyoog los txhim kho cov adhesion thiab corrosion kuj ntawm zaj duab xis. Xim zinc-plated screws los ntawm kov hauv qab ntawm kev tiv thaiv rau nruab nrab ntsev tsuag hauv ntau tshaj 48 teev, kev tswj zoo tuaj yeem ua tiav ntau tshaj 100 teev.
- Dacromet:
Nws yog cov ntawv luv thiab txhais lus ntawm DACROMET, piv txwv li flaky zinc-based chromium ntsev tiv thaiv txheej, kuj hu ua zinc-aluminium txheej. Cov txheej txheem yooj yim yog: degreasing - degreasing - txheej - preheating - sintering - txias. Cov txheej txheem feem ntau yuav muaj 2-4 zaug los ntawm txheej txheej rau cov txheej txheem txias, vim tias cov ntsia hlau nrog cov txheej txheej xws li kom ua tiav cov thickness yuav tsum tau ua ntau zaus.
Cov qauv yog nyob rau ntawm cov hlau nto, coated nrog ib txheej ntawm Dacromet tov (xws li, muaj scale zinc, txhuas [teev feem ntau loj 0.1-0.2X10-15 microns] Cr03 thiab tshwj xeeb organic teeb meem ntawm heev dispersible tov aqueous tov), los ntawm 300 ° C los yog kom sov preservation ci ib tug tej lub sij hawm ntawm cov kua nyob rau hauv lub chromium. chromium, ua rau amorphous composite chromate compounds (nCr03) mCr203).
Corrosion kuj zoo heev nruab nrab ntsev mus txog 300 teev los yog ntau tshaj, qhov tsis zoo ntawm txheej yog tsis zoo li, nyias txoj hauj lwm ntawm 5-10um, tuab txoj hauj lwm ntawm 40um los yog li ntawd, nws yuav cuam tshuam rau qhov tob ntawm lub taub hau screws, yog li lub tshuab tapping screws thiab screws nrog ib tug me me txoj kab uas hla ntawm lub screws yog zoo heev tsis txhob siv Dacromet txheej txheem raws li kev kho mob nto.
Lub sij hawm xa tuaj: Sep-18-2024
