Cov ntsia hlau yog me me hauv cov khoom siv hluav taws xob thiab yooj yim saib xyuas. Ntxiv nrog rau cov lus qhia tshwj xeeb, lub ntsiab lus tseem ceeb thaum xaiv cov ntsia hlau yog cov xim zoo nkauj thiab corrosion kuj. Cov ntsia hlau siv hauv cov khoom siv hauv tsev me me niaj hnub no muaj kev tiv thaiv corrosion ntau dua li cov khoom qub AV vim qhov kev siv sib txawv. Los ntawm kev mus ntsib tsis ntev los no rau qee lub chaw tsim hluav taws xob electroplating, peb tau sau cov qauv ntsia hlau ntawm ntau yam txheej txheem, txheej txheej sib txawv lossis txheej txheej thicknesses, thiab sib txawv specifications los ua ib qho kev sib piv ntawm cov ntsev ntsev hauv qab thiab cov ntsiab lus, vam tias yuav muaj kev nkag siab zoo ntawm kev tsim induction. cookers, soybean milk machines, thiab kettles. Cia peb ua qee qhov kev siv rau kev xaiv cov ntsia hlau siv hauv cov khoom siv me me.
Feem ntau siv cov txheej txheem kho saum npoo rau cov ntsia hlau suav nrog oxidation, electrophoresis, electroplating, thiab Dacromet. Cov hauv qab no feem ntau yog muab faib ua ke thiab cov ntsiab lus raws li cov xim ntawm kev kho deg ntawm screws.
【1】 Dub plated screws
Cov ntsia hlau dub feem ntau yog siv los kho cov ntaub ntawv hauv qab lossis cov ntaub ntawv rov qab ntawm cov xim dub lossis lwm yam khoom siv hluav taws xob tsaus nti. Txhawm rau txo qis kev tswj cov khoom, feem ntau cov ntsia hlau dub kuj tau siv hauv lub tshuab. Nws feem ntau suav nrog ntau cov txheej txheem xws li oxide dub, npib tsib xee dub, zinc dub thiab electrophoretic dub.
1. Oxidized dub:
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Nws tau muab faib ua ib txwm kub blackening thiab kub kub blackening. Ua ib qho piv txwv kub kub blackening ua piv txwv, cov txheej txheem ntws yog: tshuaj degreasing-kub dej ntxuav-txias dej ntxuav-xeb tshem tawm thiab acid etching-cleaning-blackening-cleaning-over-oiling lossis over-sealing. Nws yog oxide zaj duab xis tsim los ntawm sodium hydroxide thiab sodium nitrite ntawm qhov kub siab tshaj 100 degrees.
Cov khoom tseem ceeb ntawm oxide zaj duab xis yog ferric oxide (Fe3C4). Qhov sib xws ntawm zaj duab xis tsuas yog 0.6-1.5um. Qhov kev tiv thaiv corrosion kuj tsis zoo. Qhov nruab nrab ntsev tsuag tsuas yog kav li ntawm 1-2 teev yam tsis muaj roj los yog sealing. Nws yuav siv li ntawm 3-4 teev tom qab oiling. Tam sim no tsis muaj cov ntsia hlau siv cov txheej txheem no rau cov khoom siv hauv tsev me. Nyob rau hauv cov nqe lus ntawm tsos xim, oxide dub yog ze rau dub zinc thiab electrophoretic dub, tab sis tsis zoo li dub zinc thiab electrophoretic dub.
2. Electroplating:
Muaj ob hom dub electroplating: dub zinc thiab dub nickel. Cov txheej txheem txheej txheem yog tib yam, tab sis cov qauv ntawm cov tshuaj electroplating thiab cov ladle lossis passivation tov siv rau kev ua haujlwm tom qab sib txawv. Zinc muaj cov khoom siv tshuaj lom neeg thiab yooj yim oxidized thiab darkened nyob rau hauv cov huab cua, nws thiaj li ua "dawb xeb" corrosion. Tom qab galvanizing, nws raug kho nrog chromate los npog cov zinc nrog cov tshuaj hloov pauv zaj duab xis kom cov hlau ua haujlwm nyob rau hauv lub xeev passive. Nws yog kev kho mob passivation ntawm zinc txheej. Los ntawm cov tsos, cov zaj duab xis passivation yuav 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.
2.1 Dub zinc plating:
Daim duab electroplating txheej txheem yog: degreasing - tu - qaug zog acid etching - electro-galvanizing - tu - passivation - tu - ziab - racking; qhov kawg khib yog tsuas yog ua los ntawm cov roj dub (ib hom xim), tinna dej, thiab roj hmab Dej yog tov raws li ib qho piv txwv. Nws lub luag haujlwm tseem ceeb yog txhawm rau txhim kho cov xim dub uniformity thiab ci ntsa iab ntawm cov ntsia hlau nto thiab txhim kho corrosion kuj ntawm cov ntsia hlau. Tom qab dhau los ntawm lub thav duab, qhov nruab nrab ntsev tsuag tsis kam yog siab tshaj 20. Yog tias nws tuaj yeem tiv taus roj, Corrosion muaj peev xwm kuj tuaj yeem txhim kho.
Qhov nruab nrab ntsev tshuaj tsuag rau dub zinc ntsia hlau kav ntev li 12 teev. Kev lag luam qib kuj yog siab heev, thiab tsis muaj qhov ua tsis tiav tau tshwm sim hauv cov kev sim niaj hnub. Judging los ntawm cov tsos, nws yog tsaus dua dub nickel thiab ze rau oxide dub thiab electrophoretic dub. Txoj kev sib txawv yog rub ob peb zaug ntawm daim ntawv dawb kom pom cov xim dawb ntawm zinc.
2.2 Dub npib tsib xee plating:
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Cov txheej txheem electroplating yog: degreasing-cleaning-tsis muaj zog acid activation-tu-tooj liab plating-ua kom-tsim-dub npib tsib xee plating-tu-passivation-cleaning-drying-dhau khib, cov xim dub plated los ntawm cov xim dub npib tsib xee plating cov nickel txheej feem ntau muaj 40%-60% nickel, 20%-30% zinc, 10%-15% sulfur, thiab txog 10% organic teeb meem.
Thaum lub sij hawm electroplating txheej txheem, cov sulfur nyob rau hauv thiocyanate ions yog hloov dua siab tshiab rau hauv sulfide ions, thiab ua ke nrog npib tsib xee los ua dub nickel sulfide. Lub luag haujlwm tseem ceeb ntawm kev ntxiv cov tooj liab plated hauv cov txheej txheem yog ua kom yooj yim rau cov phaj npib tsib xee hauv cov txheej txheem tom qab ua tiav thiab txhim kho corrosion kuj ntawm cov ntsia hlau. Feem ntau, lub thickness ntawm tooj liab puag yog li 1 micron. Ua kom lub thickness ntawm tooj liab tuaj yeem txhim kho corrosion kuj, tab sis cov khoom xyaw yuav nce raws li.
Tom qab ua qhov kev sim ua ntej ntawm cov ntsia hlau siv los ntawm ntau lub tuam txhab electroplating, kev lag luam-theem tsis kam rau cov tshuaj ntsev nruab nrab feem ntau yog 6-12 teev. Yog tias qhov kev faib ua feem raug thiab cov khoom siv raw zoo ntawm ntau yam khoom siv hauv electroplating tau txhim kho, nws tuaj yeem txhim kho. Nyob rau hauv cov txheej txheem npib tsib xee plating, cov tuam txhab electroplating dav siv yuav roj lossis foob txhawm rau txhawm rau txhim kho corrosion. Xav txog qhov cuam tshuam corrosion ntawm cov khoom yas, cov ntsia hlau siv tsis tuaj yeem raug oiled los ua kom cov ntsev tsuag lub sij hawm. Qhov nruab nrab ntsev tsuag lub sij hawm sim yog 8 teev. Nws tsis ruaj khov nyob rau hauv kev sim niaj hnub, thiab ntau pawg ntawm cov tshuaj tsw qab ntsev tsis tu ncua ua tsis tau.
Nws yog ib qho yooj yim kom paub qhov txawv ntawm cov tsos vim hais tias dub nickel yog tsaus dua li lwm cov zinc dub, oxide dub thiab electrophoretic dub.
1. Electrophoresis dub:
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Lub colloidal hais ntawm cov organic resin yog tso rau ntawm qhov chaw uas siv cov txheej txheem electrochemical los tsim cov organic txheej txheej ntawm ntau yam xim. Electrophoretic dub feem ntau yog siv hauv kev lag luam. Siv cov txheej txheem dub ua piv txwv: degreasing - tu - phosphating - electrophoretic xim - ziab. Nws tuaj yeem muab faib ua anodic electrophoresis (cov resin ua tsis zoo ions tom qab ionization) thiab cathodic electrophoresis (cov resin ua zoo ions tom qab electrophoresis). Piv nrog rau cov txheej txheem xim, kev tsim kho kev ua haujlwm zoo dua, thiab cov pa phem thiab kev puas tsuaj rau ib puag ncig raug txo. Nws qhov nruab nrab ntsev tsuag kuj yog 300 teev. los yog saum toj no, tus nqi thiab corrosion kuj zoo ib yam li cov txheej txheem Dacromet.
【2】 Dawb plated screws
Kuj tseem muaj ntau cov xim dawb-coated screws uas raug nthuav tawm, feem ntau suav nrog cov npib tsib xee dawb, zinc dawb thiab stainless hlau screws yam tsis muaj kev kho deg.
1. Dawb zinc:
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Cov txheej txheem electroplating yog: degreasing - tu - qaug zog acid ua kom - zinc electroplating - tu - dawb passivation - tu - ziab. Qhov txawv ntawm cov zinc dub yog tias tsis muaj qhov sib txawv ntawm cov kua passivation thiab passivation kua. Dawb passivation yog hom tsis muaj xim thiab pob tshab zinc oxide zaj duab xis muaj yuav luag tsis muaj chromium, yog li qhov corrosion kuj yog qhov phem dua li cov zinc dub, xiav zinc thiab xim zinc. Tus qauv kev lag luam yog 6-12 teev. Qee cov tuam txhab electroplating tau txhim kho kev npaj cov tshuaj passivation. Qhov tseeb tshwj xeeb tuaj yeem tiv taus nruab nrab ntsev tsuag rau li 20 teev.
Vim tias qhov nruab nrab ntsev tsuag tshuaj ntsuam xyuas ntawm cov ntsia hlau coated nrog dawb zinc saum npoo kho tshuab pib pom tias cov txheej txheej saum npoo tau corroded thiab tig dawb, thiab xeb liab tshwm sim tom qab li 40 teev, yog li qhov corrosion kuj ntawm cov zinc dawb yog zoo dua li cov dawb nickel. . Cov tsos yog tsaus dua li cov xim dawb nickel. Thawj xim ntawm zinc yog xiav dawb, uas txawv heev ntawm cov xim dawb nickel.
2. Dawb npib tsib xee:
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Cov txheej txheem electroplating yog: degreasing - tu - qaug zog acid activation - tu - tooj liab plating - ua kom - ntxuav - npib tsib xee plating - tu - passivation - tu - ziab - los yog sealing. Nws yog qhov pib zoo ib yam li cov txheej txheem nickel dub, feem ntau yog cov tshuaj electroplating. Cov mis yog txawv, zinc sulfide ploj lawm thiab ntxiv.
Nickel yog silvery dawb thiab me ntsis daj hlau. Txhawm rau kom tau txais qhov pom zoo dua, ntxiv cov nickel plating brightener. Nws cov corrosion kuj tsis txawv ntau ntawm cov xim dub nickel. 6-12 teev. Feem ntau, cov tuam txhab lag luam tseem yuav tshaj roj lossis foob thaum lub sijhawm ua haujlwm. Piv txwv li, xav txog qhov cuam tshuam ntawm corrosion ntawm cov khoom yas, cov khoom siv yuav tsum tau tsom rau kev tswj xyuas seb lawv puas muaj roj ntau dhau.
3. Stainless hlau screws:
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Stainless hlau screws siv yog SUS304. SUS202 lossis SUS201 kuj tseem siv hauv kev lag luam, nrog rau SUS410 (stainless hlau screws). Stainless hlau screws yog tsim los ntawm kev ntxuav tawm cov roj saum npoo thaum lub sij hawm tsim khoom thiab tsim cov yeeb yaj kiab tiv thaiv. Lub corrosion kuj ntawm stainless hlau screws txawv nyob ntawm seb cov khoom. Kev tiv thaiv rau nruab nrab ntsev tsuag ntawm SUS304 yog 48-96 teev. SUS202 kuj tseem tuaj yeem ua kom huv thiab passivated. Qhov kev tiv thaiv rau nruab nrab ntsev tsuag yog siab tshaj 48, thaum lub stainless hlau ntsia hlau SUS410 peb hu yog resistant rau nruab nrab ntsev rau txog 20 teev. Nws cov nqi yog siab dua li ntawm tag nrho cov ferrite thiab nto-kho screws, yog li nws yog qhov zoo tshaj plaws tsis siv stainless hlau tom qab. Hlau ntsia hlau.
