Ntsia hlau feem ntau siv cov txheej txheem kho deg oxidation, electrophoresis, electroplating, dacro plaub pawg, cov hauv qab no feem ntau yog rau kev kho deg ntawm cov ntsia hlau xim los qhia txog kev faib tawm.
Dub coated ntsia hlau
Cov ntsia hlau dub feem ntau yog siv los kho lub plhaub hauv qab lossis rov qab lub plhaub ntawm cov khoom siv dub lossis lwm yam khoom siv hluav taws xob tsaus, thiab cov ntsia hlau dub kuj tau siv hauv tshuab los txo cov kev tswj cov khoom siv. Nws lub ntsiab oxidation dub, dub nickel, zinc dub thiab electrophoresis dub thiab lwm yam txheej txheem.
1. Dub oxide:
Nws tau muab faib ua ib txwm kub blackening thiab kub kub blackening. Ua ib qho piv txwv kub kub blackening, cov txheej txheem ntws yog: tshuaj lom neeg tshem tawm - dej kub ntxuav - dej txias ntxuav - xeb tshem tawm acid etching - ntxuav - blackening - tu - roj los yog roj sealing. Nws yog oxide zaj duab xis tsim nyob rau hauv sodium hydroxide thiab sodium nitrite ntawm qhov kub ntawm ntau tshaj 100 degrees.
Cov khoom tseem ceeb ntawm oxide zaj duab xis yog ferric oxide (Fe3C4). Qhov nruab nrab ntawm cov zaj duab xis yog tsuas yog 0.6-1.5um, thiab cov corrosion kuj tsis zoo. Nyob rau hauv cov ntaub ntawv ntawm tsis muaj roj los yog sealing, lub nruab nrab ntsev tsuag tsuas yog hais txog 1-2 teev, thiab tom qab roj, nws yog li ntawm 3-4 teev. Cov khoom siv me me tsis siv cov txheej txheem no ntawm cov ntsia hlau. Nyob rau hauv cov nqe lus ntawm tsos xim, oxidized dub yog ze rau dub zinc thiab electrophoretic dub, tab sis tsis zoo li dub zinc thiab electrophoretic dub.
2.Electroplating:
Dub electroplating muaj ob hom dub zinc thiab dub npib tsib xee, nws cov txheej txheem hauv paus ntsiab lus yog tib yam, tsuas yog cov qauv ntawm cov tshuaj electroplating thiab tom qab kev kho mob nrog cov khib nyiab lossis cov kua passivation txawv. Cov khoom siv tshuaj lom neeg ntawm zinc yog nquag, yooj yim rau oxidize thiab tsaus ntuj nyob rau hauv qhov chaw, thiab thaum kawg tsim "dawb xeb" corrosion, galvanized tom qab chromate kev kho mob, thiaj li yuav npog ib txheej ntawm cov tshuaj hloov dua siab tshiab zaj duab xis ntawm zinc, kom cov active hlau yog Nyob rau hauv lub blunt xeev, yog 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.
(1) Dub zinc plating:
Electroplating txheej txheem yog: roj tshem tawm - tu - qaug zog acid etching - galvanizing - tu - passivation - tu - ziab - khib; Thaum kawg, cov khib nyiab feem ntau yog cov roj dub (ib hom xim), dej Tianthat, dej roj hmab raws li qhov sib piv ntawm qhov zoo, nws lub luag haujlwm tseem ceeb yog txhawm rau txhim kho cov ntsia hlau saum npoo dub uniformity thiab ci ntsa iab thiab txhim kho corrosion kuj ntawm cov ntsia hlau, Tom qab cov khib nyiab los tiv thaiv cov ntsev tsuag muaj peev xwm nyob hauv ntau tshaj 20, xws li roj corrosion kuj tuaj yeem txhim kho.
Qhov nruab nrab ntsev tsuag tshuaj ntsuam ntawm dub zinc screws tau siv sijhawm li 12 teev, thiab qib kev lag luam kuj tseem siab. Tsis muaj qhov tshwm sim tsis tsim nyog hauv kev sim niaj hnub. Los ntawm nws cov tsos, nws yog tsaus dua li dub npib tsib xee, thiab nyob ze rau oxidized dub thiab electrophoretic dub. Nws yog qhov txawv los ntawm kev sib tsoo ob peb zaug ntawm daim ntawv dawb kom pom cov xim dawb ntawm zinc.
(2) Dub npib tsib xee plating:
Electroplating txheej txheem: deoiling - tu - ua kom tsis muaj zog acid - tu - tooj liab plating hauv qab - ua kom - ntxuav - electroplating ntawm dub npib tsib xee - tu - passivation - tu - ziab - khib, dub nickel plating los ntawm dub nickel da dej, kwv yees li 40 feem pua { {13}} feem pua nickel, zinc 20 feem pua -30 feem pua, sulfur 10 feem pua -15 feem pua, organic teeb meem 10 feem pua.
Thaum lub sij hawm electroplating, cov sulfur nyob rau hauv thiocyanate ions hloov mus rau sulfur ions thiab yog ua ke nrog npib tsib xee los ua dub nickel sulfide. Nyob rau hauv cov txheej txheem ntawm ntau tooj liab plating hauv qab, cov nyhuv tseem ceeb yog yooj yim dua tom qab cov txheej txheem ntawm npib tsib xee plating thiab tuaj yeem txhim kho corrosion kuj ntawm cov ntsia hlau, lub thickness ntawm cov tooj liab hauv qab hauv 1 micron, xws li nce lub thickness ntawm tooj liab hauv qab. tuaj yeem txhim kho qhov kev tiv thaiv corrosion, tab sis qhov muaj pes tsawg leeg yuav nce raws li.
(3) Electrophoresis dub:
Lub colloidal hais ntawm cov organic resin tso rau ntawm qhov chaw los ntawm electrochemical txoj kev los tsim ntau yam xim ntawm cov organic txheej txheej. Cov electrophoresis dub yog siv ntau dua hauv kev lag luam, thiab cov txheej txheem dub yog coj los ua piv txwv: roj tshem tawm - ntxuav - phosphating - electrophoresis xim - ziab. Nws tuaj yeem muab faib ua anode electrophoresis (resin ionization rau hauv qhov tsis zoo ions) thiab cathode electrophoresis (resin electrophoresis rau hauv qhov zoo ions), piv nrog cov txheej txheem xim, kev tsim kho kev ua tau zoo, kev ua qias tuaj thiab kev puas tsuaj rau ib puag ncig yog txo, nws tsis kam mus rau nruab nrab. ntsev tsuag kev ua tau zoo hauv 300 teev lossis ntau dua, tus nqi thiab kev tiv thaiv corrosion zoo ib yam li cov txheej txheem Dacro.
Dawb coated ntsia hlau
Cov txheej txheem dawb yog siv los nthuav tawm ntau yam, feem ntau yog dawb npib tsib xee, zinc dawb thiab stainless hlau screws yam tsis muaj kev kho deg.
1.White zinc:
Cov txheej txheem electroplating yog: roj tshem tawm, ntxuav, tsis muaj zog acid ua kom, hluav taws xob galvanized, ntxuav - dawb passivation, ntxuav, ziab, nrog dub zinc sib txawv yog tsis txaus ntshai thiab passivation kua sib txawv, dawb passivation yog xim tsis muaj pob tshab ntawm zinc oxide zaj duab xis, yuav luag tsis muaj chromium, yog li qhov kev tiv thaiv corrosion kuj tsis zoo dub zinc, xiav zinc, xim zinc, txheej txheem kev lag luam hauv 6-12 teev, Cov chaw tsim khoom electroplating tuaj yeem ua tiav cov tshuaj tsw qab ntsev rau li 20 teev los ntawm kev txhim kho qhov sib piv. qhov tseeb ntawm passivation tov.
Vim qhov nruab nrab ntsev tsuag kev sim ntawm cov ntsia hlau nto kho cov txheej txheem ntawm zinc plating dawb, txheej txheej corrosion yog xim dawb, thiab qhov tshwm sim ntawm xeb liab yog li 40 teev, yog li qhov corrosion kuj ntawm zinc dawb yog zoo dua li dawb nickel. . Piv nrog cov npib tsib xee dawb, cov tsos ntawm zinc dawb yog tsaus dua, thiab zinc dawb yog cov xim ntawm zinc, uas yog xim dawb.
2.White npib tsib xee:
Cov txheej txheem electroplating yog: tshem tawm roj - tu - tsis muaj zog acid ua kom - ntxuav - tooj liab plating hauv qab - ua kom - ntxuav - npib tsib xee plating - tu - passivation - tu - ziab - los yog kaw, thiab cov txheej txheem dub nickel yog ib yam nkaus, feem ntau yog electroplating. tov formulation yog txawv, tsawg zinc sulfide thiab ntxiv.
Nickel yog nyiaj-dawb yellowish hlau. Txhawm rau kom pom qhov zoo dua, ntxiv cov nickel-plated brightener. 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 tau roj los yog kaw, xws li xav txog qhov cuam tshuam ntawm corrosion ntawm cov khoom yas hauv cov khoom yuav tsum yog lub hom phiaj ntawm kev tswj xyuas seb qhov roj.
3. Stainless hlau ntsia hlau:
Stainless hlau ntsia hlau rau SUS304 cov khoom, kev lag luam kuj tseem siv tau SUS202 lossis SUS201, thiab SUS410 (stainless hlau screws).
Stainless hlau ntsia hlau yog zus tau tej cov roj nto ntxuav tawm thiab tsim ib tug tiv thaiv zaj duab xis, nws corrosion kuj raws li cov ntaub ntawv sib txawv muaj ib co sib txawv, nws tsis kam mus rau nruab nrab ntsev tsuag SUS304 nyob rau hauv 48-96 teev, SUS202 zoo nto tu passivation tau kuj tseem tiv taus qhov nruab nrab ntsev tsuag ntau tshaj 48 teev, thiab peb hu rau stainless hlau ntsia hlau SUS410 anti-neutral ntsev nyob rau hauv li 20 teev, Nws tus nqi yog siab tshaj tag nrho cov ferrite thiab nto kho screws, yog li nws yog qhov zoo tshaj plaws tsis txhob siv stainless hlau screws. .
Screws plated nyob rau hauv lwm yam xim
Feem ntau tsuas yog siv hauv tshuab, feem ntau yog xiav zinc, ntsuab zinc, xim zinc, thiab dacro thiab lwm yam, xiav zinc thiab ntsuab zinc raws li kev xav tau sib txawv yog feem ntau siv rau sab nraud, xiav zinc kev lag luam yog siv ntau dua, ntsuab zinc tsawg dua.
1.Blue zinc, ntsuab zinc:
Cov txheej txheem yog roughly tib yam li dawb zinc, xiav zinc yog passivated zinc oxide zaj duab xis uas muaj 0.5-0.6mg/dm2 ntawm trivalent chromium. Green passivation tseem hu ua pentaacid passivation, tuaj yeem tau cov nyom ntsuab ntsuab, cov kua dej passivation muaj phosphate ions, cov roj nyom ntsuab zaj duab xis yog ua los ntawm chromate thiab phosphate compound, cov qauv yog complex tiv thaiv zaj duab xis.
Rau nws cov corrosion kuj, xiav zinc zoo dua li zinc zinc, thiab ntsuab zinc zoo dua xiav zinc. Cov xim ntawm xiav zinc yog me ntsis xiav thiab kuj nyob ze rau dawb zinc, uas yog dav siv nyob rau hauv kev lag luam. Nws kuj tseem tuaj yeem siv los ua lwm txoj kev ntsia hlau hauv cov khoom tsim.
2. Xim zinc:
Nyob rau hauv tus txheej txheem ntawm galvanizing, xim zinc yog kuj zoo corrosion kuj. Nws cov txheej txheem passivation yog: galvanized - tu - 2 feem pua -3 feem pua nitric acid lub teeb - tu - tsawg chromium xim passivation - tu - ci aging. Qhov kub ntawm passivation yog tsawg dhau, cov zaj duab xis tsim qeeb, xim yog lub teeb thiab zaj duab xis yog nyias. Qhov kub yog siab, zaj duab xis yog tuab thiab xoob, qhov txuas tsis ruaj khov. Nws yog qhov zoo tshaj kom nws nyob ib ncig ntawm 25 degrees kom ntseeg tau tias koj tau txais cov xim tib yam rau qee lub sijhawm.
Tom qab passivation, nws yuav tsum tau ci thiab hnub nyoog los txhim kho qhov adhesion thiab corrosion kuj ntawm zaj duab xis. Xim zinc plated screws nyob rau hauv qab ntawm kev tiv thaiv rau nruab nrab ntsev tsuag nyob rau hauv ntau tshaj 48 teev, kev tswj yuav ua tau ntau tshaj 100 teev.
3. Dacromet:
DACROME yog luv luv rau DACROMET, uas yog, daim ntawv zinc raws li chromium ntsev tiv thaiv txheej, tseem hu ua zinc-aluminium txheej. Cov txheej txheem yooj yim yog: degreasing - roj tshem tawm - txheej - preheating - sintering - txias. Cov txheej txheem feem ntau yuav muaj 2-4 zaug los ntawm txheej txheej kom txias, vim tias cov ntsia hlau nrog cov txheej txheej yog kom ncav cuag qee qhov tuab yuav tsum tau ua ob peb zaug.
Cov qauv yog nyob rau saum npoo ntawm cov hlau, coated nrog ib txheej ntawm dacrochrome tov (xws li muaj scaly zinc, txhuas [ nplai loj yog 0.1-0.2x10-15 micron]Cr03 thiab tshwj xeeb organic compounds ntawm siab dispersion tov aqueous tov), tom qab 300 degree tshav kub preservation thiab ci rau ib lub sij hawm, lub hexalent chromium nyob rau hauv dacrochrome tov yog txo kom trivalent chromium. Lub amorphous chromate compound (nCr03 mCr203) tau tsim.
Kev tiv thaiv corrosion ntawm nruab nrab ntsev yog zoo heev mus txog 300 teev, qhov tsis zoo yog cov txheej tsis sib xws, txoj hauj lwm nyias yog 5-10um, txoj hauj lwm tuab yog li 40um, nws yuav cuam tshuam rau qhov tob ntawm txoj kab uas hla, yog li qhov tshuab tapping screws thiab screws nrog me me txoj kab uas hla yog zoo heev tsis txhob siv Dacro txheej txheem raws li kev kho deg.
