Kev kho tshuaj lom neeg rau txhuas muaj xws li kev kho chromate, pleev xim, electroplating, anodizing, thiab electrophoresis. Cov txheej txheem kho tshuab suav nrog cov txheej txheem xws li txhuam hniav, polishing, sandblasting, thiab sib tsoo.
Ntu 1: Kev Kho Mob Chromate
Kev kho chromate tsim cov tshuaj hloov pauv txheej ntawm cov khoom nto, nrog lub thickness ntawm 0 5-4 micrometers. Cov txheej txheem hloov dua siab tshiab no muaj qhov zoo adhesion thiab feem ntau yog lub hauv paus txheej rau txheej txheej. Cov tsos mob tuaj yeem yog kub, aluminium-xim, lossis ntsuab. Hom txheej no muaj cov khoom siv hluav taws xob zoo, ua rau nws zoo tagnrho rau cov khoom siv hluav taws xob, xws li cov khoom siv hluav taws xob hauv cov xov tooj ntawm tes thiab cov khoom siv hluav taws xob. Nws yog tsim rau txhua yam khoom siv aluminium thiab aluminium alloy khoom. Txawm li cas los xij, cov txheej yog mos thiab tsis hnav-resistant, ua rau nws tsis haum rau cov khoom siv sab nraud.
Chromate Process Flow:Degreasing → Aluminium Acid Etching → Chromate Treatment → Ntim → Cia
Kev kho chromate yog tsim rau txhuas, aluminium alloys, magnesium, thiab magnesium alloys.
Kev Xav Tau Zoo:
Uniform xim thiab zoo txheej tsis muaj khawb lossis puas. Qhov saum npoo yuav tsum tsis txhob ntxhib lossis plua plav.
Txheej thickness yuav tsum yog 0 3-4 micrometers.
Ntu 2: Anodizing
Anodizing tsim ib txheej, ntom oxide txheej (Al2O3·6H2O, feem ntau hu ua corundum) ntawm cov khoom nto. Cov txheej no tuaj yeem ua tiav qhov hardness ntawm 200-300 HV, thiab cov khoom tshwj xeeb tuaj yeem dhau los ua cov anodizing nyuaj, mus txog qib hardness ntawm 400-1200 HV. Yog li ntawd, nyuaj anodizing yog ib qho tseem ceeb ntawm kev kho deg txheej txheem rau hydraulic cylinders thiab kis tau tus mob Cheebtsam.
Ntxiv mus, qhov kev kho mob no muab kev hnav zoo heev, ua rau nws xav tau rau aerospace thiab aviation cov khoom lag luam. Qhov sib txawv ntawm anodizing thiab nyuaj anodizing lies nyob rau hauv lub peev xwm los xim txheej anodized, nrog anodizing muab ntau zoo zoo nkauj xaiv.
Cov Txheej Txheem Feem Ntau:Cov txheej txheem anodizing muaj xws li txhuam matte ntuj xim, txhuam ci ntuj xim, txhuam ci xim, txhuam matte xim (tuaj yeem pleev xim rau txhua xim), polished ci ntuj xim, polished matte ntuj xim, polished ci xim, thiab polished matte xim. Tag nrho cov txheej no tuaj yeem siv rau hauv cov teeb pom kev zoo.
Anodizing txheej txheem Flow:Degreasing → Alkaline Etching → Chemical Polishing → Neutralization → Rinsing → Neutralization → Anodizing → Dyeing → Sealing → Kub Yaug → Drying
Cov Teeb Meem Zoo:A. Nto zoo li mottled, feem ntau yog vim cov hlau tsis zoo lossis cov khoom siv tsis zoo. Kev daws: rov kho dua lossis hloov cov khoom siv. B. Qhov saum npoo nthuav tawm cov xim zaj sawv, feem ntau vim yog qhov yuam kev thaum lub sijhawm anodizing. Kev daws: tshem tawm txheej thiab rov ua anodize. C. Kev khawb loj lossis abrasions ntawm qhov chaw feem ntau tshwm sim los ntawm kev thauj lossis kev ua haujlwm tsis tu ncua. Kev daws: tshem tawm txheej, zom, thiab rov ua anodize. D. Cov pob dawb tshwm sim thaum dyeing, feem ntau yog vim roj lossis impurities hauv dej thaum lub sijhawm anodizing.
Cov Qauv Zoo:
Txheej thickness ntawm 5-25 micrometers, hardness siab tshaj 200 HV, xim hloov tus nqi thaum lub sij hawm sealing xeem tsawg dua 5%.
Kev ntsuas ntsev ntsev ntau tshaj 36 teev, ua tau raws qib 9 CNS cov qauv.
Tsis muaj khawb, abrasions, lossis tsis muaj xim ntawm qhov chaw.
Nco tseg:Lub siab tuag-cam khwb cia txhuas (piv txwv li, A380, A365, A382) yuav tsum tsis txhob raug anodizing.
Tshooj 3: Electroplating ntawm Aluminium Khoom
Qhov zoo ntawm Aluminium thiab Aluminium Alloys:Aluminium thiab nws cov alloys muaj cov khoom siv hluav taws xob zoo, hloov hluav taws xob sai, tsis tshua muaj siab, thiab yooj yim ntawm shaping. Txawm li cas los xij, lawv kuj muaj qhov tsis zoo xws li tsis tshua muaj zog, tsis zoo hnav tsis kam, cuam tshuam rau intergranular corrosion, thiab nyuaj rau vuam, uas tuaj yeem txwv lawv cov ntawv thov. Txhawm rau kov yeej cov kev txwv no, kev lag luam niaj hnub siv electroplating.
Cov txiaj ntsig ntawm Aluminium Electroplating:
Txhim kho kev zoo nkauj.
Ua kom lub ntsej muag hardness thiab hnav tsis kam.
Txo kev sib txhuam coefficient thiab txhim kho lubricity.
Txhim kho qhov hluav taws xob conductivity.
Txhim kho corrosion kuj (nrog rau lwm yam hlau).
Yooj yim vuam.
Txhim kho kev sib raug zoo thaum lub sij hawm thermal nias nrog roj hmab.
Nce reflectivity.
Kho qhov ntev kam rau ua.
Vim yog txhuas lub siab reactivity, cov ntaub ntawv electroplated feem ntau yog ntau reactive dua txhuas nws tus kheej. Yog li, cov txheej txheem kev hloov pauv tshuaj xws li zinc immersion, zinc-hlau alloy, lossis zinc-nickel alloy yog tsim nyog los xyuas kom muaj kev sib raug zoo ntawm zinc lossis zinc alloy nruab nrab txheej thiab aluminium substrate. Lub siab tuag-cam khwb cia txhuas cov qauv yog ntxeem tau; Kev sib tsoo ntau dhau tuaj yeem ua rau cov pinholes, acid bubbling, lossis tev tawm.
Electroplating txheej txheem Flow:Degreasing → Alkaline Etching → Activation → Zinc Displacement → Activation → Electroplating (xws li npib tsib xee, zinc, tooj liab) → Chrome Plating lossis Passivation → Qhuav.
Kev Xav Tau Zoo:
Tsis muaj yellowing, pinholes, burrs, bubbling, khawb, los yog lwm yam tsis xws luag.
Txheej thickness saum toj no 15 micrometers, nrog rau kev ntsuam xyuas ntsev tsuag kav ntev li 48 teev, ua tau raws li tus qauv tub rog qib 9, thiab muaj peev xwm sib txawv ntawm 130-150 mV.
Bond zog yuav tsum dhau qhov kev xeem 60-degree dabtsi yog khoov.
Cov khoom lag luam rau ib puag ncig tshwj xeeb yuav xav tau kev hloov kho.
Ntu 4: Aluminium Txheej
Txheej txheej muaj xws li dipping, txau, dej nyab, dov, thiab txhuam, nrog rau dipping thiab txau yog cov tswv yim tseem ceeb. Dipping, los yog electrophoretic txheej, siv cov txheej txheem electrochemical los tso cov organic resin hais rau saum npoo, tsim cov pob tshab lossis xim xim organic. Ntawm cov no, cathodic electrophoresis, tsim nyob rau hauv 1970s, yog ib txoj hauv kev loj hauv kev lag luam txheej, paub txog nws zoo heev corrosion resistance, xim stability, thiab zoo adhesion.
Txheej txheej Flow:Mechanical Sib Tsoo → Degreasing → Tshem tawm Oxide Zaj duab xis → Chromate Treatment → Hmoov los yog Kua Txau → Ci → Kev Tshuaj Xyuas Kawg → Ntim → Cia.
Tshooj 5: Kev kho hluav taws xob ntawm Aluminium
Xim electrophoretic txheej yog txheej txheem kho qhov chaw tshiab uas siv cov txheej txheem electrochemical los tso cov organic resin colloidal hais mus rau cov khoom, tsim cov pob tshab lossis ntau cov xim organic. Raws li tus nqi ntawm cov khoom siv hauv cov xim electrophoretic, nws tuaj yeem muab faib ua anodic electrophoresis (nrog rau cov khoom tsis zoo) thiab cathodic electrophoresis (nrog rau cov khoom zoo).
Cov txheej txheej electrophoretic muaj kev tiv thaiv corrosion zoo heev (dhau 400 teev nyob rau hauv nruab nrab ntsev tshuaj tsuag), xim ruaj khov, thiab zoo adhesion rau lub hauv paus hlau, tso cai rau ntau yam txheej txheem. Cov txheej yog vibrant, thiab xim tuaj yeem kho raws li tus neeg siv yuav tsum tau ua, suav nrog kub, kas fes, phom, thiab dub. Piv nrog rau cov tshuaj pleev ib ce, electrophoretic coatings muab kev ua haujlwm zoo dua nrog kev cuam tshuam ib puag ncig.
Electrophoresis txheej txheem:
Electrophoresis:Qhov zoo them dej-soluble resin hais thiab lawv cov pigments adsorbed txav mus rau cathode.
Electrodeposition:Cov khoom zoo ntawm cov khoom siv tau ncav cuag qhov chaw ntawm lub workpiece (cathode) thiab tso tawm, tsim ib txheej insoluble, uas yog ci los ua ib zaj duab xis.
Dej Permeation:Moisture raug tshem tawm los ntawm cov txheej deposited; ib zaug cov dej noo poob mus rau 5%-15%, ci tuaj yeem pib.
Electrolysis dej:Direct tam sim no electrolyzes dej, tso hydrogen thiab oxygen. Electrolysis tuaj yeem txo qis permeability, cuam tshuam rau cov txheej txheej zoo li, txo qhov adhesion, thiab ua kom muaj zog noj; Yog li ntawd, txo cov dej electrolysis yog qhov tseem ceeb.
Tshooj 6: Kev faib tawm thiab xaiv cov txheej txheem txheej txheej
Los ntawm kev pom kev tiv thaiv corrosion, kev tsim kho saum npoo yuav tsum xav txog cov hauv qab no:
Cov hlau zoo nkauj (kub, platinum), stainless hlau nrog ntau dua 18% chromium, sib nqus alloys, thiab npib tsib xee-tooj liab alloys feem ntau tsis tas yuav muaj cov txheej txheem tiv thaiv ntxiv.
Cov khoom ua los ntawm cov pa roj carbon steel, cov hlau tsis tshua muaj hlau, thiab cov hlau cam khwb cia, uas ua rau atmospheric corrosion, yuav tsum muaj cov txheej txheem tiv thaiv.
Cov khoom ua los ntawm tooj liab thiab tooj liab alloys yuav xav tau cov kua qaub ntxuav, passivation, electroplating, los yog pleev xim rau kev tiv thaiv, thaum precision qhov chaw ua los ntawm phosphorus bronze los yog beryllium bronze yuav tsis xav tau kev kho deg.
Cov khoom ua los ntawm txhuas thiab txhuas alloys tuaj yeem siv anodizing thiab sealing kev kho mob. Cov khoom me me tsis haum rau anodizing tuaj yeem raug tshuaj oxidation. Cam khwb cia aluminium alloys tuaj yeem siv xim rau kev tiv thaiv.
Cov khoom ua los ntawm zinc alloys yuav raug phosphating, passivation, electroplating, los yog pleev xim rau kev tiv thaiv.