Electroplating yog txheej txheem electrochemical thiab txheej txheem redox. Cov txheej txheem yooj yim ntawm electroplating yog raus rau hauv ib qho kev daws ntawm hlau ntsev raws li cathode, thiab cov phaj hlau ua anode, tom qab DC fais fab mov, Plating deposits qhov yuav tsum tau ntawm ib feem.
Cov txheej txheem ntawm electroplating yog qhov tseem ceeb raws li hauv qab no:
Cov hlau plated yog nyob ntawm qhov anode thiab cov khoom yuav tsum tau plated yog nyob ntawm cathode.
Cov anode thiab cathode txuas nrog los ntawm cov tshuaj electrolyte uas muaj plated hlau zoo ions.
Tom qab dhau los ntawm DC fais fab mov, cov hlau ntawm lub anode yuav oxidize (poob electrons), thiab cov ions zoo nyob rau hauv cov tshuaj yuav raug txo kom tsawg (tau txais electrons) ntawm cathode los tsim atoms thiab sib sau rau ntawm lub cathode.
Cov tsos ntawm cov khoom plated tom qab electroplating muaj feem xyuam rau qhov loj ntawm qhov tam sim no. Qhov me me tam sim no, qhov zoo nkauj dua cov khoom yuav tsum tau plated; txwv tsis pub, ib qho tsis sib xws yuav tshwm sim.
Cov kev siv tseem ceeb ntawm electroplating muaj xws li tiv thaiv hlau oxidation (xws li xeb) thiab kho kom zoo nkauj.
Lub luag haujlwm ntawm electroplating:
1. Copper plating: siv los ua primer los txhim kho cov adhesion ntawm txheej plating thiab muaj peev xwm tiv thaiv corrosion.
2. Nickel plating: puag lossis zoo li, txhim kho corrosion kuj thiab hnav tsis kam, (qhov twg cov tshuaj nickel tiv taus ntau dua rau chrome hauv cov txheej txheem niaj hnub).
3. Kub plating: Txhim kho qhov kev tiv thaiv kev tiv thaiv thiab txhim kho cov teeb liab kis tau tus mob.
4. Palladium-plated npib tsib xee: Txhim kho qhov kev tiv thaiv kev sib cuag, txhim kho cov teeb liab kis tau tus mob, thiab hnav tsis kam siab dua kub.
5. Tin-plated txhuas: Txhim kho qhov vuam muaj peev xwm thiab hloov tau sai los ntawm lwm cov khoom hloov.
6. Silver plating: Txhim kho qhov kev sib cuag tiv thaiv thiab txhim kho cov teeb liab kis tau tus mob.
Electroplating yog ib txoj hauv kev tso ib txheej hlau ntawm tus neeg xyuas pib siv lub hauv paus ntsiab lus ntawm electrolysis. Ntxiv nrog rau cov khoom siv hluav taws xob, electroplating kuj tseem siv tau rau ntawm cov khoom siv tshwj xeeb kho.
Siv cov nickel plating ua piv txwv:
Thaum npib tsib xee plating, cathode yog ib feem yuav tsum tau plated, lub anode yog ib tug ntshiab npib tsib xee phaj, thiab cov nram qab no tshwm sim nyob rau hauv lub anode thiab cathode raws li nram no:
Cathode (plated): Ni2 plus plus 2e-→ Ni (cov tshuaj tiv thaiv tseem ceeb)
2H ntxiv rau 2e → H2↑ (sab cov tshuaj tiv thaiv)
Anode (nickel phaj): Ni -2e → Ni2 ntxiv (cov tshuaj tiv thaiv tseem ceeb)
4OH--4e-→2H2O ntxiv rau O2 (sab cov tshuaj tiv thaiv)
Tshiab insoluble electrode - titanium anode:
Lub titanium anode muaj lub zog electrochemical catalytic siab, thiab cov pa oxygen evolution overpotential yog li ntawm 0.5 V qis dua cov hlau lead alloy insoluble anode. Lub zog txuag tau zoo kawg li, kev ruaj ntseg yog siab, cov tshuaj plating tsis muaj kuab paug, qhov hnyav yog lub teeb, thiab hloov tau yooj yim.
Qhov zoo:
1. Cov pa oxygen evolution overpotential ntawm titanium anode kuj qis dua li ntawm platinized anode, tab sis lub neej yog nce ntau dua 1 zaug;
2. Nws tuaj yeem txo lub tank voltage thiab txuag hluav taws xob noj;
3. Titanium anode muaj kev ruaj ntseg zoo (tshuaj lom neeg, electrochemical) hauv cov txheej txheem electroplating thiab muaj lub neej ua haujlwm ntev.
Kev siv cov titanium electrodes hauv kev lag luam electroplating feem ntau xaiv cov coatings nrog tsawg hlau oxides, xws li tantalum coatings, tantalum coatings, thiab lwm yam.
Daim ntawv thov ntawm tsawg hlau oxide txheej titanium anode hauv electroplating
Qhov tsis tshua muaj hlau oxide txheej titanium anode yog ua los ntawm cov hlau zoo nkauj strontium ntsev coated ntawm titanium substrate thiab sintered ntawm qhov kub thiab txias thiab yog dav siv hauv kev lag luam hydrometallurgy xws li electroplating thiab electrolysis. Kev npaj thiab kev siv ntawm noble hlau oxide-coated titanium anodes yog heev paub tab. Qhov zoo ntawm xws li titanium anodes yog raws li nram no:
1. High tam sim no efficiency, zoo heev corrosion kuj, lub neej ntev anode, thiab siab ceev tam sim no.
2. Kev txuag hluav taws xob: cov hlau muaj txiaj ntsig zoo oxide txheej titanium anode yog cov pa oxygen evolution tsis tshua muaj hluav taws xob overpotential electrode, nws yooj yim dua los txheeb xyuas cov pa oxygen hauv thaj chaw oxygen evolution ntawm lub anode. Yog li ntawd, lub cell siab kuj tseem qis thaum lub sij hawm electrolysis, uas txuag lub zog.
3.Tsis muaj kuab paug: noble hlau oxide txheej Titanium anode txheej yog ceramic oxide ntawm noble hlau niobium, uas yog ib tug ncaj ncees oxide.
4. Tus nqi zoo: Yuav kom ua tiav tib lub neej kev pabcuam raws li cov platinized electrode, tus nqi ntawm cov hlau oxide txheej txheej titanium anode yog kwv yees li 80 feem pua ntawm cov platinized electrode.
5. Tus nqi tu qis: piv rau cov tshuaj soluble electrode ib txwm muaj, cov hlau oxide txheej txheej titanium anode tsis tas yuav hloov lub hnab anode nquag thiab rov plating lub anode, yog li cov khoom tsim tau zoo dua, cov nqi zog txo;
6. Nyob rau hauv tib txoj kev ua hauj lwm, lub neej ntawm noble hlau oxide-coated titanium anode nyob ntawm qhov ua hauj lwm tam sim no ceev, kub, thiab da dej muaj pes tsawg leeg.
Hu rau
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