1. Lub Ntsiab Cai Tseem Ceeb: Rov Qab Electroplating
Electropolishing yog kev yaj electrochemical ntawm cov hlau workpiece hauv lub dab dej electrolyte kom tshem tawm cov khoom siv nto, txo qhov roughness, thiab tsim kom muaj qhov ci ntsa iab, passive tiav.
Xav txog nws li qhovqhov sib txawv ntawm electroplating:
● Kev siv hluav taws xob: Cov khoom ua haujlwm yog cathode ($-$) → Cov hlau ions los ntawm cov phaj kua rau ntawm qhov chaw.
● Kev txhuam hluav taws xob: Cov khoom ua haujlwm yog anode ($+$) → Cov hlau atoms raug oxidized thiab tshem tawm ntawm qhov chaw mus rau hauv cov kua.
2. Tus yuam sij rau kev ua kom du: Txheej ciam teb uas nplaum
Yog tias cov tshuaj anodic dissolution tsuas yog tshem tawm cov hlau xwb, nws tsuas yog yuav ua rau saum npoo ntawm cov hlau xwb. Nws ua li cas kom nws du? Cov lus teb nyob rau hauv cov txheej ciam teb viscous, ib lub tswv yim tseem ceeb rau kev tshawb fawb electropolishing.
● Kev Tsim: Thaum cov hlau ions yaj ntawm qhov anode, lawv sib sau ua ke hauv txheej nyias ntawm electrolyte uas nyob ib sab ntawm qhov chaw ua haujlwm.
● Kev Ntsuas Qhov Sib Npaug: Cov txheej no dhau los ua cov hlau ions uas muaj zog heev, ua rau nws cov viscosity thiab kev tiv thaiv hluav taws xob nce ntxiv.
● Cov Txheej Txheem Tswj Kev Nthuav Tawm: Qhov nrawm ntawm kev yaj tsis raug txwv los ntawm qhov hluav taws xob siv lossis kinetics ntawm cov tshuaj tiv thaiv, tab sis los ntawm qhov ceev npaum li cas cov hlau ions no tuaj yeem nthuav tawm ntawm qhov chaw mus rau hauv cov electrolyte loj.
3. Lub Caij Nyoog Tam Sim No Uas Txwv: Lub "Chaw Zoo Nkauj"
Rau electropolishing ua haujlwm, koj yuav tsum ua haujlwm hauv ib qho kev cai electrochemical tshwj xeeb: qhov txwv tam sim no plateau.
Hauv ib daim duab polarization (Current Density vs. Voltage), koj pom cov cheeb tsam sib txawv:
1. Thaj Chaw Ua Haujlwm (Qhov hluav taws xob tsawg): Tam sim no nce nrog lub zog hluav taws xob. Feem ntau, kev txiav tsis raug tswj tshwm sim. Qhov tshwm sim: Pitting thiab dull finish.
2. Thaj Chaw Passive / Plateau (Qhov hluav taws xob zoo tshaj plaws): Tam sim no tseem nyob ruaj khov txawm tias muaj hluav taws xob ntau ntxiv. Cov txheej nplaum nplaum tswj tau tag nrho kev sib kis. Qhov Tshwm Sim: Kev siv hluav taws xob zoo, ua kom du thiab ci ntsa iab.
3. Thaj Chaw Hloov Pauv (High voltage): Tam sim no rov qab nce siab dua. Kev hloov pauv ntawm cov pa oxygen thiab kev tawg hauv zos (pitting, gas streaking). Qhov tshwm sim: Kev txhuam ntau dhau, kev puas tsuaj.
Txoj cai ua haujlwm: Tswj lub cell voltage uas ua rau koj nyob ruaj khov ntawm lub tiaj tiaj.
4. Cov Txheej Txheem Ua Haujlwm & Cov Kev Phom Sij
Yuav kom ua tiav qhov "deep dive" hauv kev xyaum, tswj cov kev hloov pauv no:
● Kub: Ua rau kom muaj kev sib kis ntau ntxiv, ua rau cov txheej nplaum nyias. Yuav tsum tuav kom ruaj khov ($\pm 2^\circ C$). Kub dhau → etching. Txias dhau → xav tau hluav taws xob siab, streaking.
● Qhov Ceev Tam Sim NoFeem ntau 10–50 A/$dm^2$. Hais los ntawm qhov geometry ntawm ib feem. Qis dua rau cov khoom me me.
● Lub SijhawmFeem ntau siv sijhawm li 2–10 feeb. Yog siv sijhawm ntev dua tsis zoo dua; yog siv ntau dhau yuav ua rau cov hniav lwj.
● Tsim CathodeYuav tsum ua raws li cov qauv geometry nyuaj kom tswj tau qhov kev faib tawm tam sim no sib npaug. "Lub zog pov" tsis zoo.
Cov Teeb Meem Feem Ntau & Cov Hauv Paus Ua Rau Hluav Taws Xob:
· Gas Streaks: Kev kub hnyiab hauv zos lossis kev hloov pauv ntawm cov pa oxygen (cheeb tsam transpassive).
· Txiv kab ntxwv tev / PittingUa haujlwm hauv thaj chaw nquag (qhov hluav taws xob qis dhau) lossis cov electrolyte uas muaj kuab paug (piv txwv li, chlorides).
· Kev txhuam tsis sib xwsQhov chaw cathode tsis zoo lossis tsis txav cov electrolyte ntau txaus (uas tsis cuam tshuam cov txheej micro-viscous tab sis ua kom cov concentration ntau dua).
Cov Lus Qhia Tseem Ceeb: Kev Kawm Txog Electrochemical
Electropolishing yog ib qho txheej txheem anodic dissolution uas muaj kev txwv rau kev thauj mus los. Qhov tiav du tsis yog ua tiav los ntawm "hlawv tawm" cov ncov tab sis los ntawm kev tsim kom muaj ib txheej ciam teb ruaj khov, tiv taus viscous uas tsim kom muaj kev yaj ntau dua ntawm cov yam ntxwv ntawm qhov chaw tawm. Kev ua haujlwm raws li qhov chaw tam sim no txwv, nrog rau cov kua qaub electrolyte uas tau tsim tshwj xeeb, tsim kom muaj qhov chaw uas du, huv dua, thiab tsis muaj zog dua li lwm txoj hauv kev kho tshuab.
Lub sijhawm tshaj tawm: Plaub Hlis-09-2026