Qhov sib txawv tseem ceeb ntawm electropolishing thiab passivation yog tias electropolishing muab qhov ua tiav zoo tshaj plaws thiab tshem tawm cov xim tsis zoo uas passivation yuav tawm tom qab.
Electropolishing yog txheej txheem electrochemical uas tshem tawm cov khoom siv los ntawm cov hlau nplaum txhawm rau txo qhov roughness ntawm qhov chaw thaum passivation yog txheej txheem ntawm txheej txheej ntawm cov hlau txhawm rau txo cov tshuaj reactivity. Piv rau passivation, electropolishing thaum kawg tsim cov txiaj ntsig ntev. Qhov ntawd txhais tau tias; electropolishing ua rau lub tsho ntev ntev ntawm lub substrate.
Electropolishing yog dab tsi?
Electropolishing yog cov txheej txheem ntawm kev tshem tawm cov khoom los ntawm cov hlau nto kom txo tau qhov roughness. Peb tuaj yeem ua qhov no los ntawm qib micro-peaks thiab hav. Yog li, qhov txheej txheem no txhim kho qhov chaw tiav. Ntxiv mus, electropolishing yog pab tau rau polishing, passivation thiab deburring hlau qhov chaw. Nws feem ntau piav raws li qhov thim rov qab ntawm electroplating.
Daim duab 01: Txoj kev ntawm electropolishing (1. Electrolyte 2. Cathode 3. Work-piece to polish (Anode) 4. Particle txav ntawm lub workpiece mus rau cathode 5. Nto ua ntej polishing 6. Nto tom qab polishing)
Nyob rau hauv cov txheej txheem ntawm electropolishing, lub substrate (cov khoom uas yuav tsum tau electropolishing) yog immersed nyob rau hauv ib tug electrolyte raws li lub anode. Cov electrolyte yuav tsum yog chav da dej kub tswj. Txij li cov substrate no yog lub anode, nws txuas nrog qhov kawg ntawm DC fais fab mov. Lub cathode feem ntau yog stainless hlau, tooj liab lossis txhuas. Tsis tas li ntawd, tam sim no dhau los ntawm anode oxidizes cov hlau nyob rau saum npoo ntawm substrate thiab yaj cov hlau ions hauv cov da dej electrolytic. Tom qab ntawd, cov ions no ncav cuag lub cathode, thiab qhov txo qis tshwm sim. Yog li, qhov no yog li cas qhov roughness ntawm lub substrate yog txo nyob rau hauv electropolishing.
Nqe lus hauv qab no tham txog qhov zoo thiab qhov tsis zoo ntawm electropolishing:
Pros
- ua haujlwm yooj yim thiab zoo nkauj ua tiav
- Ua haujlwm hauv polishing irregularly-shaped khoom
- Siv tau rau cov kab mob tsis muaj menyuam
- Txhim kho corrosion kuj
- Tshem tawm cov txheej txheem oxide ib txwm los ntawm cov hlau; ex: TiO2 txheej ntawm Ti hlau
Cons
- Tsis tuaj yeem tshem tawm qhov tsis zoo heev
- Electropolishing multiphase alloys yuav ua rau roughening
Passivation yog dab tsi?
Passivation yog txheej txheem ntawm txheej txheej ntawm cov hlau txhawm rau txo cov tshuaj reactivity. Yog li ntawd, lub substrate uas undergoes passivation yog tsawg cuam tshuam los ntawm corrosion los ntawm ib puag ncig. Qhov tseeb, qhov chaw passivated tuaj yeem muaj sia nyob ntev ntev yam tsis muaj hlau leaching. Ntxiv mus, ib txheej passivation tuaj yeem yog cov organic lossis inorganic hauv qhov xwm txheej. Kev siv loj ntawm cov txheej txheem no yog kev kho dua tshiab ntawm kev tiv thaiv corrosion ntawm ib feem ntawm cov hlau tsis huv.
Daim duab 2: Passivated Fitting (txoj cai) vs Ib txwm haum (sab laug)
Tsis tas li ntawd, ob txoj hauv kev tseem ceeb ntawm kev ua haujlwm yog nitric acid passivation thiab citric acid passivation. Yav dhau los, nitric acid tau siv los passivate stainless hlau. Txawm li cas los xij, citric acid yog cov tshuaj uas peb tam sim no siv rau cov txheej txheem no vim nws muaj kev nyab xeeb thiab siv tau zoo dua.
Nqe lus hauv qab no tham txog qhov zoo thiab qhov tsis zoo ntawm ob qho tib si nitric acid passivation thiab citric acid passivation:
Pros and Cons of Nitric Acid Treatment Method
Pros: Tus nqi qis, xav tau sijhawm sib cuag tsawg, tib cov tshuaj nitric acid tuaj yeem siv tau ntau zaus, Cons: Kev phom sij ntawm nitric acid, tuaj yeem yaj cov hlau hnyav, uas yog tshuaj lom
Pros and Cons of Citric Acid Treatment Method
Pros: Tsis muaj teeb meem, yaj tsuas yog hlau (tsis yaj cov hlau hnyav), khaws cov hlau yaj tom qab nruab nrab, cov khoom siv biodegradable, thiab lwm yam.
Cons: kim, yog tias cov tshuaj muaj cov concentration tsawg, peb yuav tsum tau kub kom txog 80 ° C.
Qhov txawv ntawm Electropolishing thiab Passivation yog dab tsi?
Electropolishing yog kev tshem tawm cov khoom siv los ntawm cov hlau nto kom txo tau qhov roughness ntawm qhov chaw thaum passivation yog txheej txheem ntawm txheej txheej ntawm cov hlau kom txo tau cov tshuaj reactivity. Tsis tas li ntawd, qhov sib txawv tseem ceeb ntawm electropolishing thiab passivation yog tias electropolishing muab qhov ua tiav zoo tshaj plaws thiab tshem tawm cov xim tsis zoo, uas passivation yuav tawm tom qab.
Ntxiv mus, electropolishing feem ntau suav nrog immersing lub substrate raws li cov anode hauv cov tshuaj electrolytic thiab dhau DC tam sim no thaum cov txheej txheem passivation suav nrog cov kauj ruam xws li kev ntxuav alkaline, tshuaj tua kab mob (muaj zog oxidation), yaug, ziab thiab khaws cia. Ntxiv mus, lwm qhov sib txawv tseem ceeb ntawm electropolishing thiab passivation yog tias electropolishing feem ntau yog ua ntawm npib tsib xee, tin thiab lwm yam hlau alloys, whereas passivation feem ntau yog siv rau stainless hlau.
Cov hauv qab no infographic qhia txog qhov sib txawv ntawm electropolishing thiab passivation:
Summary – Electropolishing vs Passivation
Electropolishing yog txheej txheem electrochemical uas tshem tawm cov khoom siv los ntawm cov hlau nplaum txhawm rau txo qhov roughness ntawm qhov chaw thaum passivation yog txheej txheem ntawm txheej txheej ntawm cov hlau txhawm rau txo cov tshuaj reactivity. Hauv kev xaus, qhov sib txawv tseem ceeb ntawm electropolishing thiab passivation yog tias electropolishing muab qhov ua tiav zoo tshaj plaws thiab tshem tawm cov xim uas passivation yuav tawm tom qab.
