Yuav ua li cas yog PTFE rhaub siv nyob rau hauv kub Chromic Acid Etching ntawm Plastics rau Electroless Plating?

Lub ci iab chrome trim ntawm lub tsheb grille pib raws li ib daim ntawm npub, txhaj tshuaj- molded ABS yas. Txhawm rau hloov qhov tsis yog -conductive substrate rau hauv qhov chaw muaj peev xwm lees txais cov hlau deposition, cov yas yog thawj zaug etched nyob rau hauv kub, muaj zog oxidizing chromic acid da dej. Qhov kev kho mob hnyav no tsim cov pits microscopic thiab kho cov chaw thauj tog rau nkoj rau ntawm cov khoom siv polymer, ua kom muaj zog adhesion ntawm cov txheej txheem catalytic thiab hlau. Lub immersion rhaub ua hauj lwm nyob rau hauv no heev corrosive ib puag ncig yuav tsum tiv taus tshuaj tej yam kev mob uas yuav sai sai ua puas feem ntau cov pa cua sov ntsiab.

Hauv cov ntsiab lus no, lubPTFE rhaub chromic acid etching yas platingdaim ntawv thov sawv cev rau kev siv tshuab tseem ceeb rau cov txheej txheem electroless plating niaj hnub.

Lub luag haujlwm ntawm Kub Chromic Acid hauv Yas Nto Ua Haujlwm

Tshuaj Etching Mechanism

Cov theem etching feem ntau yog siv sib xyaw ntawm chromic acid thiab sulfuric acid khaws cia ntawm qhov kub siab, feem ntau nyob rau hauv thaj tsam ntawm 60-70 degree. Ib hom kev lag luam uas muaj xws li:

400-500 g / L chromic acid (CrO₃ sib npaug)

200-400 g / L sulfuric acid (H₂SO₄)

Qhov sib tov no ua raws li lub zog muaj zog oxidizing uas xaiv tawm tsam cov polymer nto, tshwj xeeb yog ABS yas siv hauv tsheb thiab cov khoom siv.

Thaum raug:

Butadiene- cov theem nplua nuj yog nyiam oxidized

Microvoids thiab pits yog tsim rau ntawm qhov chaw

Cov pab pawg ua haujlwm tau qhia los txhim kho catalytic activation

Lub zog saum npoo yog nce ntxiv

Qhov tshwm sim yog tswj hwm micro-roughened morphology uas txhim kho hlau adhesion thaum electroless plating.

PTFE Rhaub Kev Ua Haujlwm hauv Oxidizing Acid Ib puag ncig

Chemical Resistance Zoo

Lub PTFE immersion rhaub yog tshwj xeeb haum rau qhov chaw no vim yog tshwj xeeb tshuaj inertness ntawm polytetrafluoroethylene. Cov khoom tseem nyob ruaj khov nyob rau hauv raug kub chromic thiab sulfuric acid sib tov uas yuav aggressively tua feem ntau hlau thiab ntau polymeric txheej.

Lub PTFE rhaub yog ib qho khoom siv hluav taws xob tsis sib haum xeeb, tsis muaj lub zog oxidizing hluav taws xob ntawm chromic acid uas yuav yaj cov khoom tsawg dua.

Tsis zoo li cov hlau -cov cua sov, PTFE tsis koom nrog cov tshuaj tiv thaiv redox hauv da dej, xyuas kom meej tias:

Tsis muaj tshuaj lom neeg hlau raug qhia

Da dej chemistry tseem ruaj khov

Etching kev ua tau zoo nyob ib puag ncig lub sijhawm

Thermal Stability thiab txheej txheem tswj

Kev tuav lub ntsuas kub ruaj khov hauv chav da dej yog qhov tseem ceeb rau kev ua tiav qhov ua kom zoo ib yam. Ech rate yog kub heev- nyob ntawm, thiab txawm tias qhov hloov pauv me me tuaj yeem cuam tshuam qhov adhesion zoo hauv cov kauj ruam hauv qab plating.

PTFE rhaub muab:

Ruaj khov thermal input ntawm cov tswj setpoints

Uniform tshav kub faib hauv da dej

Kev tiv thaiv rau thaj tsam corrosion kub qhov chaw

Lub neej ua haujlwm ntev nyob rau hauv kev raug tshuaj lom neeg tsis tu ncua

Nto huv thiab tu zoo

Tiv thaiv Sludge Adhesion

Thaum lub sij hawm chromic acid etching, degraded polymer fragments thiab chromium -raws li byproducts tsim ib tug ntom sludge uas yuav tso rau ntawm cov khoom nto.

PTFE muaj qhov zoo ntawm kev ua haujlwm zoo vim nws:

Tsawg zog nto

Tsis yog -stick yam ntxwv

Smooth, inert nto tiav

Qhov no txo ​​qis cov khoom seem ntawm cov khoom seem piv nrog cov khoom siv hlau ua kom sov, qhov chaw tso nyiaj tuaj yeem ua tau zoo thiab xav tau cov txheej txheem tu nruj heev.

Yooj yim ntxuav Cycles

Kev tu ncua sij hawm tseem yuav tsum tau tshem tawm cov chromium sludge. Txawm li cas los xij, PTFE nto tso cai rau:

Yooj yim yaug nrog dej los yog tshuaj ntxuav me me

Txo cov neeg kho tshuab scraping xav tau

Tsawg qhov kev pheej hmoo ntawm kev puas tsuaj saum npoo thaum kho

Lub sijhawm luv luv ntawm kev tu lub voj voog

Qhov no ua rau muaj kev txhim kho lub sijhawm da dej thiab ua haujlwm zoo ib yam.

Txheej Txheem Stability nyob rau hauv Electroless Plating Npaj

Qhov tseem ceeb ntawm Kev Tswj Etching

Uniform etching yog ib qho tseem ceeb rau downstream electroless plating adhesion. Kev hloov pauv ntawm qhov roughness tuaj yeem ua rau:

Tsis zoo catalytic activation

Localized plating delamination

Cov hlau tsis sib xws

Txo corrosion kuj ntawm cov khoom tiav

Kev ruaj khov thermal tej yam kev mob muab los ntawm PTFE cov cua sov pab tswj cov tshuaj tiv thaiv kinetics thoob plaws tag nrho cov ntim da dej.

Kev koom ua ke rau hauv Plating Kab Chemistry Control

The etching stage is part of a multi-step surface preparation process that includes:

Degreasing thiab ntxuav

Chromic acid etching

Neutralization

Catalytic activation

Electroless hlau deposition

Txhua theem nyob ntawm qhov dhau los, ua kom qhov kub thiab txias hauv chav da dej yog qhov yuav tsum tau ua rau tag nrho cov plating zoo.

Ceeb toom kev nyab xeeb

Chromic acid etching systems koom nrog hexavalent chromium tebchaw, uas yog cov tshuaj lom neeg, carcinogenic, thiab ua raws li kev cai nruj ib puag ncig thiab kev nyab xeeb kev ua haujlwm.

Cov kev cai tseem ceeb ntawm kev nyab xeeb muaj xws li:

Kaw lossis ventilated tank systems

Cov khoom siv tiv thaiv tus kheej (PPE)

Kev saib xyuas huab cua tsis tu ncua rau chromium pos huab

khib nyiab kho tshuab rau hexavalent chromium txo

Kev nruj nruj raws li kev txwv ib puag ncig

Kev tuav thiab pov tseg cov tshuaj chromic acid yuav tsum ua raws li kev tswj hwm kev lag luam tshuaj lom neeg cov qauv kev nyab xeeb.

Kev ntseeg tau ua haujlwm hauv Harsh Chemical Systems

Longevity nyob rau hauv tas mus li raug

PTFE heaters muab ncua kev pab cuam lub neej nyob rau hauv chromic acid ib puag ncig vim:

Ua kom muaj zog oxidizing cov neeg ua haujlwm

Chemical inertness ntawm siab kub

Tsis muaj catalytic cuam tshuam nrog da dej chemistry

Stable dielectric zog nyob rau hauv corrosive kua

Qhov kev ntseeg siab no yog qhov tseem ceeb tshwj xeeb hauv cov kab txuas txuas ntxiv uas tsis tau npaj tseg yuav cuam tshuam kev tsim khoom.

Xaus

Lub PTFE immersion rhaub ua hauj lwm raws li ib tug tshuaj tiv thaiv kab mob thiab thermally ruaj khov tivthaiv nyob rau hauv kub chromic acid etching systems siv rau yas nto npaj ua ntej electroless plating. Nws tiv thaiv kom muaj zog oxidizing acids, ua ke nrog cov yam ntxwv tsis yog - nplaum nplaum, ua kom muaj kev ntseeg siab hauv ib qho ntawm cov tshuaj phem tshaj plaws nyob rau hauv kev lag luam nto tiav.

Hauv lubPTFE rhaub chromic acid etching yas platingtxheej txheem, tswj cua sov kom zoo ib yam etch tus nqi, niaj hnub ua kom nto, thiab ruaj khov downstream plating kev ua tau zoo. Nyob rau tib lub sijhawm, PTFE's inert xwm tiv thaiv kev sib kis ntawm da dej thiab ua kom yooj yim txij nkawm los ntawm kev txo qis sludge adhesion.

Kev hloov pauv ntawm cov yas mus rau hauv metallized, zoo nkauj, los yog cov khoom siv ua haujlwm pib nyob rau hauv ib puag ncig tshuaj corrosive heev -ib qho uas yuav tsum tau muaj cov cua kub ruaj khov los ntawm cov khoom uas tseem tsis cuam tshuam tag nrho los ntawm kev siv tshuaj lom neeg.