Lub PTFE immersion rhaub, rub los ntawm ib lub tank hnyav phosphating, tuaj yeem tawm nrog tuab, ci-on crust ntawm grey hlau ntsev. Tab sis nyob rau hauv lub crust, lub hauv paus nto ntawm lub sheath nws tus kheej qhia ib zaj dab neeg. Ib lub hnab nrog lub microscopically ntxhib, matte tiav yuav muab ib lab me me thauj tog rau nkoj cov ntsiab lus rau thawj cov muaju ntawm nplai kom latch rau. Ib lub tsho nrog lub iav, polished tiav, los ntawm qhov sib txawv, muaj qhov tsawg dua footholds, thiab cov nplai, txawm tias tseem tsim, cov ntawv cog lus tsis muaj zog dua thiab yooj yim dua los yog ntxuav tawm. Qhov sib txawv ntawm qhov chaw tiav no tsis yog ib qho kev nthuav dav zoo nkauj xwb- nws yog ib qho kev txiav txim siab engineering hauv kev tawm tsam sludge adhesion.

Kev Tsim Khoom Keeb Kwm ntawm Nto Roughness

Qhov saum npoo roughness ntawm PTFE sheath yog qhov tshwm sim ncaj qha ntawm nws cov txheej txheem tsim khoom. Tus qauv PTFE raj yog tsim los ntawm paste extrusion ntawm nplua PTFE hmoov, ua raws li los ntawm sintering ntawm kub kub. Cov txheej txheem no ib txwm yields me ntsis ntxhib, matte nto, uas zoo kawg nkaus tsim nyog rau ntau daim ntawv thov cua sov. Lub microscopic toj thiab kwj ntawm lub sheath lub nto yog lub zais footholds qhov twg fouling pib nws nce. Txawm li cas los xij, rau cov kev pab cuam fouling hnyav tshaj plaws -xws li hauv phosphating da dej, electroplating yaug tso tsheb hlau luam, lossis kev kho dej khib nyiab hauv kev lag luam- cov chaw tsim khoom siv hluav taws xob zoo tshaj tuaj yeem muab 'polished' sheath. Qhov no yog ua tiav los ntawm cov txheej txheem thermal lossis mechanical smoothing, xws li nplaim taws polishing, mechanical burnishing, lossis kev kho tshwj xeeb tom qab sintering.

Yuav Ua Li Cas Nto Finish Influences Sludge Adhesion

Lub luag haujlwm ntawm Micro-Voids thiab Asperities

Lub polished PTFE sheath muaj qhov txo qis ntawm micro-voids, kab nrib pleb, thiab nto asperities. Nyob rau hauv kev xyaum, lub smoother nto txo ​​qhov chaw muaj nucleation rau scale-forming compounds (piv txwv li, calcium phosphate, hlau hydroxide, los yog hlau soaps) crystallize thiab adheres. Qhov tshwm sim yog qhov qis dua ntawm cov nplai tsim, ncua sij hawm ntev ntawm phau ntawv tu lub voj voog, thiab txo qhov kev pheej hmoo ntawm ib cheeb tsam, insulating kub qhov chaw tsim nyob rau hauv ib tug tuab sludge txheej. Ib qho chaw kub hauv zos tuaj yeem ua rau overheating ntawm PTFE, ua kom nws cov laus thiab muaj peev xwm ua rau lub plhaub tsis ua haujlwm.

Quantifying Nto Roughness

Qhov saum npoo roughness feem ntau ntsuas hauv Ra (arthmetical txhais tias roughness) hauv micrometers. Tus qauv PTFE sheath tej zaum yuav muaj tus nqi Ra nyob rau hauv thaj tsam ntawm 0.5-1.0 µm, uas xav tias me ntsis matte rau qhov kov. Los ntawm qhov sib piv, polished PTFE sheath tuaj yeem ua tiav Ra ​​hauv qab 0.2 µm, nce mus txog qhov ci, yuav luag ntub. Qhov kev txo qis ntawm ntau dua 60% hauv micro-roughness ua rau txo qis cov khoom siv sib cuam tshuam ntawm cov sludge thiab cov sheath.

Synergy nrog PTFE's Low Surface Energy

PTFE lub ntuj tsis tshua muaj zog (kwv yees li 18 mN / m) twb tiv thaiv adhesion zoo dua li feem ntau cov hlau los yog yas. Kev ua tiav zoo txhim kho cov cuab yeej no los ntawm kev tshem tawm cov chaw muaj zog siab (nruj npoo thiab cov pits microscopic) qhov twg van der Waals rog thiab cov hlab ntsha tuaj yeem tuav cov sludge ntau nruj. Kev sib xyaw ua ke ntawm cov tshuaj tsis muaj zog, tsis muaj zog polymer thiab polished nto tsim ib qho kev tiv thaiv tsis zoo tiv thaiv fouling.

CovPTFE rhaub sheath nto tiav sludge adhesionkev sib raug zoo yog li ntawd ncaj nraim: ib tug smoother tiav txhais tau hais tias tsawg dua nucleation cov ntsiab lus, tsis muaj zog daim ntawv cog lus, thiab yooj yim tu. Qhov no tsis yog qhov txiaj ntsig theoretical- nws tau raug lees paub nyob rau hauv kev sim ua ib sab ntawm qhov chaw uas polished sheaths yuav tsum muaj li 50% tsawg dua kev cuam tshuam los ntawm kev sib piv rau cov qauv matte sheaths hauv cov kev pabcuam zoo ib yam.

Cov txiaj ntsig zoo rau kev xaiv thiab kho lub rhaub

Lub smoother nto tsis yog kom zoo nkauj xwb; nws yog qhov ua haujlwm zoo, tiv thaiv fouling engineering uas them rau nws tus kheej hauv kev txo qis kev ua haujlwm thiab lub neej ntawm lub tshuab cua sov ntev dua. Thaum qhia txog lub tshuab cua sov PTFE rau ib daim ntawv thov sludge-prone, qhov saum npoo yuav tsum tau thov kom meej meej. Ntau lub tuam txhab muab kev xaiv "high-gloss" lossis "ultra-smooth" kev xaiv raws li kev hloov kho hwm. Tus nqi ntxiv yog feem ntau rov qab los nyob rau hauv thawj xyoo ntawm kev ua haujlwm los ntawm kev kaw tsawg dua rau kev tu thiab txo qis kev pheej hmoo ntawm kev ua tsis tiav ntxov vim muaj cua sov hauv zos.

Rau cov kev teeb tsa uas twb muaj lawm, cov ntaub ntawv ntxhib lossis matte tuaj yeem txhim kho ib nrab los ntawm kev ua tib zoo tu, tsis muaj abrasive. Txawm li cas los xij, thaum lub ntsej muag tau raug kho los ntawm cov hlau txhuam los yog scrapers, qhov roughness nce, ua rau yav tom ntej fouling tseem phem dua. Yog li ntawd, kev tu cov txheej txheem rau PTFE cov cua sov yuav tsum ib txwm siv cov sponges mos los yog cov tshuaj descalers uas tsis abraded nto.

Xaus: Yeej Kev Sib Tw Microscopic Tawm tsam Fouling

Lub polished PTFE sheath yog ib tug txhob txwm, premium-qib anti-fouling upgrade-ib qho yooj yim nto engineering tov uas tawm tsam cov relentless buildup ntawm sludge ntawm nws keeb kwm. Los ntawm kev txo tus naj npawb ntawm microscopic footholds, nws ua rau qeeb qhov pib ntawm qhov teev, ncua sij hawm ntxuav, thiab tiv thaiv lub tshuab cua sov los ntawm kev puas tsuaj kub. Kev ua tsov rog tawm tsam fouling yeej los yog poob ntawm qhov kev sib ntaus sib tua ntawm qhov chaw ntawm qhov chaw, thiab ib tug du, polished PTFE sheath muab tus neeg teb xov tooj qhov zoo dua.