Deg mob raws li ib tug Hidden Corrosion Factor
Hauv corrosion- tiv taus hluav taws xob cua sov raj ua los ntawm 316 stainless hlau, alloy muaj pes tsawg leeg feem ntau yog qhov tseem ceeb. Txawm li cas los xij, deg roughness plays lub luag haujlwm tseem ceeb hauv kev txiav txim siab ntev - lub sij hawm corrosion.
Txawm tias thaum cov khoom siv raws li cov qauv tshuaj muaj pes tsawg leeg, qhov chaw ntxhib ntau dhau tuaj yeem ua rau muaj kev pheej hmoo corrosion, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj chloride - muaj cov tshuaj lom neeg los yog ib puag ncig hnyav.
Surface topography ncaj qha cuam tshuam rau cov zaj duab xis passive stability, deposit tsim, thiab localized electrochemical tshua.
Kev sib raug zoo ntawm Roughness thiab Passive Film Uniformity
Kev tiv thaiv corrosion ntawm 316 stainless hlau cia siab rau cov chromium zoo ib yam - nplua nuj oxide txheej. Ib tug smoother nto txhawb txawm passive zaj duab xis tsim thiab zoo ib yam ntawm cov pa oxygen.
Thaum roughness saum npoo yog siab, microscopic ncov thiab kwj ha tsim tsis sib xws passive zaj duab xis thickness. Valleys tej zaum yuav muaj cov pa oxygen depletion thiab dhau los ua qhov chaw ntawm cov yeeb yaj kiab txo qis.
Cov irregularities no tuaj yeem dhau los ua cov ntsiab lus pib rau hauv zos corrosion nyob rau hauv immersion tej yam kev mob.
Txo deg roughness txhim kho passive zaj duab xis txuas ntxiv thiab ntxiv dag zog rau corrosion.
Micro-Crevice Formation ntawm Rough Surfaces
Rough nto ib txwm muaj micro-indentations. Hauv daim ntawv thov ua kua dej, cov micro- cov qauv no tuaj yeem ntes cov kua dej thiab cov khoom tshem tawm.
Cov kua dej tsis tu ncua nyob rau hauv cov kev nyuaj siab microscopic no tuaj yeem ua rau cov tshuaj chloride concentration thiab oxygen depletion. Nyob rau tib lub sijhawm, qhov chaw no nyiam kev txhim kho crevice corrosion.
Txawm hais tias cov kua dej ntau tuaj yeem nyob hauv qhov txwv tsis pub muaj tshuaj lom neeg, micro- cov kab mob sib kis rau ntawm qhov chaw ntxhib tuaj yeem tsim kev ua phem hauv cheeb tsam kev tawm tsam.
Nto polishing txo cov micro-crevice tsim.
Kev cuam tshuam rau Pitting Corrosion Susceptibility
Pitting corrosion feem ntau pib ntawm qhov tsis xws luag lossis tsis zoo. Cov chaw ntxhib muab qhov chaw muaj peev xwm nucleation ntau dua piv rau kev ua tiav du.
Microscopic khawb, machining marks, thiab abrasions ua raws li cov ntsiab lus kev ntxhov siab. Nyob rau hauv ib puag ncig rhuab, qhov kub siab ua kom qhov pib pib hauv qhov chaw tsis muaj zog.
For 316 stainless steel heating tubes operating at high watt density, smoother surfaces reduce the likelihood of pit formation under chloride exposure.
Nto tiav qhov zoo ncaj qha cuam tshuam rau lub sijhawm ntev - kev ntseeg tau.
Qhov cuam tshuam rau kev tso nyiaj ntau ntxiv
Nyob rau hauv ntau lub tshuab cua sov immersion, ntxhia scaling, sediment, los yog biofilm yuav tsub zuj zuj ntawm lub sij hawm. Rough nto txhawb zog adhesion ntawm deposits piv rau polished nto.
Cov nyiaj tso cia tsim cov txheej txheem thermal rwb thaiv tsev uas ua rau qhov kub thiab txias hauv zos. Kev kub siab dua ua rau cov tshuaj tiv thaiv electrochemical thiab ua rau cov yeeb yaj kiab tsis muaj zog.
Tsis tas li ntawd, cov nyiaj tso cia tuaj yeem tsim cov crevice-zoo li cov xwm txheej hauv qab lawv cov qauv, txhawb kev txhim kho hauv zos.
Kev tuav lub ntsej muag du minimizes deposit retention thiab txhim kho tshav kub hloov efficiency.
Kev cuam tshuam ntawm Kev Tshaj Tawm Thaum tshav kub kub
Deg roughness kuj muaj feem xyuam rau cov yam ntxwv ntawm cov cua sov. Txawm hais tias me me roughness yuav ua rau me ntsis turbulence nyob rau hauv lub tshuab ntws, ntau irregularity yuav ua rau uneven kub faib.
Cov chaw kub hauv zos tuaj yeem tsim nyob rau hauv cov cheeb tsam uas cov deposits sau los yog cov kua dej stagnates. Qhov kub siab saum npoo yuav ua rau tus nqi corrosion hauv cov tshuaj chloride-muaj ib puag ncig.
Uniform nto finishing kom ruaj khov thermal kev ua tau zoo thiab txo corrosion acceleration.
Kev tsim khoom thiab kev txiav txim siab tiav
Nto roughness feem ntau txiav txim siab los ntawm kev tsim cov txheej txheem xws li kev kos duab, khoov, vuam, thiab polishing. Kev tuav tsis raug thaum lub sijhawm tsim khoom yuav ua rau muaj kev khawb lossis kis kab mob.
Tom qab-fabrication polishing thiab passivation kev kho mob txhim kho qhov sib xws ntawm qhov chaw thiab rov ua kom corrosion tsis kam tom qab kev siv tshuab.
Kev tswj hwm nruj ntawm cov txheej txheem ua tiav kom ntseeg tau tias qhov corrosion-cov khoom tiv taus ntawm 316 stainless hlau tsis raug cuam tshuam thaum tsim khoom.
Ntev -Nyob rau lub sij hawm tu ncua
Txawm hais tias thawj qhov chaw ua tiav yog qhov zoo, kev hnav ua haujlwm yuav maj mam nce roughness nyob rau lub sijhawm. Kev tu txhua yam nrog cov cuab yeej abrasive tuaj yeem ua rau tsis muaj kev puas tsuaj rau cov txheej txheem passive thiab ua rau muaj qhov tsis sib xws.
Kev siv tsis yog -txoj kev ntxuav abrasive pab tswj kom du thiab tsis muaj zog zaj duab xis.
Kev tshuaj xyuas tsis tu ncua ntawm qhov chaw ntawm qhov chaw txhawb kev saib xyuas kev saib xyuas thiab ncua kev pab cuam lub neej.
Xaus
Nto roughness ho cuam tshuam tus cwj pwm corrosion ntawm 316 stainless hlau hluav taws xob cua sov raj. Rough nto ua rau muaj kev cuam tshuam rau pitting, crevice corrosion, deposit tsub zuj zuj, thiab tsis sib xws passive zaj duab xis tsim.
Los ntawm kev tswj xyuas qhov chaw tiav thaum tsim khoom thiab txo qhov chaw puas tsuaj thaum lub sijhawm ua haujlwm, qhov kev tiv thaiv corrosion ntawm 316 stainless hlau tuaj yeem siv tag nrho.
Hauv kev xav tau ib puag ncig kev lag luam, qhov chaw du thiab kho kom zoo muab qhov txiaj ntsig tseem ceeb hauv kev ua kom lub sijhawm ntev - kev ntseeg tau thiab ruaj khov ntawm cov qauv.
