Chloride Ions ua tus thawj Corrosion Trigger
Nyob rau hauv corrosion- tiv taus hluav taws xob cua sov raj ua los ntawm 316 stainless hlau, chloride ions sawv cev rau qhov tseem ceeb tshaj plaws ntawm ib puag ncig cuam tshuam rau lub sijhawm ntev -. Thaum 316 stainless hlau muaj molybdenum los txhim kho kev tiv thaiv chloride -induced nres, nws corrosion kuj tsis txwv.
Chloride concentration ncaj qha cuam tshuam rau kev ruaj ntseg ntawm passive chromium oxide zaj duab xis uas tiv thaiv cov hlau nto. Thaum cov tshuaj chloride ntau tshaj li ib qho kev pib, qhov tshwm sim ntawm cov tshuaj tiv thaiv hauv zos nce ntxiv.
Kev nkag siab txog cov tshuaj chloride concentration txwv yog qhov tseem ceeb rau kev nyab xeeb thiab txhim khu kev qha cua sov tsim.
Passive Film Stability nyob rau hauv chloride raug
Kev tiv thaiv corrosion ntawm 316 stainless hlau nyob ntawm qhov ruaj khov, tus kheej - kho cov txheej txheem passive. Hauv qhov chaw qis -chloride ib puag ncig, txheej txheej no tseem nyob tsis tu ncua thiab rov tsim dua tshiab yog tias muaj kev puas tsuaj me.
Txawm li cas los xij, thaum cov tshuaj chloride concentration nce, chloride ions nkag mus thiab ua kom tsis muaj zog ntawm cov yeeb yaj kiab. Lawv cuam tshuam nrog cov pa oxygen sib cuam tshuam ntawm cov hlau saum npoo thiab txhawb kev sib tsoo hauv zos.
Thaum cov zaj duab xis passive raug cuam tshuam, corrosion tuaj yeem pib ntawm cov ntsiab lus tshwj xeeb es tsis sib xws thoob plaws qhov chaw.
Kev tuav cov tshuaj chloride concentration nyob rau hauv cov kev txwv uas yuav tsum tau khaws cia passive zaj duab xis kev ncaj ncees.
Txoj Kev Cwj Pwm thiab Pitting Initiation
Corrosion cwj pwm hauv chloride- muaj ib puag ncig feem ntau ua raws li tus qauv pib. Hauv qab qee qhov chloride concentration, pitting tsis zoo li nyob rau hauv qhov kub thiab txias.
Tshaj li qhov pib no, qhov tshwm sim ntawm qhov pib pib nce zuj zus. Cov pits no tuaj yeem pib microscopically tab sis tuaj yeem nthuav tawm sab hauv, txo cov phab ntsa zoo.
Qhov tseeb chloride kam rau ua nyob ntawm qhov kub thiab txias, pH, yaj cov pa oxygen, thiab qhov chaw nyob. Qhov kub siab ua kom txo qis cov tshuaj chloride uas xav tau los ua rau pitting.
Nyob rau hauv cov cua sov immersion systems, chloride concentration tswj yuav tseem ceeb heev.
Kev sib cuam tshuam ntawm Kub thiab Chloride Level
Hluav taws xob cua sov raj ua haujlwm ntawm qhov kub siab saum npoo, uas ua rau cov tshuaj tiv thaiv electrochemical. Kev kub siab ua kom cov tshuaj chloride ion txav mus los thiab txo cov yeeb yaj kiab tsis zoo.
Rau 316 stainless hlau cua sov raj, chloride concentration uas muaj kev nyab xeeb nyob rau hauv chav tsev kub yuav ua nruj ua tsiv ntawm kev khiav hauj lwm kub.
Kev ntsuam xyuas tus qauv tsim yuav tsum xav txog qhov phem tshaj -cov ntaub ntawv thermal yam tsis yog cov dej tsis sib haum.
Lower surface watt density and controlled operating temperature reduce chloride-induced risk.
Kev cuam tshuam ntawm Crevice Corrosion
Chloride concentration tsis ua zoo ib yam nyob rau tag nrho cov cua kub tube nto. Hauv thaj chaw crevice xws li threaded fittings, flanges, thiab sealing interfaces, cov tshuaj chloride hauv zos yuav ua tau ntau dua li cov kua dej ntau.
Nyob ruaj khov micro-ib puag ncig tso cai rau chloride txuam nrog thiab oxygen depletion. Nyob rau hauv cov xwm txheej no, crevice corrosion yuav pib txawm tias tag nrho cov kab mob chloride zoo li nruab nrab.
Ua tib zoo tsim kho tshuab thiab tu tsis tu ncua txo qis hauv zos chloride buildup.
Kev cuam tshuam rau Welded Areas
Welded zones tuaj yeem pom qhov sib txawv me ntsis ntawm qhov sib txawv thiab cov kev ntxhov siab seem. Cov cheeb tsam no tuaj yeem nkag siab ntau dua rau chloride nres piv rau cov hlau puag.
Yog tias cov tshuaj chloride concentration mus txog qhov kev txwv ntawm cov khoom siv, cov cheeb tsam weld feem ntau dhau los ua thawj thaj chaw uas qhia pom tias muaj kev xeb.
Tom qab-weld nto kev kho mob thiab kev ua kom zoo passivation txhim kho kev tiv thaiv, tab sis kev tswj ib puag ncig tseem ceeb rau kev ruaj ntseg mus ntev -.
Long-Term Exposure and Cumulative Effect
Txawm hais tias cov tshuaj chloride concentration tseem me ntsis qis dua qhov tseem ceeb ntawm qhov pib, qhov ntev ntev ntawm kev ua haujlwm yuav maj mam txo qis cov txheej txheem tiv thaiv.
Rov ua dua cov cua sov ua ke nrog cov tshuaj lom neeg tuaj yeem maj mam ua kom muaj kev tiv thaiv corrosion.
Rau cov tshuab kev lag luam tas mus li, ntev - kev saib xyuas cov tshuaj chloride concentration muab kev ntseeg tau zoo dua li kev cia siab rau kev xaiv cov khoom siv thawj zaug xwb.
Cov tswv yim los tswj chloride Risk
Txo cov tshuaj chloride concentration hauv cov kua dej yog txoj kev txo qis tshaj plaws. Kev kho dej, dilution, lossis demineralization tuaj yeem txo qis qhov tshwm sim ntawm corrosion.
Nyob rau hauv rooj plaub uas cov tshuaj chloride tsis tuaj yeem txo qis, tswj qhov kub thiab txias, txo qhov kev tsim ntawm qhov crevice, thiab ua kom lub ntsej muag zoo ib yam dhau los ua qhov tseem ceeb tiv thaiv.
Kev tshuaj xyuas ib ntus rau thaum ntxov -theem pitting tso cai rau kev hloov pauv raws sijhawm ua ntej kev ua haujlwm ntawm kev ncaj ncees raug cuam tshuam.
Xaus
Chloride concentration threshold plays lub luag hauj lwm txiav txim siab corrosion ntawm 316 stainless hlau hluav taws xob cua sov raj. Thaum cov khoom siv muaj zog tiv taus piv rau cov qauv stainless hlau, cov tshuaj chloride ntau dhau ua ke nrog qhov kub siab tuaj yeem ua rau muaj kev cuam tshuam hauv zos.
Kev tsim qauv siv tau zoo yuav tsum tau ua tib zoo soj ntsuam cov qib chloride raws li kev ua haujlwm tiag tiag. Los ntawm kev tswj hwm ib puag ncig tsis zoo thiab tswj xyuas kev tsim khoom kom zoo, corrosion- tiv taus kev ua haujlwm ntawm 316 stainless hlau cua sov raj tuaj yeem siv tau rau hauv kev thov kev lag luam.
